Rule C-331 Acetals

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

Next:: Acetals and Acylals Rule C-332, Rule C-333

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