multi-centre reaction [obsolete]
A synonym for @P04491@. The number of 'centres' is the number of atoms not bonded initially, between which single bonds are breaking or new bonds are formed in the @T06468@. This number does not necessarily correspond to the ring size of the @T06468@ for the @P04491@. Thus, a Diels–Alder reaction is a 'four-centre reaction'. This terminology has largely been superseded by the more detailed one developed for the various pericyclic reactions.
pericyclic reaction
sigmatropic rearrangement
transition state
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1144 [Terms] [Paper]