Acetonitrile → 2-(4-fluorophenyl)-2-(N,N-dimethylamino)acetonitrile

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Into a 1 l four-necked flask equipped with a thermometer, a stirrer and a dropping funnel, 49.6 g (0.4 mol) of 4-fluorobenzaldehyde and 480 ml of acetonitrile were charged, and a solution comprising 29.4 g (0.64 mol) of sodium cyanide, 81.6 g (1 mol) of dimethylamine hydrochloride and 200 ml of water, was dropwise added over a period of 15 minutes at from 20 to 30° C. with stirring, and then reacted at the same temperature for 18 hours. After completion of the reaction, the mixture was subjected to liquid separation. The organic layer was separated, and acetonitrile was distilled off. The residue was extracted with 400 ml of ethyl acetate, washed with a 5% sodium hydrogen carbonate aqueous solution and water, and then dried over anhydrous sodium sulfate. Ethyl acetate was distilled off, and the obtained oily substance was distilled under reduced pressure to obtain 64.5 g (yield: 90.5%) of the desired compound (boiling point: 100-101° C./1 KPa). The NMR spectrum data thereof are as follows.

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