Alcohol Etherification via Alkoxy Radicals Generated by Visible-Light Photoredox Catalysis.

The regioisomer distribution observed in the formation of chromanes 3n – 3q and 3t – 3t′ does not suggest that there is a clear trend coupled to stereoelectronic effects; however, carbon migration is more likely to occur than oxygen migration for the electron-deficient derivatives 3o – 3p . 25a Accordingly, the regioisomeric ratio obtained for these compounds most probably reflect the 1,5- vs 1,6-addition preferences for these compounds.

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