Investigations of the Structure and Reactivity of a Stannaketenimine

A double π donor–acceptor bond is the best description of the Sn–C double bond in stannaketenimine 1. The X-ray crystal structure analysis reveals a bent framework, which points out the analogy between 1 and the distannene 2. Compound 1 dissociates relatively easily (ΔH0 ≈ 30 kJmol−1, ΔS0 ≈ 90 JK−1mol−1) and reacts as R2Sn: and :CNR1. R = 2,4,6-(CF3)3C6H2, R1 = 2,4,6-(CH3)3C6H2, R′ = (Me3Si)2CH.