Robert Sidney Cahn (9 June 1899 – 15 June 1981) was a British chemist, best known for his contributions tochemical nomenclature andstereochemistry, particularly by theCahn–Ingold–Prelog priority rules, which he proposed in 1956 withChristopher Kelk Ingold andVladimir Prelog.^[1] Cahn was the first to report the structure ofCannabinol (CBN) found inCannabis in the early 1930s.^[2][3]

Cahn was born inHampstead, London. He became a fellow of theRoyal Institute of Chemistry^[4] and was editor of theJournal of the Chemical Society from 1949 until 1963, and he remained with the Society as Director of Publications Research until his retirement in 1965.^[5]

• Robert S. Cahn (1959).An Introduction to Chemical Nomenclature. Butterworths. and subsequent editions published in 1964, 1968, and 1974.

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