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woshixuwei

木虫 (小有名气)

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To a stirred solution of 150 g (1.1 mol) of 1,4-dimethoxybenzene (2) in 750 ml of glacial acetic acid, 65 g (2.2 mol) of paraformaldehyde and 425
ml of HBr/AcOH (40%) were added slowly. The reaction mixture
was heated for 1 h at 50°C and hydrolysed in 3000 ml of water
after cooling to room temperature. The residue was filtered off and
suspended in 750 ml of CHCl3.
其中,HBr/AcOH (40%)是怎么制备的,或者能不能买得到……非常感谢啊
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