Interconversion and reactivity of manganese silyl, silylene, and silene complexes

Manganese disilyl hydride complexes [(dmpe)₂MnH(SiH₂R)₂] (4^Ph : R = Ph, 4^Bu : R = ⁿ Bu) reacted with ethylene to form silene hydride complexes [(dmpe)₂MnH(RHSi[double bond, length as m-dash]CHMe)] (6^Ph,H : R = Ph, 6^Bu,H : R = ⁿ Bu). Compounds 6^R,H reacted with a second equivalent of ethylene to generate [(dmpe)₂MnH(REtSi[double bond, length as m-dash]CHMe)] (6^Ph,Et : R = Ph, 6^Bu,Et : R = ⁿ Bu), resulting from apparent ethylene insertion into …