Research progress on photocatalysis for selective transfer hydrogenation of organic compounds
In recent decades,the development of photocatalysis has opened up new paths for the efficient utilization of energy.Transfer hydrogenation based on photocatalysis offers advantages such as the absence of gaseous hydrogen,mild reaction conditions,reliance on clean and renewable energy sources,and controllable reaction processes.In this paper,research progress in recent years on photocatalysis for selective transfer hydrogenation of organic compounds is reviewed.Firstly,the mechanism of photocatalytic transfer hydrogenation is presented.Secondly,based on the different functional groups being hydrogenated,the research achievements of various photocatalysts and reaction systems are summarized and the reaction mechanism of typical catalytic systems is explained.New hydrogenation systems and ways of substrate valorization are also introduced.Finally,it is pointed out that photocatalytic hydrogenation still encounters challenges such as low reaction rate and low quantum efficiency,limited photocatalysts suitable for visible light,incompatible to traditional reactors,and the use of power-consuming simulated light sources.In this regard,the prospects including the combination of photocatalysis and electrocatalysis,the development of new photocatalysts,the design of reactors suitable for photocatalysis,and the direct utilization of solar energy for photocatalysis,are made.
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