The preparation and x-ray characterisation of [(PPh2Me)2Pt(μ-PPhH)2Pt(PPh2Me)2] [Cl]4·CH2Cl2 and [(PPh2Me)2Pt(μ-PPhH)Pt(PPh2Me)2] [Cl]2 [PhPO2OH]2 [PhPO(OH)2]2