Novel ring-opened reaction of µ-(1–3-η:4–7-η-cycloheptatrienyl)-tricarbonylirontricarbonylmanganese with aryllithium reagents

Abstract

The reactions of µ-(1–3-η:4–7-cycloheptatrienyl)tricarbonylirontricarbonylmanganese [Mn(CO)₃Fe(CO)₃- (C₇H₇)] 1, with aryllithium reagents, ArLi (Ar = Ph, o-, m-, p-MeC₆H₄), in ether at low temperature, followed by alkylation of the acylmetalate intermediates with Et₃OBF₄ in aqueous solution at 0 °C affords four novel ring-opened polyene complexes [Mn(CO)₃Fe(CO)₃{C₈H₇(OEt)Ar}] (Ar = Ph 2, o-MeC₆H₄ 3, m-MeC₆H₄ 4, p-MeC₆H₄ 5), of which the structure of 2 has been established by a single-crystal X-ray diffraction study.