B(C6F5)3 adducts of transition metal acyl compounds

Abstract

The transition metal acyl compounds [Co(L)(CO)₃(COMe)] (L = PMe₃, PPhMe₂, P(4-Me-C₆H₄)₃, PPh₃ and P(4-F-C₆H₄)₃), [Mn(CO)₅(COMe)] and [Mo(PPh₃)(η⁵-C₅H₅)(CO)₂(COMe)] react with B(C₆F₅)₃ to form the adducts [Co(L)(CO)₃(C{OB(C₆F₅)₃}Me)] (L = PMe₃1, PPhMe₂2, P(4-Me-C₆H₄)₃3, PPh₃4, P(4-F-C₆H₄)₃5), [Mn(CO)₅(C{OB(C₆F₅)₃}Me)] 6 and [Mo(η⁵-C₅H₅)(PPh₃)(CO)₂(C{OB(C₆F₅)₃}Me)], 7. Addition of B(C₆F₅)₃ to a cooled solution of [Mo(η⁵-C₅H₅)(CO)₃(Me)], under an atmosphere of CO gave [Mo(η⁵-C₅H₅)(CO)₃(C{OB(C₆F₅)₃}Me)] 8. In the presence of adventitious water, the compound [Co{HOB(C₆F₅)₃}₂{OP(4-F-C₆H₄)₃}₂] 9, was formed from [Co(P(4-F-C₆H₄)₃)(CO)₃(C{OB(C₆F₅)₃}Me)]. The compounds 4 and 9 have been structurally characterised. The use of B(C₆F₅)₃ as a catalyst for the CO-induced migratory-insertion reaction in the transition metal alkyl compounds [Co(PPh₃)(CO)₃(Me)], [Mn(CO)₅(Me)], [Mo(η⁵-C₅H₅)(CO)₃(Me)] and [Fe(η⁵-C₅H₅)(CO)₂(Me)] has been investigated.