Title: Visible light-driven C−H activation and C−C coupling of methanol into ethylene glycol

Authors: Shunji Xie, Zebin Shen, Jiao Deng, Pu Guo, Qinghong Zhang, Haikun Zhang, Chao Ma, Zheng Jiang, Jun Cheng, Dehui Deng & Ye Wang

Abstract:

The development of new methods for the direct transformation of methanol into two or multi-carbon compounds via controlled carbon–carbon coupling is a highly attractive but challenging goal. Here, we report the first visible-light-driven dehydrogenative coupling of methanol into ethylene glycol, an important chemical currently produced from petroleum. Ethylene glycol is formed with 90% selectivity and high efficiency, together with hydrogen over a molybdenum disulfide nanofoam-modified cadmium sulfide nanorod catalyst. Mechanistic studies reveal a preferential activation of C−H bond instead of O−H bond in methanol by photoexcited holes on CdS via a concerted proton–electron transfer mechanism, forming a hydroxymethyl radical (CH₂OH) that can readily desorb from catalyst surfaces for subsequent coupling. This work not only offers an alternative nonpetroleum route for the synthesis of EG but also presents a unique visible-light-driven catalytic C−H activation with the hydroxyl group in the same molecule keeping intact.

Full-Link: https://www.nature.com/articles/s41467-018-03543-y