Variation of reaction parameters in a series of reactions proceeding in non-concerted
steps may lead to a situation where the putative intermediate will possess a lifetime
shorter than a bond vibration, so that the steps become concerted. The transition state
structure will lie on the coordinate of the More O'Ferrall–Jencks diagram
leading to that of the putative intermediate.
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1112
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