C
SECTION C — CHEMISTRY; METALLURGY
 C

Note(s)

  1. In section C, the definitions of groups of chemical elements are as follows:

    Alkali metals: Li, Na, K, Rb, Cs, Fr

    Alkaline earth metals: Ca, Sr, Ba, Ra

    Lanthanides: elements with atomic numbers 57 to 71 inclusive

    Rare earths: Sc, Y, Lanthanides

    Actinides: elements with atomic numbers 89 to 103 inclusive

    Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W

    Halogens: F, Cl, Br, I, At

    Noble gases: He, Ne, Ar, Kr, Xe, Rn

    Platinum group: Os, Ir, Pt, Ru, Rh, Pd

    Noble metals: Ag, Au, Platinum group

    Light metals: alkali metals, alkaline earth metals, Be, Al, Mg

    Heavy metals: metals other than light metals

    Iron group: Fe, Co, Ni

    Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens

    Metals: elements other than non-metals

    Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards

  2. Section C covers :
    1. pure chemistry, which covers inorganic compounds, organic compounds, macromolecular compounds, and their methods of preparation;
    2. applied chemistry, which covers compositions containing the above compounds, such as: glass, ceramics, fertilisers, plastics compositions, paints, products of the petroleum industry. It also covers certain compositions on account of their having particular properties rendering them suitable for certain purposes, as in the case of explosives, dyestuffs, adhesives, lubricants, and detergents;
    3. certain marginal industries, such as the manufacture of coke and of solid or gaseous fuels, the production and refining of oils, fats and waxes, the fermentation industry (e.g., brewing and wine-making), the sugar industry;
    4. certain operations or treatments, which are either purely mechanical, e.g., the mechanical treatment of leather and skins, or partly mechanical, e.g., the treatment of water or the prevention of corrosion in general;
    5. metallurgy, ferrous or non-ferrous alloys.
  3. In all sections of the IPC, in the absence of an indication to the contrary, the Periodic System of chemical elements referred to is the one with 8 groups as represented in the table below. For example, group C07F 3/00 "Compounds containing elements of the 2nd Group of the Periodic System" refers to the elements of columns IIa and IIb. [2009.01]

    1. In the case of operations, treatments, products or articles having both a chemical and a non-chemical part or aspect, the general rule is that the chemical part or aspect is covered by section C.
    2. In some of these cases, the chemical part or aspect brings with it a non-chemical one, even though purely mechanical, because this latter aspect either is essential to the operation or treatment or constitutes an important element thereof. It has seemed, in fact, more logical not to dissociate the different parts or aspects of a coherent whole. This is the case for applied chemistry and for the industries, operations and treatments mentioned in Notes (1)(c), (d) and (e). For example, furnaces peculiar to the manufacture of glass are covered by class C03 and not by class F27.
    3. There are, however, some exceptions in which the mechanical (or non-chemical) aspect carries with it the chemical aspect, for example:
    4. In still other cases, the pure chemical aspect is covered by section C and the applied chemical aspect by another section, such as A, B or F, e.g., the use of a substance or composition for:
    5. When the chemical and mechanical aspects are so closely interlocked that a neat and simple division is not possible, or when certain mechanical processes follow as a natural or logical continuation of a chemical treatment, section C may cover, in addition to the chemical aspect, a part only of the mechanical aspect, e.g., after-treatment of artificial stone, covered by class C04. In this latter case, a note or a reference is usually given to make the position clear, even if sometimes the division is rather arbitrary.
  
CHEMISTRY
 C07
ORGANIC CHEMISTRY (such compounds as the oxides, sulfides, or oxysulfides of carbon, cyanogen, phosgene, hydrocyanic acid or salts thereof C01; products obtained from layered base-exchange silicates by ion-exchange with organic compounds such as ammonium, phosphonium or sulfonium compounds or by intercalation of organic compounds C01B 33/00; macromolecular compounds C08; dyes C09; fermentation products C12; fermentation or enzyme-using processes to synthesise a desired chemical compound or composition or to separate optical isomers from a racemic mixture C12P; production of organic compounds by electrolysis or electrophoresis C25B 3/00, C25B 7/00)  [2]
 C07

Note(s)

  1. In this class, the following term is used with the meaning indicated:
    • "preparation" covers purification, separation, stabilisation or use of additives, unless a separate place is provided therefor. [4]
  2. Biocidal, pest repellant, pest attractant or plant growth regulatory activity of compounds or preparations is further classified in subclass A01P[8]
  3. In subclasses C07C-C07K and within each of theses subclasses, in the absence of an indication to the contrary, and with the exception referred to below, a compound is classified in the last appropriate place. For example, 2-butyl-pyridine, which contains an acyclic chain and a heterocyclic ring, is classified only as a heterocyclic compound, in subclass C07D. In general, and in the absence of an indication to the contrary (such as groups C07C 59/00), the terms "acyclic" and "aliphatic" are used to describe compounds in which there is no ring; and, if a ring were present, the compound would be taken by the "last place" rule to a later group for cycloaliphatic or aromatic compounds, if such a group exists. Where a compound or an entire group of compounds exists in tautomeric forms, it is classified as though existing in the form which is classified last in the system, unless the other form is specifically mentioned earlier in the system.
  4. Chemical compounds and their preparation are classified in the groups for the type of compound prepared. The processes of preparation are also classified in the groups for the types of reaction employed, if of interest. General processes for the preparation of a class of compounds falling into more than one main group are classified in the groups for the processes employed, when such groups exist. The compounds prepared are also classified in the groups for the types of compound prepared, if of interest.
  5. In this class, in the absence of an indication to the contrary, the compounds containing carboxyl or thiocarboxyl groups are classified as the relevant carboxylic or thiocarboxylic acids, unless the "last place rule" (see Note (3), above) dictates otherwise; a carboxyl group being a carbon atom having three bonds, and no more than three, to hetero atoms, other than nitrogen atoms of nitro or nitroso groups, with at least one multiple bond to the same hetero atom and a thiocarboxyl group being a carboxyl group having at least one bond to a sulfur atom, e.g. amides or nitriles of carboxylic acids, are classified with the corresponding acids. [5]
  6. Salts of a compound, unless specifically provided for, are classified as that compound, e.g. aniline hydrochloride is classified as containing carbon, hydrogen and nitrogen only (in group C07C 211/00), sodium malonate is classified as malonic acid (in C07C 55/00), and a mercaptide is classified as the mercaptan. Metal chelates are dealt with in the same way. Similarly, metal alcoholates and metal phenates are classified in subclass C07C and not in subclass C07F, the alcoholates in group C07C 31/00 and the phenates as the corresponding phenols in group C07C 39/00. Salts, adducts or complexes formed between two or more organic compounds are classified according to all compounds forming the salts, adducts or complexes. [2]
 C07D
HETEROCYCLIC COMPOUNDS  [2]
 C07D

Note(s)

  1. This subclass does not cover compounds containing saccharide radicals (as defined in Note (3) following the title of subclass C07H), which are covered by subclass C07H.      [2]
  2. In this subclass, in compounds containing a hetero ring covered by group C07D 295/00 and at least one other hetero ring, the hetero ring covered by group C07D 295/00 is considered as an acyclic chain containing nitrogen atoms.      [3]
  3. In this subclass, the following terms or expressions are used with the meanings indicated:
    • "hetero ring" is a ring having at least one halogen, nitrogen, oxygen, sulfur, selenium or tellurium atom as a ring member;      [2]
    • "bridged" means the presence of at least one fusion other than ortho, peri or spiro;      [2]
    • two rings are "condensed" if they share at least one ring member, i.e. "spiro" and "bridged" are considered as condensed;      [2]
    • "condensed ring system" is a ring system in which all rings are condensed among themselves;      [2]
    • "number of relevant rings" in a condensed ring system equals the number of scissions necessary to convert the ring system into one acyclic chain;      [2]
    • "relevant rings" in a condensed ring system, i.e. the rings which taken together describe all the links between every atom of the ring system, are chosen according to the following criteria consecutively:
      1. lowest number of ring members;
      2. highest number of hetero atoms as ring members;
      3. lowest number of members shared with other rings;
      4. last place in the classification scheme.      [2]
  4. Attention is drawn to Note (3) after class C07, which defines the last place priority rule applied in the range of subclasses C07C-C07K and within these subclasses.      [8]
  5. Therapeutic activity of compounds is further classified in subclass A61P.      [7]
  6. In this subclass, in the absence of an indication to the contrary:
    1. compounds having only one hetero ring are classified in the last appropriate place in one of the groups C07D 203/00-C07D 347/00. The same applies for compounds having more hetero rings covered by the same main group, neither condensed among themselves nor condensed with a common carbocyclic ring system;      [2]
    2. compounds having two or more hetero rings covered by different main groups neither condensed among themselves nor condensed with a common carbocyclic ring system are classified in the last appropriate place in one of the groups C07D 401/00-C07D 421/00;      [2]
    3. compounds having two or more relevant hetero rings, covered by the same or by different main groups, which are condensed among themselves or condensed with a common carbocyclic ring system, are classified in the last appropriate place in one of the groups C07D 451/00-C07D 519/00.      [2]
  7. In this subclass:
    • where a compound may exist in tautomeric forms, it is classified as though existing in the form which is classified last in the system. Therefore, double bonds between ring members and non-ring members and double bonds between ring members themselves are considered equivalent in determining the degree of hydrogenation of the ring. Formulae are considered to be written in Kekule form;      [2]
    • hydrocarbon radicals containing a carbocyclic ring and an acyclic chain by which it is linked to the hetero ring and being substituted on both the carbocyclic ring and the acyclic chain by hetero atoms or by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, are classified according to the substituents on the acyclic chain. For example, the compound

      is classified in group C07D 233/00, and the compound

      is classified in group C07D 233/00, where X —NH2, —NHCOCH3, or —COOCH3[2]

 C07D
Subclass index
COMPOUNDS CONTAINING ONE HETERO RING
HAVING NITROGEN AS RING HETERO ATOM
only nitrogen atoms
one nitrogen atom
Polymethyleneimine 295/00
Preparation of lactams 201/00
three-membered ring 203/00
four-membered ring 205/00
five-membered ring 207/00, 209/00
six-membered ring 211/00, 213/00, 215/00, 217/00, 219/00, 221/00
seven-membered ring 223/00
Other compounds 225/00, 227/00
two nitrogen atoms
four-membered ring 229/00
five-membered ring 231/00, 233/00, 235/00
six-membered ring 237/00, 239/00, 241/00
Piperazine 295/00
seven-membered ring 243/00
Other compounds 245/00, 247/00
three nitrogen atoms
five-membered ring 249/00
six-membered ring 251/00, 253/00
Other compounds 255/00
four or more nitrogen atoms 257/00, 259/00
nitrogen and oxygen atoms
five-membered ring 261/00, 263/00, 271/00
six-membered ring 265/00, 273/00
morpholine 295/00
Other compounds 267/00, 269/00, 273/00
nitrogen and sulfur atoms
five-membered ring 275/00, 277/00, 285/00
six-membered ring 279/00, 285/00
Thiomorpholine 295/00
Other compounds 281/00, 283/00, 285/00
nitrogen, oxygen, and sulfur atoms 291/00
HAVING OXYGEN AS RING HETERO ATOM
only oxygen atoms
one oxygen atom
three-membered ring 301/00, 303/00
four-membered ring 305/00
five-membered ring 307/00
six-membered ring 309/00, 311/00
Other compounds 313/00, 315/00
two oxygen atoms
five-membered ring 317/00
six-membered ring 319/00
Other compounds 321/00
three or more oxygen atoms 323/00
Other compounds 325/00
oxygen and nitrogen atoms
five-membered ring 261/00, 263/00, 271/00
six-membered ring 265/00, 273/00
Morpholine 295/00
Other compounds 267/00, 269/00, 273/00
oxygen and sulfur atoms 327/00
oxygen, nitrogen and sulfur atoms 291/00
HAVING SULFUR AS RING HETERO ATOM
only sulfur atoms
one sulfur atom
five-membered ring 333/00
six-membered ring 335/00
Other compounds 331/00, 337/00
two or more sulfur atoms 339/00, 341/00
sulfur and nitrogen atoms
five-membered ring 275/00, 277/00, 285/00
six-membered ring 279/00, 285/00
Thiomorpholine 295/00
Other compounds 281/00, 283/00, 285/00
sulfur and oxygen atoms 327/00
sulfur, nitrogen, and oxygen atoms 291/00
HAVING SELENIUM OR TELLURIUM AS RING HETERO ATOM
only selenium or tellurium atoms 345/00
together with nitrogen atoms 293/00
together with oxygen atoms 329/00
together with sulfur atoms 343/00
HAVING HALOGEN AS RING HETERO ATOM 347/00
COMPOUNDS CONTAINING TWO OR MORE HETERO RINGS
IN THE SAME RING SYSTEM
HAVING NITROGEN AS RING HETERO ATOM
only nitrogen
at least one six-membered ring with one nitrogen atom 471/00
Tropane, granatane 451/00
Quinine, quinuclidine, isoquinuclidine 453/00
Emetine, berberine 455/00
Lysergic acid, ergot alkaloids 457/00
Yohimbine 459/00
Vincamine 461/00
Carbacephalosporins 463/00
Other compounds 487/00, 507/00, 513/00
Purine 473/00
Pteridine 475/00
Thienamycin 477/00
nitrogen and oxygen 491/00, 498/00, 507/00
Morphine 489/00
Oxapenicillins 503/00
Oxacephalosporins 505/00
nitrogen and sulfur 507/00, 513/00
Penicillins 499/00
Cephalosporins 501/00
nitrogen, oxygen, and sulfur 507/00, 515/00
HAVING OXYGEN AS RING HETERO ATOM
only oxygen 493/00
oxygen and nitrogen 491/00, 498/00, 507/00
Morphine 489/00
Oxapenicillins 503/00
Oxacephalosporins 505/00
oxygen and sulfur 497/00
oxygen, nitrogen, and sulfur 507/00, 515/00
HAVING SULFUR AS RING HETERO ATOM
only sulfur in a particular ring 495/00
sulfur and oxygen 497/00
sulfur, nitrogen, and oxygen 507/00, 515/00
HAVING SELENIUM, TELLURIUM, OR HALOGEN AS RING HETERO ATOM 517/00
IN DIFFERENT RING SYSTEMS, EACH CONTAINING ONLY ONE HETERO RING
HAVING NITROGEN AS RING HETERO ATOM
only nitrogen
at least one six-membered ring with one nitrogen atom 401/00
Other compounds 403/00
nitrogen and oxygen 405/00, 413/00
nitrogen and sulfur 417/00
thiamine 415/00
nitrogen, oxygen, and sulfur 419/00
HAVING OXYGEN AS RING HETERO ATOM
only oxygen 407/00
oxygen and nitrogen 405/00, 413/00
oxygen and sulfur 411/00
oxygen, nitrogen, and sulfur 419/00
HAVING SULFUR AS RING HETERO ATOM
only sulfur in a particular ring 409/00
sulfur and nitrogen 417/00
thiamine 415/00
sulfur and oxygen 411/00
sulfur, nitrogen, and oxygen 419/00
HAVING SELENIUM, TELLURIUM, OR HALOGEN AS RING HETERO ATOM 421/00
COMPOUNDS CONTAINING TWO OR MORE RING SYSTEMS, HAVING EACH TWO OR MORE HETERO RINGS 519/00
ALKALOIDS
Emetine 455/00
Ergot 457/00, 519/00
Granatanine 451/00
Morphine 489/00
Nicotine 401/00
Papaverine 217/00
Quinine 453/00
Strychnine 498/00
Tropane451/00
CEPHALOSPORIN 501/00
PENICILLIN 499/00
PTERIDINE 475/00
THIENAMYCIN 477/00
PURINE 473/00
THIAMINE 415/00
COMPOUNDS CONTAINING UNSPECIFIED HETERO RINGS 521/00
 C07D 201/00 - 
C07D 259/00
Heterocyclic compounds having only nitrogen as ring hetero atom  [2]
P:1070 C07D 201/00
Preparation, separation, purification, or stabilisation of unsubstituted lactams  [2]
P:1060 C07D 203/00
Heterocyclic compounds containing three-membered rings with one nitrogen atom as the only ring hetero atom  [2]
P:1050 C07D 205/00
Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom  [2]
P:1040 C07D 207/00
Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom  [2]
 C07D 207/00

Note(s)

Pyrrolidines having only hydrogen atoms attached to the ring carbon atoms are classified in group C07D 295/00.  [2]

P:1030 C07D 209/00
Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom  [2]
P:1010 C07D 211/00
Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings  [2]
 C07D 211/00

Note(s)

  1. In this group, the following term is used with the meaning indicated:
    • "hydrogenated" means having less than three double bonds between ring members or between ring members and non-ring members.  [2]
  2. Piperidines having only hydrogen atoms attached to ring carbon atoms are classified in group C07D 295/00.  [2]
P:1000 C07D 213/00
Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members  [2]
P:990 C07D 215/00
Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems  [2]
P:980 C07D 217/00
Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems  [2]
P:970 C07D 219/00
Heterocyclic compounds containing acridine or hydrogenated acridine ring systems  [2]
P:1020 C07D 221/00
Heterocyclic compounds containing six-membered rings having one nitrogen atom as the only ring hetero atom, not provided for by groups C07D 211/00-C07D 219/00  [2]
P:960 C07D 223/00
Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom  [2]
 C07D 223/00

Note(s)

Hexamethylene imines or 3-azabicyclo [3.2.2] nonanes, having only hydrogen atoms attached to the ring carbon atoms, are classified in group C07D 295/00.  [2]

P:950 C07D 225/00
Heterocyclic compounds containing rings of more than seven members having one nitrogen atom as the only ring hetero atom  [2]
 C07D 225/00

Note(s)

Polymethyleneimines with at least five ring members and having only hydrogen atoms attached to the ring carbon atoms are classified in group C07D 295/00.  [3]

P:940 C07D 227/00
Heterocyclic compounds containing rings having one nitrogen atom as the only ring hetero atom, according to more than one of groups C07D 203/00-C07D 225/00  [2]
 C07D 227/00

Note(s)

Polymethyleneimines with at least five ring members and having only hydrogen atoms attached to the ring carbon atoms are classified in group C07D 295/00.  [3]

P:930 C07D 229/00
Heterocyclic compounds containing rings of less than five members having two nitrogen atoms as the only ring hetero atoms  [2]
P:920 C07D 231/00
Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings  [2]
P:910 C07D 233/00
Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings  [2]
P:900 C07D 235/00
Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings  [2]
P:890 C07D 237/00
Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings  [2]
P:880 C07D 239/00
Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings  [2]
P:870 C07D 241/00
Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings  [2]
 C07D 241/00

Note(s)

Piperazines with only hydrogen atoms directly attached to ring carbon atoms are classified in group C07D 295/00.  [2]

P:860 C07D 243/00
Heterocyclic compounds containing seven-membered rings having two nitrogen atoms as the only ring hetero atoms  [2]
P:850 C07D 245/00
Heterocyclic compounds containing rings of more than seven members having two nitrogen atoms as the only ring hetero atoms  [2]
P:840 C07D 247/00
Heterocyclic compounds containing rings having two nitrogen atoms as the only ring hetero atoms, according to more than one of groups C07D 229/00-C07D 245/00  [2]
P:820 C07D 249/00
Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms  [2]
P:800 C07D 251/00
Heterocyclic compounds containing 1,3,5-triazine rings  [2]
P:810 C07D 253/00
Heterocyclic compounds containing six-membered rings having three nitrogen atoms as the only ring hetero atoms, not provided for by group C07D 251/00  [2]
P:830 C07D 255/00
Heterocyclic compounds containing rings having three nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D 249/00-C07D 253/00  [2]
P:790 C07D 257/00
Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms  [2]
P:780 C07D 259/00
Heterocyclic compounds containing rings having more than four nitrogen atoms as the only ring hetero atoms  [2]
 C07D 261/00 - 
C07D 273/00
Heterocyclic compounds having nitrogen and oxygen as the only ring hetero atoms  [2]
P:760 C07D 261/00
Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings  [2]
P:750 C07D 263/00
Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings  [2]
P:740 C07D 265/00
Heterocyclic compounds containing six-membered rings having one nitrogen atom and one oxygen atom as the only ring hetero atoms  [2]
 C07D 265/00

Note(s)

Morpholines having only hydrogen atoms attached to the ring carbon atoms are classified in group C07D 295/00.  [2]

P:730 C07D 267/00
Heterocyclic compounds containing rings of more than six members having one nitrogen atom and one oxygen atom as the only ring hetero atoms  [2]
P:720 C07D 269/00
Heterocyclic compounds containing rings having one nitrogen atom and one oxygen atom as the only ring hetero atoms according to more than one of groups C07D 261/00-C07D 267/00  [2]
P:710 C07D 271/00
Heterocyclic compounds containing five-membered rings having two nitrogen atoms and one oxygen atom as the only ring hetero atoms  [2]
P:770 C07D 273/00
Heterocyclic compounds containing rings having nitrogen and oxygen atoms as the only ring hetero atoms, not provided for by groups C07D 261/00-C07D 271/00  [2]
 C07D 275/00 - 
C07D 285/00
Heterocyclic compounds having nitrogen and sulfur as the only ring hetero atoms  [2]
P:690 C07D 275/00
Heterocyclic compounds containing 1, 2-thiazole or hydrogenated 1,2-thiazole rings  [2]
P:680 C07D 277/00
Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings  [2]
P:670 C07D 279/00
Heterocyclic compounds containing six-membered rings having one nitrogen atom and one sulfur atom as the only ring hetero atoms  [2]
 C07D 279/00

Note(s)

Thiomorpholines having only hydrogen atoms attached to the ring carbon atoms are classified in group C07D 295/00.  [2]

P:660 C07D 281/00
Heterocyclic compounds containing rings of more than six members having one nitrogen atom and one sulfur atom as the only ring hetero atoms  [2]
P:650 C07D 283/00
Heterocyclic compounds containing rings having one nitrogen atom and one sulfur atom as the only ring hetero atoms, according to more than one of groups C07D 275/00-C07D 281/00  [2]
P:700 C07D 285/00
Heterocyclic compounds containing rings having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by groups C07D 275/00-C07D 283/00  [2]
P:640 C07D 291/00
Heterocyclic compounds containing rings having nitrogen, oxygen and sulfur atoms as the only ring hetero atoms  [2]
P:630 C07D 293/00
Heterocyclic compounds containing rings having nitrogen and selenium or nitrogen and tellurium, with or without oxygen or sulfur atoms, as the ring hetero atoms  [2]
P:620 C07D 295/00
Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms  [2]
 C07D 301/00 - 
C07D 329/00
Heterocyclic compounds having oxygen atoms, with or without sulfur, selenium, or tellurium atoms, as ring hetero atoms  [2]
P:610 C07D 301/00
Preparation of oxiranes  [2]
P:600 C07D 303/00
Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom  [2]
P:590 C07D 305/00
Heterocyclic compounds containing four-membered rings having one oxygen atom as the only ring hetero atoms  [2]
P:580 C07D 307/00
Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom  [2]
P:570 C07D 309/00
Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings  [2]
P:560 C07D 311/00
Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings  [2]
P:550 C07D 313/00
Heterocyclic compounds containing rings of more than six members having one oxygen atom as the only ring hetero atom  [2]
P:540 C07D 315/00
Heterocyclic compounds containing rings having one oxygen atom as the only ring hetero atom according to more than one of groups C07D 303/00-C07D 313/00  [2]
P:520 C07D 317/00
Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms  [2]
P:510 C07D 319/00
Heterocyclic compounds containing six-membered rings having two oxygen atoms as the only ring hetero atoms  [2]
P:530 C07D 321/00
Heterocyclic compounds containing rings having two oxygen atoms as the only ring hetero atoms, not provided for by groups C07D 317/00-C07D 319/00  [2]
P:500 C07D 323/00
Heterocyclic compounds containing more than two oxygen atoms as the only ring hetero atoms  [2]
P:490 C07D 325/00
Heterocyclic compounds containing rings having oxygen as the only ring hetero atom according to more than one of groups C07D 303/00-C07D 323/00  [2]
P:480 C07D 327/00
Heterocyclic compounds containing rings having oxygen and sulfur atoms as the only ring hetero atoms  [2]
P:470 C07D 329/00
Heterocyclic compounds containing rings having oxygen and selenium or oxygen and tellurium atoms as the only ring hetero atoms  [2]
 C07D 331/00 - 
C07D 345/00
Heterocyclic compounds having sulfur, selenium, or tellurium atoms as the only ring hetero atoms  [2]
P:460 C07D 331/00
Heterocyclic compounds containing rings of less than five members, having one sulfur atom as the only ring hetero atom  [2]
P:450 C07D 333/00
Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom  [2]
P:440 C07D 335/00
Heterocyclic compounds containing six-membered rings having one sulfur atom as the only ring hetero atom  [2]
P:430 C07D 337/00
Heterocyclic compounds containing rings of more than six members having one sulfur atom as the only ring hetero atom  [2]
P:420 C07D 339/00
Heterocyclic compounds containing rings having two sulfur atoms as the only ring hetero atoms  [2]
P:410 C07D 341/00
Heterocyclic compounds containing rings having three or more sulfur atoms as the only ring hetero atoms  [2]
P:400 C07D 343/00
Heterocyclic compounds containing rings having sulfur and selenium or sulfur and tellurium atoms as the only ring hetero atoms  [2]
P:390 C07D 345/00
Heterocyclic compounds containing rings having selenium or tellurium atoms as the only ring hetero atoms  [2]
P:380 C07D 347/00
Heterocyclic compounds containing rings having halogen atoms as ring hetero atoms  [2]
 C07D 401/00 - 
C07D 421/00
Heterocyclic compounds containing two or more hetero rings  [2]
 C07D 401/00 - 
C07D 421/00

Note(s)

Groups C07D 401/00-C07D 421/00 cover compounds containing two or more relevant hetero rings at least two of which are covered by different main groups of groups C07D 203/00-C07D 347/00, neither condensed among themselves nor condensed with a common carbocyclic ring or ring system.  [2]

P:360 C07D 401/00
Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom  [2]
P:370 C07D 403/00
Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D 401/00  [2]
P:340 C07D 405/00
Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom  [2]
P:350 C07D 407/00
Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D 405/00  [2]
P:330 C07D 409/00
Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms  [2]
P:320 C07D 411/00
Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen and sulfur atoms as the only ring hetero atoms  [2]
P:310 C07D 413/00
Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms  [2]
P:290 C07D 415/00
Heterocyclic compounds containing the thiamine skeleton  [2]
P:300 C07D 417/00
Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D 415/00  [2]
P:280 C07D 419/00
Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen, oxygen, and sulfur atoms as the only ring hetero atoms  [2]
P:270 C07D 421/00
Heterocyclic compounds containing two or more hetero rings, at least one ring having selenium, tellurium, or halogen atoms as ring hetero atoms  [2]
 C07D 451/00 - 
C07D 519/00
Heterocyclic compounds containing condensed hetero ring systems  [2]
 C07D 451/00 - 
C07D 519/00

Note(s)

  1. Groups C07D 451/00-C07D 517/00 cover compounds containing one system of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring system, with or without other non-condensed hetero rings.  [2]
  2. For the purpose of classification in groups C07D 451/00-C07D 519/00, the degree of hydrogenation of the ring system is not taken into consideration.  [2]
  3. For the purpose of classification in groups C07D 451/00-C07D 463/00, C07D 473/00-C07D 477/00, C07D 489/00, C07D 499/00-C07D 507/00, the wording of the groups has to be understood, in the absence of an indication to the contrary, as including ring systems further condensed with carbocyclic rings or ring systems, but excluding ring systems further condensed with other hetero rings, either directly or through a common carbocyclic ring system, e.g. sparteine is classified in group C07D 471/00, not in group C07D 455/00.  [3,5]
  4. In groups C07D 471/00, C07D 487/00, C07D 491/00-C07D 498/00 or C07D 513/00-C07D 517/00, the subdivision is based on the number of relevant hetero rings.  [3]
P:230 C07D 451/00
Heterocyclic compounds containing 8-azabicyclo [3.2.1] octane, 9-azabicyclo [3.3.1] nonane, or 3-oxa-9-azatricyclo [3.3.1.02,4] nonane ring systems, e.g. tropane or granatane alkaloids, scopolamine; Cyclic acetals thereof  [2]
P:210 C07D 453/00
Heterocyclic compounds containing quinuclidine or iso-quinuclidine ring systems, e.g. quinine alkaloids  [2]
P:200 C07D 455/00
Heterocyclic compounds containing quinolizine ring systems, e.g. emetine alkaloids, protoberberine; Alkylenedioxy derivatives of dibenzo [a, g] quinolizines, e.g. berberine  [2]
P:190 C07D 457/00
Heterocyclic compounds containing indolo [4, 3-f, g] quinoline ring systems, e.g. derivatives of ergoline, of the formula: , e.g. lysergic acid (compounds of the cyclic peptide type derived from ergotamane C07D 519/00)  [2]
 C07D 457/00

Note(s)

The numbering may be different according to the RING INDEX and given by the formula: .   [5]

P:180 C07D 459/00
Heterocyclic compounds containing benz [g] indolo [2, 3-a] quinolizine ring systems, e.g. yohimbine; 16, 18-lactones thereof, e.g. reserpic acid lactone  [2]
P:170 C07D 461/00
Heterocyclic compounds containing indolo [3, 2, 1-d, e] pyrido [3, 2, 1-i, j] [1, 5]-naphthyridine ring systems, e.g. vincamine (dimeric indolo alkaloids C07D 519/00)  [3]
P:130 C07D 463/00
Heterocyclic compounds containing 1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula: , e.g. carbacephalosporins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring  [5]
P:260 C07D 471/00
Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D 451/00-C07D 463/00  [2,5]
P:120 C07D 473/00
Heterocyclic compounds containing purine ring systems  [2]
P:110 C07D 475/00
Heterocyclic compounds containing pteridine ring systems  [2]
P:100 C07D 477/00
Heterocyclic compounds containing 1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula: , e.g. carbapenicillins, thienamycins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring  [5]
P:250 C07D 487/00
Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D 451/00-C07D 477/00  [2,5]
P:90 C07D 489/00
Heterocyclic compounds containing 4aH-8, 9 c- Iminoethano-phenanthro [4, 5-b, c, d] furan ring systems, e.g. derivatives of [4, 5-epoxy]-morphinan of the formula:   [2]
 C07D 489/00

Note(s)

The numbering may be different according to the RING INDEX and given by the formula: .   [5]

P:240 C07D 491/00
Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D 451/00-C07D 459/00, C07D 463/00, C07D 477/00 or C07D 489/00  [2]
P:80 C07D 493/00
Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system  [2]
P:70 C07D 495/00
Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms  [2]
P:60 C07D 497/00
Heterocyclic compounds containing in the condensed system at least one hetero ring having oxygen and sulfur atoms as the only ring hetero atoms  [2]
P:50 C07D 498/00
Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms (4-oxa-1-azabicyclo [3.2.0] heptanes, e.g. oxapenicillins C07D 503/00; 5-oxa-1-azabicyclo [4.2.0] octanes, e.g. oxacephalosporins C07D 505/00; analogues thereof having ring oxygen atoms in other position C07D 507/00)  [2,6]
P:40 C07D 499/00
Heterocyclic compounds containing 4-thia-1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula: , e.g. penicillins, penems; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring  [2]
P:30 C07D 501/00
Heterocyclic compounds containing 5-thia-1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula: , e.g. cephalosporins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring  [2]
P:20 C07D 503/00
Heterocyclic compounds containing 4-oxa-1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula: , e.g. oxapenicillins, clavulanic acid derivatives; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring  [6]
P:10 C07D 505/00
Heterocyclic compounds containing 5-oxa-1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula: , e.g. oxacephalosporins; Such ring systems being further condensed, e.g. 2,3-condensed with an oxygen-, nitrogen- or sulfur-containing hetero ring  [6]
P:140 C07D 507/00
Heterocyclic compounds containing a condensed beta-lactam ring system, not provided for by groups C07D 463/00, C07D 477/00 or C07D 499/00-C07D 505/00; Such ring systems being further condensed  [6]
P:160 C07D 513/00
Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D 463/00, C07D 477/00 or C07D 499/00-C07D 507/00  [2,6]
P:150 C07D 515/00
Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen, oxygen, and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D 463/00, C07D 477/00 or C07D 499/00-C07D 507/00  [2]
P:0 C07D 517/00
Heterocyclic compounds containing in the condensed system at least one hetero ring having selenium, tellurium, or halogen atoms as ring hetero atoms  [2]
P:220 C07D 519/00
Heterocyclic compounds containing more than one system of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring system not provided for in groups C07D 453/00 or C07D 455/00  [2]
P:1080 C07D 521/00
Heterocyclic compounds containing unspecified hetero rings  [2]
 C07D 521/00

Note(s)

This group is only used for the classification of heterocyclic compounds the chemical structure of which are not specified, i.e. only in those cases where the heterocyclic compounds cannot be classified in any of groups C07D 201/00-C07D 519/00[2009.01]