Photocatalytic C−H activation and C−C coupling of monohydric alcohols

Monohydric alcohols, such as methanol, ethanol, are useful chemical building blocks that can be facilely produced from various carbon resources. The direct conversion of alcohols into high-value-added chemicals, in particular diols, is attractive but challenging. Photocatalysis has provided a promising strategy for direct coupling of alcohols to high-value-added chemicals. This article focuses on recent advances in photocatalytic C − C coupling of alcohols, including methanol, ethanol, isopropanol, aromatic alcohols, into diols, such as ethylene glycol, 2,3-butanediol, pinacol, hydrobenzoin. The photocatalysts, performances and reaction mechanisms are discussed for deep understanding of preferential activation of C − H bond of alcohols and C − C coupling to diols. [Display omitted] •Direct transformation of alcohols to chemicals, in particular diols, is important.•Photocatalytic coupling of alcohols to diols has emerged as a promising way.•A novel review for activation of C − H bond of alcohols and C − C coupling to diols.