Complexes of the platinum metals. Part 44. Benzamidato and toluamidato derivatives of ruthenium and osmium
Abstract
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 [(Ph3P)(OC) [graphic omitted]6H4}{µ-NHC(O)Ph}(µ-H)Ru(CO)(PPh3)2]1a and [Ru2(µ-Cl)(µ-H){µ-NHC(O)Ph}2(PPh3)4]2a respectively as orange or red air-stable crystals. Parallel reactions with o-, m- and p-toluamides yield analogous products 1b–1d and 2b–2d. Carbonylation of [Ru2(µ-Cl)(µ-H){µ-NHC(O)Ph}2(PPh3)4] in boiling toluene affords the dicarbonyl [Ru2(µ-Cl)(µ-H){µ-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 1a established a binuclear structure bridged by hydride, benzamidate(1–) and benzamidate(2–) ligands.
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