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Intramolecular [2+2] Photocycloaddition and Cycloreversion of Ferulic Acid Derivatives
Maeda, Hajime,Nishimura, Keisuke,Yokoyama, Akihiro,Sugimoto, Akira,Mizuno, Kazuhiko,Hosoda, Asao,Nomura, Eisaku,Taniguchi, Hisaji Korean Society of Photoscience 2015 Rapid communication in photoscience Vol.4 No.1
Intramolecular photocycloaddition of ferulic acid derivatives proceeded in high yields to give head-to-head intramolecular photodimers as three atropisomers. The photocycloaddition was sensitized by triplet sensitizers such as benzophenone, whereas photocycloreversion was promoted by 9,10-dicyanoanthracene (DCA) as an electron-transfer photocatalyst. On the other hand, intermolecular photocycloaddition afforded a head-to-tail photodimer.