Abstract
The conversion of the alkyne complex RhCl(PPr(i)3)2(eta2-PhC[triple bond]CH) into its vinylidene isomer RhCl(PPr(i)3)2(=C=CPhH) has been monitored via NMR spectroscopy in a range of solvents. In THF and hexane solution the reaction was observed to proceed via the alkynyl hydride complex Rh(H)Cl(PPr(i)3)2(-C[triple bond]CPh). The kinetic profile of the reaction demonstrates that this species is an intermediate in the formation of the vinylidene complex.
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