Mechanism of cyclization of substituted 2′-hydroxychalcones to flavanones

The conversion of 2′-hydroxy-(3), 2′,4′-dihydroxy-(4), 2′,3-dihydroxy-(5), and 2′,4-dihydroxy-chalcone (6) in aqueous alkali; and of (3) and 2′-hydroxy-4-nit...