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Principles of Organic Nomenclature

R-1.1.3 Nonstandard bonding numbers

A nonstandard bonding number of a neutral skeletal atom in a parent hydride is indicated by the symbol , cited in conjunction with an appropriate locant.

Examples to R-1.1.3

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R-1.1.4 Contiguous formal double bonds
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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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