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)2RuSnTrip] (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.