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Under an inert atmosphere, 225 g of acetic acid was put into a 500 ml three-necked flask, and 24.3 g of 5-t-butyl-m-xylene was added. Then, after adding 31.2 g of bromine, it was reacted at 15-20° C. for 3 hours. The reaction liquid was added to 500 ml of water, and the deposited precipitate was filtrated. It was washed with 250 ml of water twice and 34.2 g of white solid was obtained.

1. customwas reacted at 15-20° C. for 3 hours
2. customThe reaction liquid
3. filtrationthe deposited precipitate was filtrated
4. washIt was washed with 250 ml of water twice