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 Fulltext... Hierarchy... Expanded...C07C 59/25, Fulltext... Hierarchy... Expanded...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.
Albumens, proteins, alkaloids of unknown structure, glucosides of unknown structure are examples of compounds to be found unter Fulltext... Hierarchy... Expanded...C07G.
Inventions dealing with chemical compounds and their preparation are classified in the groups for the type of compound prepared. The processes of preparation should be secondarily classified in the groups for the types of reaction employed when such groups exist. 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 may be secondarily classified in the groups for the types of compounds prepared.
Inventions dealing with chemical compounds and their preparation are classified in the groups for the type of compound prepared. The processes of preparation should be secondarily classified in the groups for the types of reactions employed when such groups exist. 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 may be secondarily classified in the groups for the types of compounds prepared.
The term "preparation" in main-groups is to be understood as including purification, separation or stabilisation unless a separate main-group is provided therefor.
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 Kekulé form.
For the purpose of this sub-class, the following definitions apply:
A "hetero ring" is a ring having at least one halogen, nitrogen, oxygen, sulphur, selenium, or tellurium atom as a ring member.
Two rings are "condensed" if they share at least one ring member, i.e. "spiro" and "bridged" are considered as condensed. The term "bridged" denotes the presence of at least one fusion other than ortho, peri and spiro.
A "condensed ring system" is a ring system in which all rings are condensed among themselves.
The "number of relevant rings" in a condensed ring system equals the number of scissions necessary to convert the ring system into one acyclic chain.
The "relevant rings" in a condensed ring system are chosen according to the following criteria consecutively:
Lowest number of ring members;
Highest number of hetero atoms as ring members;
Lowest number of members shared with other rings;
Last place in the classification scheme.
For the purpose of classification, the following rules apply:
Compounds having only one hetero ring are classified in the last appropriate place in one of the groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...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.
In this sub-class it is desirable to add, in conformity with paragraph 61 of the Guide, after the double oblique stroke the symbols relating to complementary information concerning individual constituents of an invention unit which is already classified as such.
The set of classification symbols allotted to such complementary information is placed between brackets; first, the classification symbol of the invention unit is indicated again, followed by the symbol relating to each of the individual components, chosen according to the following guidelines:
In compounds containing two or more hetero rings covered by different main groups, neither condensed among themselves nor with a common carbocyclic ring system, each hetero ring is shown as complementary information. The appropriate marks are determined by scission of all other hetero rings and considering them as substituents. The locations of the scissions are chosen so as to obtain the substituents which appear in the later place in the classification, e.g. the relevant rings of are considered to be
For compounds containing two ore more condensed ring systems each having two or more hetero rings, each condensed system is shown as complementary information. The appropriate marks are found in the groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C07D 451/00-C07D 517/00 and determined by considering separately each condensed system in turn.
ACYCLIC, CARBOCYCLIC, OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULPHUR, SELENIUM, OR TELLURIUM (metal-containing porphyrins Fulltext... Hierarchy... Expanded...C07D 487/22)
C07F
Note(s)
Organic acid salts, alcoholates, phenates, chelates or mercaptides are classified as the parent compounds. Attention is also drawn to Note (1) following the class title of class Fulltext... Hierarchy... Expanded...C07. [2]
This sub-class is concerned with compounds containing saccharide radicals. Excluded are polysaccharides which for the purpose of this sub-class are defined as having more than five saccharide radicals attached to each other by glycosidic linkages. A "saccharide radical" is derived from acyclic polyhydroxy-aldehydes or acyclic polyhydroxy-ketones, or from their cyclic tautomers, by removing hydrogen atoms or by replacing hetero bonds to oxygen by the same number of hetero bonds to halogen, nitrogen, sulphur, selenium, or tellurium, in accordance with either of the following definitions:
A "saccharide radical"
consists of an uninterrupted carbon skeleton and oxygen atoms directly attached thereto, and
is considered to be terminated by every bond to a cyclic structure and by every bond to a carbon atom having three bonds to hetero atoms, e.g. ester or nitrile radicals, and
contains within the carbon skeleton an unconjugated sequence of at the most six carbon atoms in which at least three carbon atoms—at least two in the case of a skeleton having only four carbon atoms—have one single bond to an oxygen atom as the only hetero bond., and
in a cyclic or acyclic sequence, at least one other carbon atom has two single bonds to oxygen atoms as the only hetero bonds, or
in an acyclic sequence, at least one other carbon atom has one double bond to an oxygen atom as the only hetero bond.
A "saccharide radical" is also a radical derived from a radical as defined in (a) above by replacing at the most four of the specified hetero bonds to oxygen by the same number of hetero bonds to halogen, nitrogen, sulphur, selenium, or tellurium. [2]
This sub-class comprises compounds containing a cyclopenta (a) phenanthrene skeleton or a ring structure derived therefrom by contraction or expansion of one ring by one or two atoms, by contraction or expansion of two rings each by one atom, by contraction of one ring by one atom and expansion of one ring by one atom, by substitution of one or two carbon atoms of the cyclopenta (a) phenanthrene skeleton by hetero atoms, in combination with the above defined contraction or expansion or not, or by condensation with carbocyclic or heterocyclic rings in combination with one or more of the foregoing alterations or not. [2]