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

The irradiation of chromone-2-carboxylic esters resulted in the stereo- and regioselective formation of C2 chiral anti-HH 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.

色酮-2-羧酸酯（chromone-2-carboxylic esters）经辐照后，可从其三重激发态（triplet excited state）出发，立体选择性且区域选择性地生成具有C2手性的anti-HH二聚体。与之相反，固态光解（photolysis）仅生成anti-HT二聚体，其生成过程完全受晶体中的分子排列调控。