THE REACTION OF RU-3(MU-3-NPH)(MU-DIPHENYLPHOSPHINOMETHANE)(CO)8 WITH ALKYNES - CRYSTAL-STRUCTURE OF RU-2(MU-DIPHENYLPHOSPHINOMETHANE)(CO)4- (MU-2-ETA-3-HC=CPHC(O)NPH)

The μ3-nitrene cluster Ru3(μ3-NPh)(μ-DPPM)(CO)8 (1) (DPPM = diphenyl-phosphinomethane) reacts with PhCCR (R H, Ph) to give the binuclear metallapyrrolidone complexes Ru2(μ-DPPM)(CO)4(μ2-η3 -RCCPhC(O)NPh) (2, R H; 3, R Ph)), which are produced by combination of the alkyne with CO and the nitrene ligand. The structure of 2 has been determined crystallographically (2 is monoclinic, space group P21/n (no. 14) with a 11.749(4), b 28.428(5), c 12.586(3) Å, β 109.13(2)°, V 3972(3) Å3, Z = 4, R = 0.025 and Rω = 0.027 for 5150 absorption-corrected reflections having I ≥ 3σ(I)). Compounds 2 and 3 are compared with the analogous derivatives obtained by reaction of Ru3(μ3-NPh)(CO)10 with alkynes.