A @M03986@ with a @L03515@ appreciably longer than a molecular vibration (corresponding to a local potential energy minimum of depth greater than \(R\ T\)) that is formed (directly or indirectly) from the reactants and reacts further to give (either directly or indirectly) the products of a @C01033@; also the corresponding @CT01038@.
elementary reaction
reaction step
stepwise reaction
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1126 [Terms] [Paper]