SYNTHESIS OF PI-ALLYL-PALLADIUM COMPLEXES , STABILIZED BY TRIDENTATE OXYGEN LIGANDS [(C5H5)CO(P(OR)(2)O)(3)](-)

Complexes of the general formula [{(C5H5)Co{P(OR)(2)O}(3)}Pd(all)]=[L( OR)Pd(all)] (1-4) (OR=OMe, OEt; all=propenyl, 2-methyl-propenyl, 2-(t) butylpropenyl, 1,1,2-trimethylpropenyl) have been synthesized from the corresponding silver salt AgL(OR) and the dimeric pi-allyl-palladium complexes [{(all)PdCl}(2)]. These air-stable compounds are the first e xamples of 18-electron pi-allyl-palladium complexes stabilized by a tr ipodal oxygen donor, The X-ray structure of [{L(OMe)Pd(C3H5)}(2) . H2O ] has been determined. The compound crystallizes in the monoclinic spa ce group P2(1)/c with a=17.046(7), b=31.527(9), c=10.772(3) Angstrom, beta=127.71(4)degrees, Z=4. Two of the three oxygen donor atoms of the ligand coordinate strongly to palladium while the third in addition f orms a hydrogen bond to a water molecule. The palladium-oxygen interat omic distances are Pd1-O3=2.138(3), Pd1-O2=2.151(2), Pd1-O1=2.622(2), Pd2-O6=2.129(3), Pd2-O4=2.143(3) and Pd2-O5=2.689(3).