1-Arylethanones and related compounds are brominated in dioxane with the H2O2-HBraq system, resulting in the replacement of two hydrogen atoms in the methyl group with bromine. The reaction is also accompanied by bromination of the aromatic ring provided that the latter contains electron-donating substituents. The reaction proceeds rapidly (20 min) and results in complete conversion of ketones to give 2,2-dibromo-1-arylethanones in yields up to 86%.
1-芳基乙酮及相关化合物在
二噁烷中使用
H2O2-HBraq体系
溴化,导致甲基中的两个氢原子被
溴取代。只要芳环中含有电子供体取代基,反应还伴随芳环的
溴化。该反应进行迅速(20分钟),并使酮完全转化,生成的2,2-二
溴-1-芳基乙酮的产率高达86%。