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Treatment of tricyclohexylphosphine(trimethylsilyl)borane with tris[(triphenylphosphine)gold(l)]oxonium tetrafluoro-borate [in tetrahydrofuran (thf) at –78 °C] affords moderate yields of the title compound [(Cy3P)B(AuPPh3)4]+ BF4-, the cation of which features pentacoordinate boron atoms in the centre of a (pseudo) square pyramid with the Cy 3P ligand in the apical position (Cy = cyclohexyl).
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Blumenthal et al. (1993) studied this question.
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