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-331.1
331.3 - The following are examples of trivial names that are retained:
Examples to Rule C-331.2
331.4 - Compounds having the general formulae or are named substitutively as alkoxy (etc.) derivatives of the hydroxy compounds.
See Recommendations'93 R-5.6.4
Example to Rule C-331.4
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