Co−C Bond Homolysis: Reactivity Difference between Alkyl- and Benzylcobaloximes

The Co−C bond is activated toward homolysis due
to the interactions between axial and equatorial dioxime ligands.
Benzylcobaloxime gives an oxygen-inserted product, whereas
the alkyl derivative forms air-stable cobalt(II). The stabilization
of the axial R group due to the interaction between axial and
equatorial ligands causes the reactivity difference.