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. \[\text{L}_{n}\text{M}^{m}+\text{XY}\rightarrow \text{L}_{n}\text{M}^{m+2}\left(\text{X}\right)\left(\text{Y}\right)\] or \[2\text{L}_{n}\text{M}^{m}+\text{XY}\rightarrow \text{L}_{n}\text{M}^{m+1}\left(\text{X}\right)+\text{L}_{n}\text{M}^{m+1}\left(\text{Y}\right)\] In radical chemistry, the term is used to indicate a radical addition to a carbon–carbon double bond, under oxidative conditions. For example: