The photon is the green reagent par excellence. It is absorbed leaving no residue and induces deep-seated chemical transformations under mild conditions. Reactions via electronic excited states often reach the target via a shorter path than thermal alternatives, with excellent atom economy. Photochemistry also offers a way for the mild generation of highly reactive intermediates such as radicals or ions. This is illustrated by the example of arylation reactions via photo SN1 process, a method that under some aspects rivals Pd-catalyzed reactions.
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Albini, A., Fagnoni, M. (2008). Photochemistry as a Green Synthetic Method. In: Mordini, A., Faigl, F. (eds) New Methodologies and Techniques for a Sustainable Organic Chemistry. NATO Science Series II: Mathematics, Physics and Chemistry, vol 246. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6793-8_13
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