Abstract

Bhavana Sharma^1*, S. C. Agrawal² and K. C. Gupta³

Chalcones are open analogues of flavonoids and give bright red to purple colours with different reagents which can be used to distinguish them from other flavonoids such as flavanones, flavones, aurones etc. Studies show that the bathochromic shift arises due to the formation of carbonium ion at the carbonyl group (>C = O) of the chromogen (ArCOCH = CHAr) as an intermediate which produces deeper colour during the reaction.

Chalcone; halochromy; benzylideneacetophenone

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