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 C(2) 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.
Sakamoto
Masami
M
Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. sakamotom@faculty.chiba-u.jp
Yagishita
Fumitoshi
F
Kanehiro
Masayuki
M
Kasashima
Yoshio
Y
Mino
Takashi
T
Fujita
Tsutomu
T