Chemistry of the metal carbonyls. Part 74. Reactions of phenylmanganese pentacarbonyl with cycloheptatrienes, and related studies

Abstract

Phenyl-group migration occurs on treatment of [MPh(CO)₅](M = Mn or Re) with cycloheptatriene, yielding substituted cycloheptadienyl complexes [M{1–5-η-C₇H₈(Ph-6)}(CO)₃]. Hydride abstraction with [CPh₃][BF₄] gives an isomeric mixture of salts [Mn(1–6-η-C₇H₇Ph)(CO)₃][BF₄], whose reactions with nucleophiles have been studied. The complex [MnPh(CO)₅] also reacts with substituted cycloheptatrienes C₇H₇(R-7)(R = Me or Ph) to give [Mn{1–5-η-C₇H₇(R)(Ph)}(CO)₃] as an isomeric mixture. No products have been isolated from reactions of cycloheptatrienewith [MnR(CO)₅](R = Me or SiMe₃), but a low yield of the migration product has been obtained from [Mn(CH₂Ph)(CO)₅] and the triene.