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
cycloadditions,
cheletropic reactions,
electrocyclic reactions,
sigmatropic rearrangements, etc.
(provided they are concerted).
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1150
Cite as:
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.
