DICHLOROMETHANE ASSISTED-OXIDATION OF PT(0) VIA CLEAVAGE OF TE-C-ARYL BOND OF AN ASYMMETRIC TELLURIDE LEADING TO THE FORMATION OF TRANS-[PTCL(AR)(PPH(3))(2)]

3-Aminopropyl (aryl) tellurides react with [Pt(PPh(3))(2)(C2H4)] in dichloromethane to form tellurium-free platinum(II) complexes [PtCl(Ar)(PPh(3))(2)] [Ar = Ph(A), C6H4-4-OMe(A')] along with Te(CH2Cl) {(CH2)(3)NH2)(B). The presence of Cl in the products clearly establishes the involvement of dichloromethane in the reaction. A free radical mechanism, involving Cl . and CH2Cl . radicals from dichloromethane has been proposed for the reaction. The products have been characterized by H-1, P-31{H-1} and Pt-195{H-1} NMR and IR spectra. The structures of A and A' have been determined by X-ray crystallography. The crystals belong to the orthorhombic crystal system, space group Pbca. The structure of the complex A' has been described in detail. It adopts a square planar arrangement of the ligands around the Pt atom. The P-Pt-P angle is 173.3(1)degrees, indicating the trans arrangement of the two triphenylphosphine groups around Pt. The Pt-Cl distance is 2.40(4) Angstrom and the Pt-C(1) distance is 2.01(1) Angstrom, whereas the Pt-P(1) and Pt-P(2) distances are 2.318(5) and 2.306(5) Angstrom, respectively. The square plane formed by P(1)ClP(2)C(1) is inclined at 70.0(5)degrees with respect to the plane of the six-membered ring attached to the Pt atom.