ACD/Name

Principles of Organic Nomenclature

R-1.2.6 Ring formation or cleavage

R-1.2.6.1 The prefix cyclo-. The formation of a ring by means of a direct link between any two atoms of a parent structure, with loss of one hydrogen atom from each, is indicated by he prefix "cyclo-" followed by the name of the parent structure; when appropriate, this prefix is preceded by the locants of the positions joined by the new bond and by the Greek letter (a, b, g) denoting the configurations at the ends of the new bond. (See R-2.3.1.1 and Section F of the 1979 edition of the IUPAC Nomenclature of Organic Chemistry).

Examples to R-1.2.6.1

R-1.2.6.2 The prefix seco-. Cleavage of a ring with addition of one or more hydrogen atoms at each terminal group thus created is indicated by the prefix "seco-" (see also Section F of the 1979 edition of the IUPAC Nomenclature of Organic Chemistry).

Examples to R-1.2.6.2

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R-1.2.7 Rearrangement
R-1.2.8 Multiplicative operation

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This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.

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