FORMATION OF THE FIRST HETEROBIMETALLIC PHOSPHIDO-BRIDGED SIGMA-PI-ACETYLIDE COMPLEX (2)TI(MU-SIGMA,ETA(2)-C-CPH)(MU-PPH(2))NI(PPH(3))] BY CLEAVAGE OF THE CENTRAL C-C SINGLE BOND IN PHC-C-C-CSIME(3) AND OF THEP-C BOND IN PH(3)P, AND COUPLING OF THE FRAGMENTS TO PHC-CSIME(3)

An unexpected activation of the central C-C single bond of PhC=C-C=CSi Me(3) and of one P-C bond in Ph(3)P and coupling of the fragments to P hC=CSiMe(3) was observed in the reaction of [Ni(PPh(3))(2)(eta(2)-PhC= C-C=SiMe(3))] with '(C5H5)(2)Ti' providing, via the tweezer-like titan ocene nickel(0) triphenylphosphine bisacetylide complex [(C5H5)2Ti(mu- sigma, eta(2)C=CSiMe(3))(C=CPh)Ni(PPH3)] 1, the phosphido-bridged sigm a-pi-acetylide complex [(C5H5)(2) Ti(mu-sigma, eta(2)-C=CPh)(mu-PPh(2) )Ni(PPh(3))] 2.