An η2-allene complex of rhenium formed form an alkyne: X-ray structure of [ReCl(η2-H2C–CCHPh)(Ph2PCH2CH2PPh2)2]

Abstract
Treatment of trans-[ReCl(N2)(dppe)2](dppe = Ph2PCH2CH2PPh2) with PhCCCH3 in refluxing benzene or tetrahydrofuran gives a product shown by X-ray analysis to be the η2-phenylallene complex [[graphic omitted]CHPh)(dppe)2].

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