The photochemistry of the host-guest complex. VII. The photoreaction of dicyanopyrazine derivatives having a crown ether moiety.

M Tada, H Hamazaki, H Hirano

Index: Tada, Masaru; Hamazaki, Hirohide; Hirano, Hideki Bulletin of the Chemical Society of Japan, 1982 , vol. 55, # 12 p. 3865 - 3869

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Citation Number: 13

Abstract

The irradiation of 4′-(5, 6-dicyano-2-pyrazinyl) benzo-15-crown-5 and 5, 6-dicyano-2-(3, 4- dimethoxyphenyl) pyrazine in the presence of a tertiary or secondary amine caused reductive decyanation to give 5-decyano derivatives, which in turn gave bis (decyano) derivatives on further irradiation. Free-energy changes upon single-electron transter from the amine to the excited state of dicyanopyrazine derivatives are exothermic for ...