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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¡ãC and hydrolysed in 3000 ml of water after cooling to room temperature. The residue was filtered off and suspended in 750 ml of CHCl3. ÆäÖУ¬HBr/AcOH (40%)ÊÇÔõÃ´ÖÆ±¸µÄ£¬»òÕßÄܲ»ÄÜÂòµÃµ½¡¡·Ç³£¸Ðл°¡ |
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