Abstract The synthesis of two new dihydroxy phenacylidene triphenylphosphoranes from 2, 4-dibenzoyloxy and 2, 5-dibenzoyloxy acetophenones is described. By acylation of the hydroxyl groups of theses ylids, intramolecular of the esters carbonyl group and hydrolysis of the second esters group, some 6-hydroxy and 7-hydroxy chromones are prepared with good yields.
