COMPLEXES OF THE PLATINUM METALS .44. BENZAMIDATO AND TOLUAMIDATO DERIVATIVES OF RUTHENIUM AND OSMIUM

Benzamide reacts with [RuH2(CO)(PPh3)3] and [RuH(Cl)(PPh3)3] or [RuCl2 (PPh3)3]-NEt3 in boiling toluene to afford the amidato products u{mu-N HC(O)C6H4}{mu-NHC(O)Ph}{mu-H)Ru(CO)=)PPh3)2] 1a and [Ru2(mu-Cl)(mu-H){ mu-NHC(O)Ph}2(PPh3)4] 2a respectively as orange or red air-stable crys tals. Parallel reactions with o-, m- and p-toluamides yield analogous products 1b-1d and 2b-2d. Carbonylation of [Ru2(mu-Cl)(mu-H){mu-NHC(O) Ph}2(PPh3)2] in boiling toluene affords the dicarbonyl [Ru2(mu-Cl)(mu- H){mu-NHC(O)Ph}2(CO)2(PPh3)2] 3. Benzamide also reacts with [OsH2(CO)( PPh3)3] to yield the bis(benzamidato) complex [Os{NHC(O)Ph}2(CO)2(PPh3 )2] 4. A crystallographic study of la established a binuclear structur e bridged by hydride, benzamidate(1-) and benzamidate(2-) ligands.