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Synthesis, characterization and catalytic activity of nickel NHC complexes
Molecular Catalysis ( IF 3.9 ) Pub Date : 2017-08-16 , DOI: 10.1016/j.mcat.2017.06.033
Agata Włodarska , Jowita Gołaszewska-Gajda , Maciej Dranka , Antoni Pietrzykowski

Several new cyclopentadienylnickel complexes were synthesized and characterized. All the complexes exhibited catalytic activity in Suzuki–Miyaura cross-coupling reaction with conversion rates from 10 to 80% and very high selectivity. The catalytic activity of the complexes strongly depended on their composition and structure. It was shown that ionic complexes are better catalysts than their covalent analogues; increased electron density in the cyclopentadienyl ligand improved their catalytic activity; bromide complexes provided better results than chloride ones.

Two CpNi(NHC)Cl complexes were tested as initiators in the oligomerization of ethyl acetate carbene confirming our earlier observation that N-heterocyclic carbene from the catalyst precursor was incorporated into the oligomer chain.



中文翻译:

镍NHC配合物的合成,表征和催化活性

合成并表征了几种新的环戊二烯基镍配合物。所有的配合物在铃木-宫浦交叉偶联反应中均表现出催化活性,转化率在10%至80%之间,并且具有很高的选择性。配合物的催化活性强烈取决于其组成和结构。结果表明,离子配合物比它们的共价类似物更好。环戊二烯基配体中电子密度的增加改善了它们的催化活性;溴化物配合物比氯化物提供更好的结果。

在乙酸乙酯卡宾的低聚反应中,测试了两种CpNi(NHC)Cl络合物作为引发剂,从而证实了我们较早的观察结果,即来自催化剂前体的N-杂环卡宾被并入了低聚物链中。

更新日期:2017-08-16
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