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Neutral-Eosin Y-Catalyzed Regioselective Hydroacylation of Aryl Alkenes under Visible-Light Irradiation

The hydroacylation of styrene derivatives were achieved by employing neutral eosin Y as a direct hydrogen atom transfer (HAT) catalyst under visible-light irradiation. Exclusive anti-Markovnikov selectivity could be obtained. Aldehydes and styrenes with various substituents were tolerated (>20 examples) to achieve products with moderate to high yields. The key acyl radical intermediate was generated from a direct HAT process induced by photo-excited eosin Y. The subsequent addition to styrenes and a reverse HAT process generated the ketone products.