rearrangement stage
The @E02035@ or @R05177@ (of a @M03997@) in which there is both making and breaking of bonds between atoms common to a reactant and a reaction product or a reaction @I03096@. If the @R05194@ stage consists of a single @E02035@, this is a '@R05194@ step'.
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1160 [Terms] [Paper]