1 Results We have recently reported the Mizoroki-Heck reaction catalyzed by PdCl2 and imidazole ligands[1]. During the course of our study of palladium imidazole complex,we disclosed the synthesis of trans-Pd(Ln)2Cl2 by the reaction of PdCl2 with Ln (where L1=2-phenylimidazole,L2=2-phenylimidazole) in a 1∶2 molar ratio.The single crystals of trans-Pd(L1)2Cl2·2DMF (1a) and trans-Pd(L2)2Cl2 (2a) were obtained by following slow evaporation of DMF as a solvent. The single crystal of trans-Pd(L2)2Cl2 (2b) was obtained by slow diffusion of toluene into the DMF solution of complexes,Pd(L1)2Cl2 (1b) was obtained in powder by this way. The compositions of isolated complexes have been determined by elemental analyses. The molecular structures of complex 1a,2a and 2b have been characterized by single crystal X-ray analysis (Fig.1). To compare their catalytic efficiency,the coupling reactions between 4-bromotoluene and tere-butylacrylate using isolated complexes were carried out. In the present of 0.1 mol% palladium complex 1a and 1b,the coupling product were obtained with a yield of 96% after 24 hours and 97% after 12 hours,respectively. The behaviors of obtained complexes in solution based on 1H NMR analysis will be also discussed in the symposium. 1 Results We have recently reported the Mizoroki-Heck reaction catalyzed by PdCl2 and imidazole ligands [1]. During the course of our study of palladium imidazole complex, we disclosed the synthesis of trans-Pd (Ln) 2Cl2 by the reaction of PdCl2 with Ln (where L1 = 2-phenylimidazole, L2 = 2-phenylimidazole) in a 1: 2 molar ratio. The single crystals of trans- Pd (L1) 2Cl2.2DMF (1a) and trans-Pd were obtained by the following slow evaporation of DMF as a solvent. The single crystal of trans-Pd (L2) 2Cl2 (2b) was obtained by slow diffusion of toluene into the DMF solution of complexes, Pd (L1) in powder by this way. The compositions of the isolated complexes have been determined by elemental analyzes. The molecular structures of complex 1a, 2a and 2b have been characterized by single crystal X-ray analysis (Fig.1). To compare their catalytic efficiency, the coupling reactions between 4-bromotoluene and tere-butylacrylate using isolated complexes were carried out. In the prese nt of 0.1 mol% palladium complex 1a and 1b, the coupling product were obtained with a yield of 96% after 24 hours and 97% after 12 hours, respectively. The behavior of obtained complexes in solution based on 1H NMR analysis will be discussed also in the symposium