Trapping intermediates in phosphavinyl coupling reactions: Synthesis and structural characterization of a novel bis(phosphinoalkylidene)-tantalum complex, [{Cp*TaCl2[=C(But)-P(Cy)-]}2]

Cameron Jones, Anne F. Richards, Sebastian Fritzsche, Evamarie Hey-Hawkins

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Abstract

The reactions of the stable phosphavinyl Grignard reagent (Z)-(MgCl(OEt2){C(But=PCy}] with [Cp*TaCl4] or [Cp*NbCl4] have been investigated. In both cases phosphavinyl coupling reactions are the ultimate outcome to give the known 2,4-diphosphabicyclo-[1.1.0]butane, Cy2P2C2But2, in the former and a mixture of this compound and its 1,2-dihydro-1,2-diphosphete valence isomer in the latter. A novel bis(phosphinoalkylidene)-tantalum complex, [{Cp*TaCl2[=C(But)-P(Cy)-]}2], has been isolated and structurally characterized as an intermediate in the tantalum reaction.

Original languageEnglish
Pages (from-to)438-441
Number of pages4
JournalOrganometallics
Volume21
Issue number2
DOIs
Publication statusPublished - 4 Feb 2002

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