The First Bimetallic Metallaboratrane: [Rh2{B(mt)3}2{κ2-S,S‘-HB(mt)3}]Cl and Its Synthesis from the Fluxional Rhodaboratrane Salt [Rh{B(mt)3}(η4-C8H12)]Cl, (Rh→B, mt = Methimazolyl)

Abstract

The prolonged reaction of [Rh{B(mt)3}(η4-C8H12)]Cl, prepared from [Rh(η4-C8H12)Cl]2 and 2 equiv of Na[HB(mt)3], with a further excess of Na[HB(mt)3] leads to formation of the first binuclear metallaboratrane salt, [Rh2[B(mt)3]2{κ2-S,S‘-HB(mt)3}]Cl. This compound, which is also observed as a decomposition product of rhodium tris(methimazolyl)borane complexes, affords the first evidence for bridging of transition metals by the methimazolyl sulfur donors.