Scheme 1From: Design and preparation of Fe3O4@PVA polymeric magnetic nanocomposite film and surface coating by sulfonic acid via in situ methods and evaluation of its catalytic performance in the synthesis of dihydropyrimidines(a) Preparation of: Fe3O4@PVA-SO3H and (b) the synthesis of DHPMs 4a–w in the presence of Fe3O4@PVA-SO3HBack to article page