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Pure Appl. Chem., Vol. 71, No. 3, pp. 531-558, 1999

ORGANIC CHEMISTRY DIVISION

COMMISSION ON NOMENCLATURE OF ORGANIC CHEMISTRY

Extension and revision of the nomenclature for spiro compounds

(IUPAC Recommendations 1999)

Prepared for publication by G.P. Moss

World Wide Web version prepared by G. P. Moss

Abstract: Spiro ring systems have two or more rings linked by one common atom. Several different methods are used to name such systems. Rules A-41, A-43, B-10 and B-12 (Nomenclature of Organic Chemistry, 1979) describe the basics of how to name these compounds. The alternative methods in rules A-42 and B-11 are abandoned.

This document describes the nomenclature in greater detail and extends it to cover branched polyspiro systems and compounds where three rings have one common spiro atom. A new notation, based on the von Baeyer method of naming spiro systems where all components are monocyclic, allows both unbranched and branched polyspiro systems to be named without ambiguity. It also enables the names to be readily interpreted.

World Wide Web version prepared by G. P. Moss

http://www.chem.qmw.ac.uk/iupac/spiro/


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