The reduction of PtLCl2 (L = R2P(CH2)nPR2) n = 2, R = Et, Ph, CHMe2; n = 1, 3, 4, R = Ph) by NaBH4 in THF under CO atomsphere gave PtL(CO)2. On work-up PtL(CO)2 were converted to Pt4L3(CO)3 clusters. The oxidative substitution reactions of PtL(CO)2 with RX (R = Me, Et, Ph, PhCH2; X = Cl, Br, I) were studied by IR and 1H and 31P NMR spectra; the oxidative substitution products are PtLX2 and in some cases Me complexes as the oxidative addition products. PtLX2 (L = (Me2CH)2PCH2CH2P(CHMe2)2) is orthorhombic, space group I4c2, a 15.14321, b 15.14321, c 19.16199 ? Z = 8, R = 0.0489.

Key words: OXIDATION, MOLECULAR STRUCTURE, CARBONYL COMPLEX, PROTON MAGNETIC RESONANCE SPECTROMETRY, PHOSPHINE, PLATINUM COMPLEX, HALOHYDROCARBON, ADDITION REACTION