Aldehydes, Ketones, and their Derivatives

Acetals Rule C-331

331.1 - Compounds containing the group are termed acetals and are named substitutively as dialkoxy (etc.) compounds; alternatively, the name of the corresponding aldehyde or ketone is followed by that of the hydrocarbon radical(s) (if necessary with the prefix "di-", "bis", etc.), which in turn is followed by the word "acetal".

Examples to Rule C-331.1

331.2 - A cyclic acetal in which the two acetal-oxygen atoms form part of a ring may be named: (a) as a heterocyclic compound; (b) by use of the prefix "methylenedioxy-" for the group as a substituent in the remainder of the molecule, derivatives of the methylenedioxy group being named as substitution products thereof (see also Rule C-205.2); or (c) particularly when stereochemistry is implied in the name of the corresponding alcohol or ketone, as the alkylene or alkylidene derivative of that alcohol or as the alkylene or alkylidene acetal of that ketone (see Rule C-331.1).

Examples to Rule C-331.2

331.3 - The following are examples of trivial names that are retained:

331.4 - Compounds having the general formulae or are named substitutively as alkoxy (etc.) derivatives of the hydroxy compounds.

Example to Rule C-331.4

See Recommendations'93 R-5.6.4

Acetals and Acylals 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