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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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