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Platinum(II) complexes of a diphosphine ligand xantphos (4,5-bis(diphenylphosphino)-9,9-dimethyl-xanthene) have been synthesised and characterised by NMR, conductivity and catalytic investigations. In addition to the parent complex cis-PtCl 2 (xantphos), trans-platinum(II) complexes of square-planar geometry containing xantphos as a trans-chelating ligand can be obtained due to the large bite...