Exclusive Photodimerization Reactions of Chromone-2-carboxylic Esters Depending on Reaction Media

[摘要]：The irradiation of chromone-2-carboxylic esters resulted in the stereo- and regioselective formation of C-2 chiral anti-HR dimers from the triplet excited state. On the contrary, photolysis in the solid-state gave anti-HT dimers exclusively controlled by molecular arrangement in the crystal

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