INSERTIONS OF PHENYLACETYLENE WITH CHELATED S(TRIPHENYLPHOSPHINE)-RUTHENIUM(II)HYDRIDOCARBONYL COMPLEXES

Phenylacetylene reacts stoichiometrically or in excess with the Ru-H b ond of RuH(CO)(PPh3)2(L) (LH = 2-hydroxypyridine, 2-hydroxy-6-methylpy ridine, acetylacetone, benzoylacetone, 2-hydroxyacetophenone, 2-hydrox ypropiophenone, 2-hydroxybenzophenone and 4-methoxy-2-hydroxybenzophen one) in boiling benzene to give sigma-vinylic or sigma-vinylalkynyl co mplexes of the type Ru(CO)-(PPh3)2(L)(CH=CHPh) and Ru(CO)(PPh3)2(L){C- (C=CPh)=CHPh} in good yield. The vinylic complex can also be obtained by reacting the sodio derivative of the chelating ligand with the 16e- unsaturated complex, [Ru(CO)Cl(CH=CHPh)(PPh3)2], in CH2Cl2/MeOH mixtu re at ambient temperature. These complexes have been characterized by elemental analyses, and i.r., H-1, C-13 and P-31 n.m.r. spectroscopy.