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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 1, Number 1
January 20, 1980 

Direct Photoisomerization of Benzalpyrrolinone and Oxidipyrromethene Models for Bilirubin
Yong-Tae Park, Jung-Ui Hwang
Direct photoisomerizations of benzalpyrrolinones yield the corresponding E-isomers via a singlet state, since no effect of oxygen on the reaction rates was observed. The Z-oxodipyrromethene was photoisomerized to the E-isomer in a degassed system. In an aerobic system the oxodipyrromethene 3 was photoisomerized at the early stage of the reaction and photooxygenated slowly at latter stage of the reaction. For bilirubin, other (possibly Z → E) than self-sensitizing 1O2 reaction should have occurred because of the lack of a solvent effect on the self-sensitized photooxidation reaction rate at the early stage.
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