[CH3:1][C:2]1[CH:3]=[CH:4][C:5]([CH3:8])=[CH:6][CH:7]=1.F[B-](F)(F)F.[CH2:14]([N+]1C=CN(C)C=1)C.[ClH:22]>O>[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[CH:4][C:3]=1[CH2:14][Cl:22]53 g p-xylene, 4.9 g 1-ethyl-3-methylimidazolium tetrafluoroborate and 1.6 g concentrated hydrochloric acid whose concentration is 36% are added into a 500 ml four-neck flask and the temperature is raised to 80˜85° C. after well stirring. And the reaction solution is kept warm tor 0.5 h after the gas of hydrochloride is inflated, and then cooled to the room temperature, standing for layering. The upper layer is organic layer while the lower layer is water layer. The water layer is dehydrated trader vacuum and the gained ionic liquid can be recycled and reused. The organic layer is transferred into a 500 ml four-neck flask and is rectified under vacuum. Alter desolventizing. 70.6 g 2,5-dimethylbenzyl chloride is finally provided (91.3%) yield).
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