ChemInform Abstract: Specific Photoreactions of Flavanones Typical of n,π* and π,π* Characters in Lowest Triplet States.

Abstract

In a poor H‐atom donating solvent, such as benzene, most of the Flavanones (II) undergo photochemical ring opening to give the 2′‐hydroxychalcones (I) as the major products on irradiation with 313‐366nm light.