A chemical reaction, the principal product of which is @[email protected] with the principal reactant. An @[email protected] isomerization that involves the breaking or making of bonds is a special case of a @[email protected] Isomerization does not necessarily imply @[email protected] (e.g. in the case of the interconversion of conformational isomers).
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1129 [Terms] [Paper]