Synthesis and protonation of cyclohexadienyl manganese acylmetallates; alkyl and aryl group transfer from an acyl to a dienyl ligand
Abstract
Reaction of the cyclohexadienyl complex [(η5-C6H7)Mn(CO)3](1) with RLi gives the acylmetallates [Li(OEt2)][(η5-C6H7)Mn(CO)2C{O}R](R = Me, Ph)(2a,b) in 80–90% isolated yield, which, following protonation with HBF4·Et2O, undergo aryl or alkyl group transfer to the cyclohexadienyl ring; the products are new cyclohexenyl complexes [(η3-C6H8R)Mn(CO)3](3a,b) that contain an agostic endo C–H bond and an endo R group.