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Abstract
In this review, we highlight the use of organic photoredox catalysts in a myriad of
synthetic transformations with a range of applications. This overview is arranged
by catalyst class where the photophysics and electrochemical characteristics of each
is discussed to underscore the differences and advantages to each type of single electron
redox agent. We highlight both net reductive and oxidative as well as redox neutral
transformations that can be accomplished using purely organic photoredox-active catalysts.
An overview of the basic photophysics and electron transfer theory is presented in
order to provide a comprehensive guide for employing this class of catalysts in photoredox
manifolds.
The use of visible light sensitization as a means to initiate organic reactions is attractive due to the lack of visible light absorbance by organic compounds, reducing side reactions often associated with photochemical reactions conducted with high energy UV light. This tutorial review provides a historical overview of visible light photoredox catalysis in organic synthesis along with recent examples which underscore its vast potential to initiate organic transformations.