Clean synthesis of 1,8-dioxo-dodecahydroxanthene derivatives catalyzed by polyaniline-p-toluenesulfonate salt in aqueous media

An efficient and straightforward procedure for the synthesis of 1,8-dioxo-dodecahydroxanthene was achieved through one-pot condensation of arylaldehyde and 1,3-cyclohexanedione in the presence of polyaniline-p-tolulenesulfonate salt as polymeric solid acid catalyst.