Heterogeneous catalyst:: Amberlyst-15 catalyzes the synthesis of 14-substituted-14H-dibenzo[a,j]xanthenes under solvent-free conditions

A one-pot condensation of P-naphthol with aldehydes in the presence of Amberlyst-15 to give 14-substituted-14H-di-benzo-[a,j]xanthenes under solvent-free condition is described. (c) 2006 Elsevier Ltd. All rights reserved.