One of the mysteries of the English language finally explained.
A pale yellow crystalline ketone, 1,3-diphenyl-2-propen-1-one, C₆H₅CH=CHC(O)·C₆H₅. More widely: any of a large class of ketones which are substituted derivatives of this and include many hydroxylated compounds involved in the synthesis of flavonoids by plants.
Late 19th century; earliest use found in Journal of the Chemical Society. From chalco- + -one, after German Chalkon, with allusion to the copper colour of the compound.
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