PHOSPHINE COMPLEXES OF TUNGSTEN(O) POLY(ALKYNE) - CRYSTAL-STRUCTURES OF W(PHC-EQUIVALENT-TO-CPH)(3)(PME3) AND LC-EQUIVALENT-TO-CTOL)(2)(ETA(4)-C(4)TOL(4))(PME3)

Reactions of W(PhC=CPh)(3)L (L=CO or NCMe) with PMe3, PPh2Me and PPh3 produce W(PhC=CPh)(3)(PMe3), W(PhC=CPh)3(PPh2Me) and W(PhC=CPh)(3)(PPh 3), respectively. Reaction of W(PhC=CPh)(3)(NCMe) with 1,1'-bis(diphen ylphosphino) ferrocene (dppf) forms W(PhC=CPh)(3)(eta(1)-dppf) and [W( PhC=CPh)(3)](2)(eta(1),eta(1)-dppf). Treating W(RC=CR)(2)(eta(4)-C4R4) (NCMe) (R=Ph and Tol) with PMe3 affords W(RC=CR)(2)(eta(4)-C4R4)(PMe3 ). W(PhC=CPh)(3)(PMe3) crystallizes in the space group P (3) over bar with a=14.000(4), c=11.183(3) Angstrom, V=1898.3(7) Angstrom(3), Z=2 a nd R-F=0.032. W(TolC=CTol)(2)(eta(4)-C(4)Tol(4))(PMe3) crystallizes in the space group P2(1)/c with a=13.588(2), b=19.289(5), c=22.150(5) An gstrom, beta=90.57(2)degrees, V=5805.(2) Angstrom(3), Z=4 and R-F= 0.0 55.