Abstract
A mild strategy to form ethylene glycol via photocatalytic C–C coupling of methanol and formaldehyde was developed with high atomic efficiency over M/TiO2 under UV-light irradiation. The presence of both methanol and formaldehyde significantly enhanced the formation of ethylene glycol with selectivity of 80%. A radical reaction mechanism for the photocatalytic C–C coupling of methanol and formaldehyde into ethylene glycol was proposed based on electron spin resonance and isotope labeling experiment as well as quantum chemical calculations.
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