Reactions between Ru(CO)ClH(PPh3)3 and phenylacetylene, pent-1-yne and diphenylacetylene in CH2Cl2 give the red crystalline alkenyl species Ru(CO)Cl-(RCHR′)(PPh3)2 (R = H, R′ = C3H7, Ph; R = R′ = Ph), which can be regarded as resulting from elimination of one phosphine molecule and insertion of the alkyne into the RuH bond. The reaction with phenylacetylene in MeOH/CH2Cl2 ( 1 1) gives the yellow crystalline complex Ru(CO)Cl(PhCCH2)-(PPh3)3, seemingly resulting from a simple insertion of the alkyne into the RuH bond. The complexes have been characterized by elemental analysis and 1H NMR and IR spectroscopy. The molecular structure of Ru(CO)Cl(PhCCHPh)(PPh3)2, determined by X-ray diffraction, can be described as a distorted trigonal bipyramidal species, in which the phosphine molecules occupy the axial positions and the alkenyl ligand has the phenyl groups in a cis configuration. Similar molecular structures are probable for the other red complexes. The yellow complex derived from phenylacetylene seems to be a six-coordinate species, in which two phosphine molecules are respectively cis- and trans-coordinated with respect to the alkenyl ligand. © 1986.
|Journal||Journal of Organometallic Chemistry|
|Publication status||Published - 1 Jan 1986|