Aldehydes, Ketones, and their Derivatives

Cyclic Aldehydes Rule C-304

304.1 - The name of an aldehyde in which the aldehyde group is directly attached to a carbon atom of a ring system is formed by adding the suffix "-carbaldehyde", "-dicarbaldehyde", etc., to the name of the ring system.

Examples to Rule C-304.1

304.2 - An aldehyde group in a cyclic compound is named by the prefix "formyl-" when a group having priority for citation as principal group is also present.

Example to Rule C-304.2

304.3 - A -CHO group attached to a nitrogen atom in a ring system is denoted by the prefix "formyl-" (see Rule C-824.2) or according to Rule C-304.1.

Example to Rule C-304.3

304.4 - When the aldehyde group is separated from the ring by a chain of carbon atoms, the compound is named (a) as a derivative of the acyclic system or (b) by conjunctive nomenclature.

Examples to Rule C-304.4

304.5 - When a compound RCH3 has a trivial name, the related aldehyde RCHO may be named as the product of its substitution by O= the prefix "oxo-" is used to denote this substitution (see Rules C-411.1, and C-415.1).

Example to Rule C-304.5

See Recommendations'93 R-5.6.1

Aldehydes Rule C-305
Ketones Rule C-311, Rule C-312, Rule C-313, Rule C-314 , Rule C-315, Rule C-316, Rule C-317, Rule C-318
Ketenes Rule C-321
Acetals and Acylals Rule C-331, Rule C-332, Rule C-333

This HTML reproduction of Sections A, B and C of IUPAC "Blue Book" is as close as possible to the published version [see Nomenclature of Organic Chemistry, Sections A, B, C, D, E, F, and H, Pergamon Press, Oxford, 1979. Copyright 1979 IUPAC.] If you need to cite these rules please quote this reference as their source.

Published with permission of the IUPAC by Advanced Chemistry Development, Inc.,, +1(416)368-3435 tel, +1(416)368-5596 fax. For comments or suggestions please contact