Sunday 24 April 2016

nomenclature - Nearest branch numbering


If the longest carbon chain is symmetric numbering-wise (meaning the numbering schemes are identical both ways) and has all alkyl substituents, should one prioritize the largest alkyl group?



Answer






Priority is given to the substituent with the largest overall summed atomic weight. Compare successive "left-handed" amino acids with their CIP notation, then cysteine (heavy sulfur).


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