Trapping Intermediates in Phosphavinyl Coupling Reactions: Synthesis and Structural Characterization of a Novel Bis(phosphinoalkylidene)−Tantalum Complex, [{Cp*TaCl2[C(But)−P(Cy)−]}2]
摘要:
The reactions of the stable phosphavinyl Grignard reagent (Z)-[MgCl(OEt2){C(Bu-t)=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, Cy2P2C2Bu2t, 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*TaCl(2)f=C(Bu-t)-P(Cy)]}(2)], has been isolated and structurally characterized as an intermediate in the tantalum reaction.
Trapping Intermediates in Phosphavinyl Coupling Reactions: Synthesis and Structural Characterization of a Novel Bis(phosphinoalkylidene)−Tantalum Complex, [{Cp*TaCl<sub>2</sub>[C(Bu<sup>t</sup>)−P(Cy)−]}<sub>2</sub>]
作者:Cameron Jones、Anne F. Richards、Sebastian Fritzsche、Evamarie Hey-Hawkins
DOI:10.1021/om010632+
日期:2002.1.1
The reactions of the stable phosphavinyl Grignard reagent (Z)-[MgCl(OEt2)C(Bu-t)=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, Cy2P2C2Bu2t, 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*TaCl(2)f=C(Bu-t)-P(Cy)]}(2)], has been isolated and structurally characterized as an intermediate in the tantalum reaction.