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19.5 Conclusions and Future Perspectives

DOI: 10.1055/sos-SD-229-00329

Albero, J.; García, H.Science of Synthesis: Photocatalysis in Organic Synthesis, (20181606.

As is evident from the state-of-the-art as outlined in this chapter, there is still much room for the application of novel heterogeneous photocatalysts for the photocatalytic synthesis of organic compounds. The majority of the reactions reported so far are oxidations; however, the selectivity of these processes is often unsatisfactory, mainly because the primary products undergo subsequent oxidation, in some cases at higher rates than the starting materials. Not surprisingly, the main use of heterogeneous photocatalysis to date has involved the mineralization and complete degradation of organic compounds. However, besides this so-called “negative” photocatalysis, sufficient examples are shown herein to indicate that there is a chance to synthesize some useful chemicals in a selective way, although conversions are frequently not complete. Given that in photocatalysis the most common general event is charge separation, aside from oxidation reactions that are performed in the presence of oxygen as an electron-trapping agent, reduction reactions that make use of the electrons in the conduction band are another type of general organic reaction that can be promoted by solid photocatalysts. However, reductions have been much less studied than oxidations.

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