反应详情

1,3-Dibromo-5,5-dimethylhydantoin (86.9 g, 0.298 mol) was added in about 5 g portions to a solution of p-nitrocumene (X) (100 g, 0.581 mol, GC purity 96%) and sulphuric acid (178 g, 1.743 mol, 98% strength) over a period of 5 hours. The mixture was then warmed to room temperature and stirred for another 1 hour. The reaction mixture was poured onto 200 g of ice water and admixed with sodium bisulphite (15.1 g, 0.06 mol) and toluene (300 g). The phases were then separated. The organic phase was washed with 5% strength aqueous sodium hydroxide and the toluene was distilled off under reduced pressure. 2-Bromo-1-isopropyl-4-nitrobenzene (147 g, 93.6 GC-% by area, 97% of theory) was obtained as a pale yellow oil.

1. customThe phases were then separated
2. washThe organic phase was washed with 5% strength aqueous sodium hydroxide
3. distillationthe toluene was distilled off under reduced pressure