https://doi.org/10.1351/goldbook.O04367
The insertion of a metal complex into a covalent bond involving formally an overall two-electron loss on one metal or a one-electron loss on each of two metals, i.e. LnMm+XYLnMm+2(X)(Y) or 2LnMm+XYLnMm+1(X)+LnMm+1(Y) In radical chemistry, the term is used to indicate a radical addition to a carbon–carbon double bond, under oxidative conditions. For example:
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1149 [Terms] [Paper]