Salicylamide → 2,2-dimethyl-3,4-dihydro-2H-1,3-benzoxazin-4-one

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A 500-ml flask was charged with 250 ml of chloroform, 27.4 g (0.2 mol) of salicylamide, 23.2 g (0.4 mol) of acetone and 2.7 g of toluene sulfonic acid monohydrate. The flask was equipped with a Soxhlet extraction vessel containing 36.7 g of molecular sieves (Linde Type 3A, 1/16 inch) in the thimble. The reaction mixture was refluxed for 24 hours. Then fresh sieves were placed in the Soxhlet and 10 g of acetone was added to the reaction mixture. Reflux was continued for 24 hours.

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