C
SECTION C — CHEMISTRY AND METALLURGY
  
CHEMISTRY
 C07
ORGANIC CHEMISTRY (such compounds as the oxides, sulphides, and oxysulphides of carbon, cyanogen, phosgene, hydrocyanic acid and salts thereof C01; macromolecular compounds C08; dyes C09; fermentation products C12)
 C07

Note(s)

  1. 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 C07C 87/52), sodium oxalate is classified as oxalic acid (in C07C 55/06), 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 C07C and not in C07F— the alcoholates in C07C 31/28-C07C 31/32 and the phenates as the corresponding phenols in C07C 39/00.
  2. In the absence of an indication to the contrary, and with the exception referred to below, a compound is always classified in the last appropriate place in the classification system, e.g. a compound containing an acyclic chain and a heterocyclic ring is classified only as a heterocyclic compound, and a sterol is classified only as a cyclopentanophenanthrene compound. In general, and in the absence of an indication to the contrary (such as groups C07C 59/24, C07C 59/26), 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.
  3. Albumens, proteins, alkaloids of unknown structure, glucosides of unknown structure are examples of compounds to be found unter C07G.
  4. Inventions dealing with the preparation of chemical compounds might be classified both according to the type of reaction employed and according to the type of compound prepared, if suitable groups or sub-groups exits.
 C07B
GENERAL METHODS AND APPARATUS OF ORGANIC CHEMISTRY
 C07B 1/00
Hydrogenation
 C07B 3/00
Oxidation; Dehydrogenation
 C07B 5/00
Dehydration, i.e. removal of the elements of water from organic substances
 C07B 5/02
·  from at least two molecules
 C07B 7/00
Hydrolysis
 C07B 9/00
Halogenation
 C07B 11/00
Nitration
 C07B 13/00
Sulphonation
 C07B 13/02
·  by reacting with sulphonating agents
 C07B 13/04
·  by oxidising sulphides, thiocyanates, or other compounds containing sulphur
 C07B 13/06
·  Sulphonating apparatus
 C07B 15/00
Diels-Alder reactions
 C07B 17/00
Grignard reactions
 C07B 19/00
Separation of one or both optically-active isomers from a racemic mixture
 C07B 19/02
·  by microbiological processes
 C07B 21/00
Separation of organic compounds by forming complex molecular compounds, e.g. with urea
 C07B 23/00
Introduction of isotopes of elements into organic compounds
 C07B 25/00
Decarboxylation
 C07B 27/00
Alkylation
 C07B 29/00
Other general methods (telomerisation C08F)
 C07B 29/02
·  Minor chemical modification of existing molecules by microbiological processes
 C07B 29/04
·  Generation of organic free radicals
 C07B 29/06
·  Preparative methods using electrolytic techniques