Methimazolyl based diptych bicyclo-[3.3.0]-ruthenaboratranes

Abstract

The reactions of [RuCl(R)(CO)(PPh₃)₂] (R = CHCHPh, Ph) with Na[H₂B(mt)₂] (mt = N-methyl-2-mercaptoimidazolyl) transiently provide [Ru(R)(CO)(PPh₃){κ³-H,S,S′-H₂B(mt)₂}] which each evolve to the ruthenaboratrane [Ru(CO)(PPh₃)₂{κ³-B,S,S′-BH(mt)₂}](Ru→B)⁸. The phosphine ligands may be selectively replaced to provide the complexes [Ru(CO)(L)(PPh₃){κ³-B,S,S′-BH(mt)₂}] (L = CO, PMe₂Ph) and [Ru(CO)L₂{κ³-B,S,S′-BH(mt)₂}] (L = PMe₂Ph, P(OMe)₃, L₂ = Z-Ph₂PCHCHPPh₂) with, in each case, retention of the ruthenium–boron dative bond.