抄録
Classical and nonclassical Ru (II) and Os (II) polyhydride complexes stabilized by the tripodal polydentate ligand P (CH2CH2PPh2)3 (PP3) catalyze the regio- and stereo-selective dimerization of 1-alkynes to the corresponding (Z)-1,4-disubstituted butenynes. Reaction mechanisms accounting for the catalytic cycles are proposed. Irrespective of the nature of the hydride ligand (classical vs nonclassical) vinylidene complexes are the immediate precursors to the C-C bond forming step.
