A range of ruthenaboratranes of the form [Ru(CO)L{κ4-B,S,S',S''-B(mt)3}] (mt = N-methylmercaptoimidazolyl) have been prepared either by substitution of the PPh3 ligand in [Ru(CO)(PPh3){κ4-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)Ln] (R = Ph, CH[double bond, length as m-dash]CHPh; n = 2, L = PCy3; n = 3, L = P(OMe)3, PMe2Ph) with Na[HB(mt)3].
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