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an excited-state alkene and ground-state carbonyl compound was first reported less than a decade ago and remains relatively underdeveloped. We report herein a visible light induced photocatalytic approach towards transposed Paternò-Büchi cycloadditions. This strategy involves the use of a photosensitizer that is capable of engaging in selective triplet energy transfer to the alkene component in preference to its carbonyl reaction partner. These more general reaction conditions have enabled a thorough investigation of the synthetic opportunities afforded by the transposed Paternò-Büchi reaction.
Fiala et al. (Tue,) studied this question.