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Succinimide-N-sulfonic acid as an efficient Brönsted acid catalyzed the synthesis of pyrano[4,3-b]pyrans by using solar energy as a green source of energy under solvent-free conditions. This method has the advantages of high yield, short reaction time, and clean and simple methodology. The catalyst could be recycled without significant loss of activity.
The authors are thankful to the financial support from University Malaya to Project GC 001A-14-AET.
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