Cellulose sulfuric acid: An efficient biodegradable and recyclable solid acid catalyst for the synthesis of 1-oxo-hexahydroxanthene

Abstract

A series of 1-oxo-hexahydroxanthene derivatives was synthesized at room temperature in solid state from substituted salicylaldehydes and substituted 1,3-hexanediones in the presence of a catalytic amount of cellulose sulfuric acid. The results showed that the reaction performed under solid-state conditions was benign to the environment, with higher yields and more convenient workup.