(0)C07C:0/49:

IPC6

SECTION C - CHEMISTRY; METALLURGY

ACYCLIC OR CARBOCYCLIC COMPOUNDS

C07C

1/50

C07C001/00 - C07C001/36

C 07 C

ACYCLIC OR CARBOCYCLIC COMPOUNDS

Notes

(1)	In this subclass, the following terms or expressions are used with the meanings indicated:

-	"bridged" means the presence of at least one fusion other than ortho, peri or spiro;

-	two rings are "condensed" if they share at least one ring member, i.e. "spiro" and "bridged" are considered as condensed;

-	"condensed ring system" is a ring system in which all rings are condensed among themselves;

-	"number of rings" in a condensed ring system equals the number of scissions necessary to convert the ring system into one acyclic chain;

"quinones" are compounds derived from compounds containing a six-membered aromatic ring or a system comprising six-membered aromatic rings (which system may be condensed or not condensed) by replacing two or four

CH groups of the six-membered aromatic rings by >C=O groups, and by removing one or two carbon-to-carbon double bonds, respectively, and rearranging the remaining carbon-to-carbon double bonds to give a ring or ring system with alternating double bonds, including the carbon-to-oxygen bonds; this means that acenaphthenequinone or camphorquinone are not considered as quinones. [5]

(2)	In this subclass, in the absence of an indication to the contrary, a process is classified in the last appropriate place. [3]

(3)	In this subclass, in the absence of an indication to the contrary, "quaternary ammonium compounds" are classified with the corresponding "non-quaternised nitrogen compounds". [5]

(4)	For the classification of compounds in groups C 07 C 1/00 to C 07 C 71/00 and C 07 C 401/00 to C 07 C 409/00:

-	a compound is classified considering the molecule as a whole (rule of the "whole molecule approach");

-	a compound is considered to be saturated if it does not contain carbon atoms bound to each other by multiple bonds;

-	a compound is considered to be unsaturated if it contains carbon atoms bound to each other by multiple bonds, which includes a six-membered aromatic ring,

unless otherwise specified or implicitely derivable from the subdivision, as in group C 07 C 69/00, e.g. C 07 C 69/712. [5]

(5)	For the classification of compounds in groups C 07 C 201/00 to C 07 C 395/00, i.e. after the functional group has been determined according to the "last place rule", a compound is classified according to the following principles:

-	compounds are classified in accordance with the nature of the carbon atom to which the functional group is attached;

-	a carbon skeleton is a carbon atom, other than a carbon atom of a carboxyl group, or a chain of carbon atoms bound to each other; a carbon skeleton is considered to be terminated by every bond to an element other than carbon or to a carbon atom of a carboxyl group;

-	when the molecule contains several functional groups, only functional groups linked to the same carbon skeleton as the one first determined are considered;

-	a carbon skeleton is considered to be saturated if it does not contain carbon atoms bound to each other by multiple bonds;

-	a carbon skeleton is considered to be unsaturated if it contains carbon atoms bound to each other by multiple bonds, which includes a six-membered aromatic ring. [5]

(6)

In this subclass, it is desirable to add the indexing codes of subclass C 07 M. The indexing codes should be unlinked. [6]

Hydrocarbons (derivatives of cyclohexane or of a cyclohexene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene rings C 07 C 403/00; preparation of macromolecular compounds C 08; production or separation from undefined hydrocarbon mixtures such as petroleum oil C 10 G; natural gas, synthetic natural gas, liquefied petroleum gas C 10 L 3/00; electrolytic or electrophoretic processes C 25 B) [3]