Issue 20, 2021

Chemo- and regioselective hydroformylation of alkenes with CO2/H2 over a bifunctional catalyst

Abstract

As is well known, CO2 is an attractive renewable C1 resource and H2 is a cheap and clean reductant. Combining CO2 and H2 to prepare building blocks for high-value-added products is an attractive yet challenging topic in green chemistry. A general and selective rhodium-catalyzed hydroformylation of alkenes using CO2/H2 as a syngas surrogate is described here. With this protocol, the desired aldehydes can be obtained in up to 97% yield with 93/7 regioselectivity under mild reaction conditions (25 bar and 80 °C). The key to success is the use of a bifunctional Rh/PTA catalyst (PTA: 1,3,5-triaza-7-phosphaadamantane), which facilitates both CO2 hydrogenation and hydroformylation. Notably, monodentate PTA exhibited better activity and regioselectivity than common bidentate ligands, which might be ascribed to its built-in basic site and tris-chelated mode. Mechanistic studies indicate that the transformation proceeds through cascade steps, involving free HCOOH production through CO2 hydrogenation, fast release of CO, and rhodium-catalyzed conventional hydroformylation. Moreover, the unconventional hydroformylation pathway, in which HCOOAc acts as a direct C1 source, has also been proved to be feasible with superior regioselectivity to that of the CO pathway.

Graphical abstract: Chemo- and regioselective hydroformylation of alkenes with CO2/H2 over a bifunctional catalyst

Supplementary files

Article information

Article type
Paper
Submitted
18 nov. 2020
Accepted
17 déc. 2020
First published
19 déc. 2020

Green Chem., 2021,23, 8040-8046

Chemo- and regioselective hydroformylation of alkenes with CO2/H2 over a bifunctional catalyst

K. Hua, X. Liu, B. Wei, Z. Shao, Y. Deng, L. Zhong, H. Wang and Y. Sun, Green Chem., 2021, 23, 8040 DOI: 10.1039/D0GC03913F

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