The dihydride−dihydrogen complex [OsH 2 (η 5 -C 5 H 5 )(η 2 -H 2 )(P i Pr 3 )]BF 4 ( 1 ) reacts with phenylacetylene to give the allenylcarbene derivative [Os(η 5 -C 5 H 5 ){ CPh(η 2 -CH C CHPh)}(P i Pr 3 )]BF 4 ( 2 ) via the π-phenylacetylene intermediate [Os(η 5 -C 5 H 5 )(η 2 -PhC⋮CH)(P i Pr 3 )]BF 4 ( 3 ). The reactions of 2 with NaOMe and LiC⋮CPh afford 3:1 mixtures of two hydride−osmaindene isomers of formula ( 4 and 5 ) instead of the expected osmabenzyne complex.
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Esteruelas et al. (2007) studied this question.
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