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 Mossbauer 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.

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