Reaction-phase-selective inter- and intramolecular photochemical reaction of 2-pyridone derivatives.
Phase-selective photochemical reaction of 2-pyridone derivatives was examined. Irradiation of 1 in benzene mainly gave rearrangement products 2. However, intermolecular [4 + 4] photocycloaddition proceeded quantitatively in the solid state, affording photodimers 3. An effective pi-pi stacking and dipole-dipole interaction between two pyridone moieties might play important roles in an effective arrangement of 1 for photodimerization in their crystal structures. [reaction: see text]
Department of Materials Technology, Faculty of Engineering and Chemical Analysis Center, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan. kohmoto@faculty.chiba-u.jp
Shigeo
S
Kohmoto
Takao
T
Noguchi
Hyuma
H
Masu
Keiki
K
Kishikawa
Makoto
M
Yamamoto
Kentaro
K
Yamaguchi