A @P04915@ reaction between two identical molecules (usually a solvent), one acting as a @B00744@ and the other as a @B00745@. For example:
A00531.png
Source: PAC, 1994,
66, 1077. (
Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1087 [
Terms] [
Paper]