Complex [OsH(η 5 -C 5 H 5 )(⋮C−CH 2 Ph)(P i Pr 3 )]BF 4 ( 1 ) reacts with KBr in tetrahydrofuran to give the π-olefin derivative OsBr(η 5 -C 5 H 5 )(η 2 -CH 2 CHPh)(P i Pr 3 ), which has been characterized by X-ray diffraction analysis. Similarly, the reaction of [OsH(η 5 -C 5 H 5 )(⋮C−CD 2 Ph)(P i Pr 3 )]BF 4 ( 1- d 2 ) with KBr leads to the π-dideuterated-olefin complex. On the basis of the deuterium distribution in this complex and the previously reported P(OMe) 3 -assisted hydride-carbyne to carbene transformation, the mechanism of the Br-assisted hydride-carbyne to olefin transformation is discussed.
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Baya et al. (2002) studied this question.