FORMATION OF AN ALLYL TIN BOND IN ETA(3)-ALLYL(TRICHLOROSTANNYL)PALLADIUM(II) COMPLEXES

Attempts were made to find conditions under which formation of the all yl-tin bond takes place efficiently starting from eta3-allylpalladium( II) complexes containing the Pd-SnCl3 bond. Addition of SnCl2 or allyl ic chloride was effective in this matter, while PPh3 and maleic anhydr ide, which had been known before to be good accelerators of couplings between the eta3-allyl ligand and carbon anions on Pd, were totally in effective for the allyl-SnCl3 coupling. Relative coordination ability of substituted styrenes in a series of complexes, Pd(eta3-CH2CMeCH2)(s tyrene)SnCl3) indicated a highly electron-deficient character of the P d center. A possible reaction scheme of the Pd-catalyzed formation of allyltin(IV) trichloride from SnCl2 and allylic chloride is discussed in the light of the above findings.