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Issue 7, 2018
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Tungstate catalysis: pressure-switched 2- and 6-electron reductive functionalization of CO2 with amines and phenylsilane

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Abstract

An efficient and environmentally benign tungstate catalyst for reductive functionalization of CO2 with amines and phenylsilane was developed. By simply varying the pressure, 2-electron or 6-electron reduction of CO2 was successfully achieved with simultaneous C–N bond formation, thus leading to the formation of formamides and methylamines, respectively. That is, secondary and primary amines furnished the corresponding methylamines or dimethylamines in excellent yields under atmospheric pressure of CO2, while various formamides were formed in yields ranging from 52% to 98% when increasing the CO2 pressure to 2 MPa. 1H NMR studies and control experiments demonstrate that N-formylation proceeds through the formation of silyl formate, while N-methylation proceeds through an aminal intermediate generated by 4-electron reduction of CO2.

Graphical abstract: Tungstate catalysis: pressure-switched 2- and 6-electron reductive functionalization of CO2 with amines and phenylsilane

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Publication details

The article was received on 12 Nov 2017, accepted on 21 Feb 2018 and first published on 21 Feb 2018


Article type: Paper
DOI: 10.1039/C7GC03416D
Citation: Green Chem., 2018,20, 1564-1570
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    Tungstate catalysis: pressure-switched 2- and 6-electron reductive functionalization of CO2 with amines and phenylsilane

    M. Wang, N. Wang, X. Liu, C. Qiao and L. He, Green Chem., 2018, 20, 1564
    DOI: 10.1039/C7GC03416D

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