Abstract
A heterogeneous solid acid catalyst has been prepared by covalent grafting of chlorosulphonic acid on the surface of sawdust (SD-OSO3H). The structure of the prepared catalyst was assessed by FT-IR, solid state CP/MAS 13C-NMR spectroscopy, field emission scanning electron microscopy and energy dispersive X-ray. The catalytic performance of the solid acid catalyst has been evaluated in the synthesis of 1,8-dioxo-octahydroxanthenes and 1,8-dioxo-decahydroacridines. High conversion, shorter reaction time, cleaner reaction profile, environmentally benign solvent, simple experimental and work-up procedure, and reusability of catalyst are the striking features of our synthetic route.
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