首页> 外文期刊>Chemistry: A European journal >Water-soluble Ir~(III) N-heterocyclic carbene based catalysts for the reduction of CO_2 to formate by transfer hydrogenation and the deuteration of aryl amines in water
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Water-soluble Ir~(III) N-heterocyclic carbene based catalysts for the reduction of CO_2 to formate by transfer hydrogenation and the deuteration of aryl amines in water

机译:水溶性Ir〜(III)N-杂环卡宾基催化剂,用于通过转移氢化和芳基胺的氘化将CO_2还原为甲酸

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摘要

Two new water-soluble [IrI_2(AcO)(bis-NHC)] complexes (NHC=N-heterocyclic carbene) incorporating a sulfonate functionality have been synthesized. The two complexes have been tested in the reduction of CO _2 with H_2 and iPrOH, and their activity has been compared with similar species without the sulfonate moiety. In both reactions, the complex with the two abnormally bound NHCs shows the best catalytic efficiencies, due to the higher δ-electron-donor character of the ligand. Remarkably, the activities obtained for the reduction of CO_2 under the transfer hydrogenation conditions are the best reported to date in terms of TON value (max. TON=2700). The two new complexes have also shown very good activity in the selective deuteration of arylamines, a process that is known to proceed through a chelate assisted N-directed process.
机译:合成了两种新的具有磺酸盐官能团的水溶性[IrI_2(AcO)(双-NHC)]络合物(NHC = N-杂环卡宾)。已经测试了这两种配合物在用H_2和iPrOH还原CO _2中的作用,并将它们的活性与没有磺酸盐部分的相似物质进行了比较。在这两个反应中,由于配体具有更高的δ电子给体特性,具有两个异常结合的NHC的配合物显示出最佳的催化效率。值得注意的是,就转移值而言,在转移氢化条件下获得的用于还原CO_2的活性是迄今为止报道得最好的(最大TON = 2700)。两种新的配合物在芳基胺的选择性氘代中也显示出非常好的活性,该过程已知通过螯合辅助的N定向过程进行。

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