Highly Conjugated Ligand Bearing Dibenzoa,cacridine Moiety and Their nnc Palladium (Ⅱ) Pincer Complexes: Synthesis, Characterization and Catalytic Activity for Heck Coupling
Palladium complexes have been found to be powerful synthetic tool for numerous organic transformation reactions.1, 2 Palladium catalyst rationalized with Carbon-Pd bond so called pincer complex feature them high level of thermal stability and tolerance of most of functional groups, hence preventing their easy deactivation and leading to highly productive catalyst.3 Meanwhile, pincer complexes are exceptional in determining the balance between stability verses reactivity.4 In order to uphold the reactivity of pincer complexes, a new series of highly conjugated NNC palladium (Ⅱ) pincer complex were synthesized by facile treatment of 10-1-(2,6-dialkylphenylimino)ethyl-14-(2,6-dialkylphenylimino)methyldibenzoa,cacridine derivative with PdCl2(CH3CN)2 under various reaction condition.All the ligands and corresponding pincer complexes were unambiguously characterized by FT-IR, 1H & 13C NMR and elemental analysis.X-ray diffraction has revealed that all complexes adopted distorted-square-planar geometry around Pd metal center.The obtained pincer palladium complexes have been investigated for the coupling reaction of haloarenes with styrene and N-tert-butylacrylamide and the results showed all palladium complexes exhibited good catalytic activity-toward these coupling reactions.The complex Pd2 has been found best catalytic activity (TOF =4375) for the coupling of bromobenzene with styrene probably due to the replacement of imine group with aldehyde moiety at back bone of ligand framework.
Qaiser Mahmood Erlin Yue Wenjuan Zhang Wen-Hua Sun
Key Laboratory of Engineering Plastics and Beijing National, Laboratory for Molecular Sciences,Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
国际会议
9th International Symposium on High-Tech Polymer Materials(第9届国际高技术高分子材料学术会议)(HTPM-9)
郑州
英文
99-99
2016-07-11（万方平台首次上网日期，不代表论文的发表时间）