Manganese Silylene Hydride Complexes: Synthesis and Reactivity with Ethylene to Afford Silene Hydride Complexes

Reaction of the ethylene hydride complex trans-[(dmpe)₂ MnH(C₂ H₄ )] (1) with Et₂ SiH₂ at 20 °C afforded the silylene hydride [(dmpe)₂ MnH(=SiEt₂ )] (2 a) as the trans-isomer. By contrast, reaction of 1 with Ph₂ SiH₂ at 60 °C afforded [(dmpe)₂ MnH(=SiPh₂ )] (2 b) as a mixture of the cis (major) and trans (minor) isomers, featuring a Mn-H-Si interaction in the former. The reaction to form 2 b also yielded [(dmpe)₂ MnH₂ (SiHPh₂ )] (3 b); [(dmpe)₂ …