SYNTHESIS, CHARACTERIZATION AND STRUCTURE OF CYCLOPALLADATED FERROCENYLKETIMINES

The reactions of ferrocenylketimines C5H5FeC5H4C(CH3)=NAr (Ar = a vari ety of substituted phenyls, 1-naphthyl and 2-naphthyl) with lithium te trachloropalladate (II) in the presence of sodium acetate in methanol for about 20 h at room temperature and the treatment of the resulting products with triphenylphosphine lead to the five-membered cyclopallad ated derivatives [PdCl {C5H5FeC5H3C(CH3)=NAr} (PPh3)]. The structures of these metallocycles have been confirmed by IR and H-1 NMR spectrosc opies, and further by X-ray crystal structure determination of [PdCl { C5H5FeC5H3C(CH3)=N(C6H4-4-Cl)} (PPh3)]. The palladium atom shows the f our-coordinate structure typical of palladium complex, and the Pd-N di stance is 2.135 angstrom. The H-1 NMR spectra of [PdCl {C5H5FeC5H3C(CH 3)=NAr} (PPh3)] (Ar = C6H4-2-Cl and 1-naphthyl) show that both compoun ds exist as a mixture of two isomers.