Abstract
The author of the present paper and other investigators have concluded as the results of their investigations that the red pigments obtained as the result of careful reduction of the yellow flavonol derivatives are identical with the natural anthocyans of plants. Prof. Willstätter, on the other hand, holds that these artifically produced red pigments are different from the natural anathocyans. That the point at issue is important may be judged from the facts that, the complete synthesis of flavonol derivatives having been realised by Kostanecki, the production of anthocyans from them as described by the author ( loc. cit. ), Watson and Sen, and Combes, completes the synthetic production of these compounds. Moreover, the production of anthocyan glucosides-anthocyanins -from yellow glucosides of the flavonol series by reduction in acid solution as described by the author ( loc. cit. ), is of vital interest to those studying the production of these pigments in plants.
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