Reaction of tricarbonyliron complexes of some cycloheptatrienes with tetracyanoethylene, sulphur dioxide, and protons

Abstract

Tricarbonyl(3–6-η-cycloheptatriene)iron, (1), forms a reversible 1 : 1 adduct with sulphur dioxide. The adductand other tricarbonyliron complexes with the σ, η³ mode of bonding exhibit small Mössbauer quadrupole splittings. Tetracyanoethylene undergoes 1,3-addition to the unco-ordinated side of the ring of both the 1- and 2-acetyl derivatives of (1), whereas the proton adds to the co-ordinated double bond of the 2-acetyl derivative.