Note that, in contrast to the Rules given in Section A, this rule does not require that a free valence terminates the chain (cf. Rules A-2.25, A-3.5). Note also that the suffixes "-ylidene", "-ylidyne" and "-ylene" codified in Section A and B are not included here. The Commissions are continuing to study these areas.

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.

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