DIFFERENT REACTIVITY OF THE RU-O BOND IN THE CHELATED [(METHOXYETHYL)DIPHENYLPHOSPHINE]RUTHENIUM(II) COMPLEXES [(ETA(6)-C6ME6)RU(P-BOOLEAN-AND-O)X][BR4] IN DEPENDENCE ON X = CL AND CH3

Treatment of the starring complexes [(eta(6)-C6Me6)Ru(P similar to O)X -2] (X = Cl (1), CH3 (2); P similar to O = eta(1) (P)-coordinated ethe r-phosphine ligand Ph2PCH2CH2OCH3) with NaBPh4 and HBF4, respectively, lead to the chelated complexes [(eta(6)-C6Me6)Ru((PO)-O-0)X][BR4] (X = Cl (3a), CH3 (3b); R = Ph (3a), F (3b); (PO)-O-0 = eta(2) (O,P)-coor dinated ligand). The rupture of the Ru-O bond in 3a,b with carbon mono xide and acetonitrile results in the formation of the corresponding co mplexes [(eta(6)-C6Me6)Ru(CO)(P similar to O)X][BR4] (4a,b) and [(eta( 6)-C6Me6)Ru(CH3CN)(P similar to O)X][BR4] (5a,b). The structure of 4a was determined by single-crystal X-ray diffraction. In a similar way t he cleavage of the Ru-O bond is achieved when 3a is reacted with tert- butyl isocyanide and 3b with ethene to give the adducts [(eta(6)-C6Me6 )Ru((CNBu)-Bu-t)(P similar to O)Cl][BPh4] (6a) and [(eta(6)-C6Me6)Ru(e ta(2)-C2H4)(CH3)(P similar to O)][BF4] (7b). All compounds are obtaine d in excellent yields and under mild conditions. (C) 1998 Elsevier Sci ence S.A. All rights reserved.