Bring the power of IUPAC naming to your desktop!

ACD/Name (Chemist Version) offers a standardized set of features for quick and simple generation of IUPAC names, and structures from names. It is a streamlined version of our popular ACD/Name software.

View a full description and pricing on our web store.

Aldehydes, Ketones, and their Derivatives

Ketenes Rule C-321

321.1 - The compound CH2=C=CO is named ketene. Derivatives of ketene are named by substitutive nomenclature.

Examples to Rule C-321.1

(see Rule C-321.3)

Note: "Bis" is used to avoid ambiguity, since diketene is sometimes used for dimeric ketene.

321.2 - Ketenes in which the carbon atom of the CH2 group of ketene has been incorporated into a ring system are named by use of the prefix "carbonyl-".

Example to Rule C-321.2

Note: In such cases the use of "carbonyl" for =CO is analogous to use of "methylene" for =CH2.

321.3 - An acyl derivative of ketene may be named as a polyketone.

Example to Rule C-321.3

(see Rule C-321.1)

See Recommendations'93 R-5.6.3

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