Abbauprodukte des Betanidins. 4. (vorläufige) Mitteilung. Über die Konstitution des Randenfarbstoffes Betanin

Abstract

Abstract By degrading betanidin with alkali under exclusion of oxygen it was possible to demonstrate the formation of 4‐methylpyridine‐2, 6‐dicarboxylic acid (II), 2, 3‐dihydro‐5, 6‐dihydroxyindole‐2‐carboxylic acid (IV) and formic acid. Compounds II and IV were also found after a treatment with acid. In this way all the 18 carbon atoms of betanidin are accounted for by degradation.