Synthesis of methylenebis(4-hydroxy-2-pyrone) or methylenebis(4- hydroxycoumarin) derivatives by organic solid state reaction
Methylenebis(4-hydroxy-2-pyrone) or methylenebis(4-hydroxycoumarin) derivatives (5) have been synthesized from 4-hydroxy-2-pyrones or 4- hydroxycoumarin (3) with aldehydes (4) by organic solid state reaction.