Highly efficient synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes Catalyzed by carbon-based solid acid under solvent-free conditions

Abstract

Carbon-based solid acid, a strong solid acid catalyst, was prepared readily by sulfonation and carbonization of aromatic compounds such as naphthalene in sulfuric acid at 250°C. This reusable and ecofriendly carbon-based solid acid highly efficiently condensed-naphtol with aromatic aldehydes under solvent-free conditions, and the corresponding aryl-14-H-dibenzo[a,j]xanthenes were obtained in excellent yields. The catalyst can be reused several times without loss of its activity.