反应详情

2-Ethoxy-4-trifluoromethyl-benzonitrile (64 g) was dissolved in 750 mL of anhydrous ethanol. The solution was cooled to 0° C. and saturated with hydrogen chloride gas. The reaction flask was then sealed with a Teflon stopper and stirred at room temperature for 11 d. The progress of the reaction was checked every few days, and the solution was saturated again with hydrogen chloride gas. Nitrogen gas was bubbled through the solution to remove excess hydrogen chloride gas. The solvent was removed and the residue was triturated in diethyl ether to afford ethyl 2-ethoxy-4-trifluoromethyl-benzimidate hydrochloride (59.5 g, 67% yield) as white solids.

1. waitThe progress of the reaction was checked every few days
2. customNitrogen gas was bubbled through the solution
3. customto remove excess hydrogen chloride gas
4. customThe solvent was removed
5. customthe residue was triturated in diethyl ether