title: Palladacyclic complexes bearing CNN-type ligands as catalysts in the Heck reaction.
abstract: Preparations of novel unsymmetrical, tridentate nitrogen ligand precursors, PhN=C(CMe2)(NPh)C=N(CH2)2NMe2(1) and PhN=C(CMe2)(NPh)C=N(CH2)Py (2), are described. Treatment of 1 with 1 molar equiv. (COD)PdCl2 in the presence of NEt3 or with 1 molar equiv. Pd(OAc)2 affords orthometallated palladium(II) complexes, [PhN=C(CMe2)(N-eta1-Ph)C=N(CH2)2NMe2]PdX (X=Cl (3); X=OAc (4)), respectively. Compound can be yielded via the reaction of with an excess of LiCl in methanol. Treatment of with 1 molar equiv. of (COD)PdCl2, Pd(OAc)2 or Pd(TFA)2 affords orthometallated palladium(II) complexes, [PhN=C(CMe2)(N-eta1-Ph)C=NCH2Py]PdX (X=Cl (5); X=OAc (6); X=TFA (7)), respectively. The crystal and molecular structures are reported for compounds 2, 3, 5 and 6. The application of these novel palladacyclic complexes to the Heck reaction with aryl halide substrates was examined.
authors.affiliation: Department of Chemistry, National Chung-Hsing University, Taichung, 402, Taiwan, Republic of China. ctchen@mail.nchu.edu.tw
authors.forename: Chi-Tien
authors.initials: CT
authors.lastname: Chen
authors.forename: Yi-Sen
authors.initials: YS
authors.lastname: Chan
authors.forename: Yi-Ren
authors.initials: YR
authors.lastname: Tzeng
authors.forename: Ming-Tsz
authors.initials: MT
authors.lastname: Chen