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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 groupExamples 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-5.6.4Example to Rule C-331.4
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