Synthesen von Flavon-2′-carbonsäuren und Chromono-(2′,3′-3,4)-isocumarin-derivaten

Synthesis of Flavone-2′-carboxylic Acids and Chromonoisocoumarines When we tried to synthesize 1,2-bischromonylbenzene derivatives from phthalic acid and o-hydroxy-acetophenone derivatives by Baker-Venkataraman-rearrangement flavone-2′-carboxylic acid derivatives are obtained in one step. This is a simple way to get flavone-2′ carboxylic acids and chromonoisocoumarines.