OXIDATIVE ADDITION OF TIN(IV) COMPOUNDS TO ETHYLENE BIS(TRIPHENYLPHOSPHINE)PLATINUM

Reactions between [Pt(C2H4)(PPh3)2] and organotin halides have been investigated. With SnPh2Cl2 the product of insertion into the SnC bond, cis-[PtPh(SnPhCl2)(PPh3)2], was obtained, whereas SnMe2Cl2, SnPhCl3, SnMeCl3 and SnCl4 gave products of insertion into the Sn-Cl bond, viz. cis- and trans-[PtCl((SnClnR3-n)(PPh3)2]. The products were characterised by 31P - {1H} NMR spectroscopy. Compounds of similar stoichiometry [PtR(SnCl3)(PPh3)2] were examined for purposes of comparison and were obtained from SnCl2 and the corresponding chloro complexes. The compounds cis and trans [PtCl(SnCl3) (PPh3)2] were obtained both by the oxidative-addition reaction and the SnCl2 insertion route. A wide variety of similar products were obtained with organotin chlorides and bromides. Competition experiments indicated an order of reactivity in the oxidative addition reaction SnMe4 < SnPh4 < SnMe3Cl < SnPh3Cl, SnMeCl2 < SnPh2Cl2, SnMeCl3 < SnPhCl3 < SnCl4. The presence of radicals in the reaction mixture was not detected by radical transfer or spin-trapping experiments. © 1979.