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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Conformation change significantly affected the optical and electronic properties of arylsulfonamide-substituted
Takashi Takeda1, Tomoyuki Akutagawa1
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai, 980-8577, Japan. takashi@tohoku.ac.jp.
Abstract:
Drastic changes in the optical and electronic properties of arylsulfonamide-substituted anthraquinones were induced by simple N-methylation. N-Methylation at the congested peri-position of the anthraquinone unit induced a drastic conformational change from a coplanar arrangement to an orthogonal relationship between the anthraquinone scaffold and arylsulfonamide substituents. As a result, the contribution of the substituents on the anthraquinone unit was spectroscopically suppressed, as demonstrated by UV-Vis absorption spectra and cyclic voltammograms.
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