Abstract
The complex cis-[Pt(PPh3)2Cl2] forms distinct adducts with chloroform and NN-dimethylformamide. The existence of these adducts, for which X-ray powder results are given, accounts for several discrepancies in the literature. In particular, the product (recrystallised from chloroform–hexane) of reaction of carbon tetrachloride with tetrakis(triphenylphosphine)platinum(0), previously incorrectly formulated as [Pt(PPh3)2(CCl3)Cl], is in fact a partly desolvated sample of the chloroform adduct of the cis-dichloro-complex. In solution, cis–trans-isomerisation is easily set up providing access to the trans-isomer. Two further methods, which give much better yields of the trans-isomer, are described.
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