Nucleophilic attack by 2-pyridylpalladium(II) and platinum(II) complexes on the organic chlorides ClCH2R (R = COMe, CN, Ph, Cl)

Article abstract of DOI:10.1016/0022-328X(92)80032-S

The 2-pyridyl complexes trans-2)(PPh3)2> (M = Pd, 1a; M = Pt, 1b), 2)(dppe)> (M = Pd, 2a; M = Pt, 2b) and 2)(PPh3)> (M = Pd, 3a; M = Pt, 3b) react with the chlorides ClCH2R (R = COMe, CN, Ph) to give cationic products containing the 2-pyridylium ligands (1-CH2R)C5H4N-C².The rate of nucleophilic displacement of the chloride ion from ClCH2R depends on the central metal (Pt > Pd), on the coordination geometry (1 < 2 ca. 3) and on the substituent R (COMe > CN > Ph for the reactions with 3b).Like 1b and 2b, complex 3b also reacts with dichloromethane to give 2>(PPh3)>⁺.The reaction of the binuclear compound <2,N)(PPh3)>2> with chloroacetone in the presence of chloride ion yields the zwitterionic derivative cis-2>(PPh3)>.The cationic products have been isolated and characterized as perchlorate salts.