A kind of preparation method of benzyl bromide a-bromotoluene

The invention provides a kind of preparation method of benzyl bromide a-bromotoluene：In organic solvent, it is bromine source that the bromine that redox reaction discharged occurs under the action of an acid using bromate and bromine anion, benzyl position free radical substitution reaction is carried out with the methylbenzenes shown in Formulas I under the initiation of initiator, the benzyl bromide a-bromotoluene class compound shown in corresponding Formula II is prepared：In Formula II, m represents Br number, m=1 or 2；During m=1, Formula II show benzyl monobromo class compound, during m=2, and Formula II show benzyl dibromo class compound.Present invention reaction is all carried out in organic solvent, and R. concomitans initiator, the selection of free radical substitution reaction is more preferable, the substrate scope of application is wider, and the substituent of substitution toluene both can be electron-withdrawing group, can also be electron-donating group, for strong electron-donating group (such as：Methoxyl group) it can also provide very high yield；Secondly, the present disclosure additionally applies for prepare benzyl dibromo class compound, the high income of product.