enforced concerted mechanism

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 @[email protected] shorter than a bond vibration, so that the steps become concerted. The @[email protected] structure will lie on the coordinate of the @[email protected] 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 [Terms] [Paper]