TRANSITION-METAL STANNYL COMPLEXES .4. PALLADIUM AND PLATINUM COMPLEXES WITH CHELATING PHOSPHINOALKYLSTANNYL LIGANDS BY OXIDATIVE ADDITION OF SN-C BONDS

Reaction of (Ph3P)4Pd with two equivalents of Ph2PCH2CH2-SnR3 (R = Ph, Me) gives the Pd(II) stannyl complexes trans-activated Pd(PPh2CH2CH2SnR2)2 (2) by oxidative addition of two Sn - R groups and elimination of R - R. Products corresponding to earlier steps of the reaction are obtained by the reaction of (Ph3P)2Pt(C2H4) with Ph2P(CH2)nSnR3 (n = 2, 3). The phenyl derivatives Ph2P[CH2]nSnPh3 afford the Pt(II) complexes activated (Ph3P)(Ph)PtPPh2[CH2]nSnPh2 (3), in which the two phosphorus atoms are cis-configurated, while Ph2PCH2CH2SnMe3 gives the Pt(IV) complex cis,cis,cis-activated (Me)2Pt(PPh2CH2CH2SnMe2)2 (3) as stable product.