|  | 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 Fulltext... Hierarchy... Expanded...C01; macromolecular compounds Fulltext... Hierarchy... Expanded...C08; dyes Fulltext... Hierarchy... Expanded...C09; fermentation products Fulltext... Hierarchy... Expanded...C12)

|  | C07 |
Note(s) 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 Fulltext... Hierarchy... Expanded...C07C 87/52), sodium oxalate is classified as oxalic acid (in Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...C07C and not in Fulltext... Hierarchy... Expanded...C07F— the alcoholates in Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C07C 31/28-C07C 31/32 and the phenates as the corresponding phenols in Fulltext... Hierarchy... Expanded...C07C 39/00. 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 59/24, 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 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 Fulltext... Hierarchy... Expanded...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