A chemical reaction
in which concerted
reorganization of bonding takes place throughout a cyclic array of continuously bonded
atoms. It may be viewed as a reaction proceeding through a fully conjugated
cyclic transition state
. The number of atoms in the cyclic array is usually six, but other numbers are also
possible. The term embraces a variety of processes, including
(provided they are concerted).
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1150
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook