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Author(s): Vijakumar L Chavan, Vikas V Vaidya and Rajendra R Rane
3-methyl-1H-2-benzopyran-1-one was synthesized in excellent yields by the reaction of homophthalic anhydride with acetyl chloride using pyridine as a catalyst, followed by rearrangement of 4-acetyl-1H-2-benzopyran-1,3(4H)- dione with Conc. Sulphuric acid at high temperature.