Principles of Organic Nomenclature
R-1.1.2 Standard bonding numbers The bonding number of a skeletal atom is standard when it has the value given in the following table:
|Standard bonding number (n)
R-1.1.3 Nonstandard bonding numbers
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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