It has been shown that (β-silyloxyacyl)cobalt tetracarbonyls are formed in the reaction between silylcobalt tetracarbonyl, terminal oxirane, and carbon monoxide. The linear acyl isomer is obtained with a regioselectivity of about 80%, which is practically independent of the nature of the substituents in the silyl group. Kinetic studies have revealed a first order dependence on Ph3SiCo(CO)4, an increasing order with respect to ethyloxirane, and zero order with respect to [Co(CO)4]- and CO. A mechanism involving a rapid formation of a tight ion pair, rate-determining internal SN2 type substitution, and fast insertion of CO is suggested.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Materials Chemistry