A step on the
reaction path of some
stepwise reactions in which the
molecular entity C is already present in an
encounter pair or
encountercomplex with A during the formation of B from A, e.g.
In this mechanism the
chemical species C may but does not necessarily assist the formation of B from A, which may itself
be a
bimolecular reaction with some other
reagent. Pre-
association is important when B is too short-lived to permit B and C to come together by
diffusion.
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1152
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.
