| abstract |
The invention provides a halide for halogenation, wherein the halide is used for providing halogen in the halogenation, the halide comprises any one of compounds shown in formula I, formula II or formula III, R groups in the formula I, formula II and formula III comprise any one of hydrogen, halogen, alkyl, aryl or nitro, X comprises any one of F, Cl, Br or I, and M + Comprising tetraalkylammonium cations, Li + 、Na + 、K + 、Rb + And Cs + Any one of them. The invention also provides a preparation method of the halide, a composition for preparing the halide and a method for preparing a corresponding product by reacting the halide with a to-be-halogenated substance. The invention can realize halogenation of the compound at normal temperature without additives, thereby obtaining products with high yield and high chemical selectivity, and because byproducts generated after the corresponding reaction of the halogenated compounds are easy to dissolve in water, the corresponding products are easy to separate and purify. |