A mixture of concentrated sulphuric acid, an organic acid, and hydrogen peroxide converts many polyhalogenated-N-heteroaromatic compounds into their N-oxides in good yield. The scope and limitations as well as the mode of action of this reagent are discussed. The use of a mixture of hydrogen peroxide and polyphosphoric acid for N-oxidation of certain polyhalogeno-N-heteroaromatic compounds is also
浓
硫酸,有机酸和
过氧化氢的混合物以高收率将许多多卤代的N-杂芳族化合物转化为N-氧化物。讨论了该试剂的范围和局限性以及作用方式。还描述了使用
过氧化氢和多
磷酸的混合物对某些多卤代-N-杂芳族化合物进行N-氧化。报道了五
氯吡啶鎓离子中亲核取代的实例。