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2.1 Basic Ideas

DOI: 10.1055/sos-SD-229-00002

Gaida, F.; Griesbeck, A. G.; Vollmer, M.Science of Synthesis: Photocatalysis in Organic Synthesis, (201813.

Photochemistry[‌1‌‌8‌] describes chemistry under the action of photons, and photocatalysis describes catalysis under the action of photons.[‌9‌‌11‌] Photons can directly trigger chemical reactions, initiate chain processes, activate stored reactive intermediates, and activate catalysts that function by group transfer (mostly hydrogen), energy transfer, or electron transfer. Organic photochemistry and photocatalysis have proven to be powerful, controllable, and versatile tools for organic synthesis and have systematically been studied since the early days of Italian photochemistry schools (e.g., by Giacomo Ciamician, Emanuele Paternò, and others) in the late 19th century.[‌12‌‌14‌]

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