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
R-1.1.4 Contiguous formal double bonds
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(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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