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. 2012 Oct 8;51(41):10329-32.
doi: 10.1002/anie.201204835. Epub 2012 Sep 10.

Visible light photocatalysis of [2+2] styrene cycloadditions by energy transfer

Zhan Lu  1 , Tehshik P Yoon
Affiliations

Visible light photocatalysis of [2+2] styrene cycloadditions by energy transfer

Zhan Lu et al. Angew Chem Int Ed Engl. .

Abstract

Hip to be square: Styrenes participate in [2+2] cycloadditions upon irradiation with visible light in the presence of an iridium(III) polypyridyl complex. In contrast to previous reports of visible light photoredox catalysis, the mechanism of this process involves photosensitization by energy transfer and not electron transfer.

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Figures

Scheme 1
Scheme 1
Comparison of visible to UV conditions for cycloaddition of 32. [a] 1H NMR analysis against an internal standard revealed 100% consumption of 32.
Scheme 2
Scheme 2
Synthesis of cannabiorcicycloic acid.
See this image and copyright information in PMC

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