Ionic Ni(ii) complexes containing a triphenylphosphine ligand and an imidazolium cation: synthesis, structures and catalysis for aryl Grignard cross-coupling of aryl halides
作者:Yan-Chao Xu、Jie Zhang、Hong-Mei Sun、Qi Shen、Yong Zhang
DOI:10.1039/c3dt00086a
日期:——
1H NMR spectroscopy; X-ray crystallography was performed for 1a, 1b, 2a, and 2b. A catalytic study of the cross-coupling reactions of aryl Grignard reagents with aryl halides revealed that complexes 1a and 1b possessed the highest activities. In comparison, complexes 2a, 2b, 3, and the related biscarbene Ni(II) complex Ni(IPr)2Cl2 [IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene] exhibited moderate
通式[R 2 im] [Ni(PPh 3)Cl 3 ]的新型离子Ni(II)配合物(R 2 im = 1,3-双(2,6-二异丙基苯基)咪唑鎓阳离子,IPrim,1a; R 2通过Ni(PPh 3)2 Cl 2与1当量的直接反应,可以容易地以高收率制备im = 1,3-二异丙基咪唑鎓阳离子,i Prim,2a)。的Ñ,Ñ '-dihydrocarbylimidazolium盐,[R 2 IM]氯。他们的溴化物类似物[R 2 im] [Ni(PPh 3)Br 3 ](R2 im = IPrim, 1b ; 在过量的NaBr存在下,通过相同的反应合成R 2 im = i Prim, 2b)。Ni(DME)Cl 2(DME =1,2-二甲氧基乙烷)与2当量 [IPrim] Cl的形成导致几乎定量地形成复合物[IPrim] 2 [NiCl 4 ](3)。所有这些配合物均通过元素分析,电喷雾电离质谱(ESI-MS)和1