Synthesis and ligand substitution reactions of κ4-B,S,S′,S-ruthenaboratranes

A range of ruthenaboratranes of the form [Ru(CO) L{kappa(4)-B,S,S',S ''-B(mt)(3)}] (mt = N-methylmercaptoimidazolyl) have been prepared either by substitution of the PPh3 ligand in [Ru(CO)(PPh3){kappa(4)-B,S,S',S ''-B(mt) 3}] by L (L = PMe2Ph, PMe3, P(OMe)(3), P(OEt)(3), P(OPh)(3)) or reactions of [RuCl(R)(CO)L-n] (R = Ph, CH=CHPh; n = 2, L = PCy3; n = 3, L = P(OMe)(3), PMe2Ph) with Na[HB(mt)(3)].