A convenient synthetic route to substituted phosphavinyl Grignard reagents: Synthesis and characterisation of [{RP=C(But)MgX(OEt2)}2] (R = cyclohexyl, cyclopentyl, ethyl or mesityl; X = Cl or Br)
The regio- and stereo-selective addition of a series of Grignard reagents across the phosphaalkyne P≡CBut conveniently affords high yields of the phosphavinyl Grignard reagents, [{RP=C(But)MgX(OEt2)}2] (R = cyclohexyl, cyclopentyl, ethyl or mesityl; X = Cl or Br), two of which have been structurally characterised. The Royal Society of Chemistry 1999.