Abstract
A tri(gold)boride of the formula B[AuP(o-Tol)3]3 (2) is generated in the reaction of the silylated phosphine borane Cy3PBH2SiMe3 with the tri(gold)oxonium tetrafluoroborate [(o-Tol)3PAu]3O+ BF4 - and isolated as its stable 1 : 1 complex with tricyclohexylphosphine: Cy3PB[AuP(o-Tol)3]3. The composition of the product has been confirmed by elemental analyses and mass spectrometry. Solution NMR data of 2 indicate a molecular structure with C3ν symmetry which has been confirmed by MP2 calculations for the model system H3PB(AuPH3)3. The compound is a rare case of a trimetallated boride which is isolobal with the simple phosphineborane Cy3PBH3. With reagents bearing less bulky substituents (R3 = iPr3, MePh2, Ph3), the reactions proceed to salts with the tetra-aurated cations [Cy3PB(AuPR3)4]+
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