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This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.We report a catalytic, light-driven protocol for the intramolecular hydroetherification of unactivated alkenols to furnish cyclic ether products. These reactions occur under visible light irradiation in the presence of an Ir(III)-based photoredox catalyst, a Bronsted base catalyst, and a hydrogen atom transfer co-catalyst. Reactive alkoxy radicals are proposed as key intermediates, generated via the direct homolytic ac
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