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Sequential Hydrogenation of CO2 to Methanol Using a Pincer Iron Catalyst
Methanol is a crucial precursor for the preparation of many high-value commercial chemicals and synthesizing it from an inexpensive and renewable carbon source such as carbon dioxide (CO2) could have significant benefits. Herein, a homogeneous iron(II) pincer complex for the catalytic generation of...
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Published in: | Organometallics 2019-08, Vol.38 (15), p.3084-3091 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
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Summary: | Methanol is a crucial precursor for the preparation of many high-value commercial chemicals and synthesizing it from an inexpensive and renewable carbon source such as carbon dioxide (CO2) could have significant benefits. Herein, a homogeneous iron(II) pincer complex for the catalytic generation of methanol from CO2 and H2 via a two-step process is described. The CO2 reduction process occurs through initial coupling with H2 and an amine to give a formamide. Subsequently, the formamide undergoes catalytic deaminative hydrogenation to afford methanol and regenerate the amine. A net turnover number of 590 is obtained for CO2 and H2 to methanol using this method. The primary obstacle to a single-batch catalytic process is CO2 poisoning of the catalyst in the formamide hydrogenation step, and mechanistic investigations suggest that this CO2 inhibition results from the formation of a stable iron(II) formate complex. |
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ISSN: | 0276-7333 1520-6041 |
DOI: | 10.1021/acs.organomet.9b00413 |