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Kufer, Werner and Cmiel, Edmund and Thümmler, F. and Rüdiger, W. and Schneider, Siegfried and Scheer, Hugo (1982): STUDIES ON PLANT BILE PIGMENTS. 2. REGIOSELECTIVE PHOTOCHEMICAL AND ACID CATALYZED Z,E ISOMERIZATION OF DIHYDROBILINDIONE AS PHYTOCHROME MODEL. In: Photochemistry and Photobiology, Vol. 36: pp. 603-607
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Abstract

The (4 Z, 10 2, 15Ej-2,3-dihydrobilindione 4, along with the fully unsaturated (E, 2, Z)-analogue 8, has been prepared from the corresponding (Z, Z, Z)-isomer by a variation of Falk's method (Falk et ul., 1980). The photochemical and acid-catalyzed back-reactions have been studied by UV-vis and 'H-NMR spectroscopy.