Bis dimethyl phosphito-P o-phenylenebis dimethylarsine platinum II

This procedure is similar to that used for the synthesis of bis(dimethyl phosphito-P)[ethylenebis(diphenylphosphine)]platinum(Il).8 To a solution of bis(dimethyl hydrogen phosphite-i )bis(dimethyl phosphito- )platinum(II) (0.976 g, 1.5 mmole) in benzene (50 mL) is added o-phenylenebis(dimethylarsine) 9 (0.441 g, 1.5 mmole). The solution is heated at reflux with stirring for 1 hour and then allowed to cool to room temperature. The colorless compound precipitates and is collected by suction filtration on a medium-porosity fritted glass. The complex is washed with benzene (two 5-mL portions) and then 

The compound is very soluble in chloroform and dichloromethane and insoluble in benzene, diethyl ether, and ligroin. The H NMR spectrum shows a resonance for the methoxy groups at r 6.905 (3JpoCH = 12 Hz) with additional resonances from o-phenylenebis(dimethylarsine) centered at r 8.70 and 2.90. The complex forms the trimetallic compounds [ Pt[OP(OCH3)2] 2 [o-C6H4[As(CH3)2] 2 2M] (C104)2 [M = Cu, Co] on treatment with the appropriate metal perchlorate salt. 

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