A new heterogeneous catalyst of triple superphosphate/titanium tetrachloride is used for the synthesis of 1,8-dioxooctahydroxanthenes and tetrahydrobenzo[b]pyrans

Abstract

We have synthesized titanium phosphate (TiCl4/TSP) using a simple impregnation method and characterized by FT-IR, XRD, SEM, and EDX techniques. The catalytic activity of the catalyst was explored in the synthesis of tetrahydrobenzo[b]pyrans and 1,8-dioxooctahydroxanthenes derivatives under environmentally friendly conditions. The products were synthesized in excellent yields (90–97%) within 5–15 min. The catalyst is stable for up to five consecutive cycles without a significant loss of catalytic reactivity.