The ruthenostannylene complex [Cp(IXy)H₂Ru-Sn-Trip]: Providing access to unusual ru-sn bonded stanna-imine, stannene, and ketenylstannyl complexes

Reactivity studies of the thermally stable ruthenostannylene complex [Cp(IXy)(H)₂Ru-Sn-Trip] (1; IXy=1,3-bis(2,6-dimethylphenyl)imidazol-2-ylidene; Cp=η⁵-C₅Me₅; Trip=2,4,6-iPr₃C₆H₂) with a variety of organic substrates are described. Complex 1 reacts with benzoin and an α,β-unsaturated ketone to undergo [1+4] cycloaddition reactions and afford [Cp(IXy)(H)₂RuSn(κ²-O,O-OCPhCPhO)Trip] (2) and [Cp(IXy)(H)₂RuSn(κ²-O,C-OCPhCHCHPh)Trip] (3), respectively. The reaction of 1 with ethyl diazoacetate resulted in a tin-substituted ketene complex [Cp(IXy)(H)₂RuSn(OC₂H₅)(CHCO)Trip] (4), which is most likely a decomposition product from the putative ruthenium-substituted stannene complex. The isolation of a ruthenium-substituted stannene [Cp(IXy)(H)₂RuSn(=Flu)Trip] (5) and stanna-imine [Cp(IXy)(H)₂RuSn(κ²-N,O-NSO₂C₆H₄Me)Trip] (6) complexes was achieved by treatment of 1 with 9-diazofluorene and tosyl azide, respectively.