A series of formyl derivatives of Coumarins have been synthesized by Duff formylation method, in this method hydroxyl Coumarins was reacted with hexamethylene tetramine (HMTA) in presence of tri-fluoroacetic acid (TFAA) under microwave irradiation techniques. The structures of all synthesized compounds were confirmed by IR, NMR, Mass and CHN analysis. This is a newly developed efficient synthesis of formyl Coumarins under microwave irradiation technique by Duff formylation method.
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