Synthesis, characterization, and application of cobalt hydrogen sulfate as a new heterogeneous, reusable and efficient catalyst in one-pot synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxooctahydroxanthenes

Abstract

Cobalt hydrogen sulfate is synthesized and characterized by XRD, FTIR and TEM measurements. The efficiency of this readily available, cheap, non-toxic, heterogeneous and reusable catalyst is shown in the one-pot preparation of aryl- and alkyl-14H-dibenzoxanthenes and 1,8-dioxooctahydroxanthene derivatives by cyclocondensation of substituted benzaldehydes and β-naphthol or 5,5-dimethyl-1,3-cyclohexanedione respectively. Among advantages of these methods are high yields, a clean reaction strategy, simple methodology, green conditions and easy workup.