F[C:2]1[C:7]([C:8]#[N:9])=[C:6]([F:10])[C:5]([C:11]#[N:12])=[C:4]([F:13])[C:3]=1[F:14].[F-].[K+].[CH2:17]([SH:21])[CH2:18][CH2:19][CH3:20].O>C(#N)C>[F:10][C:6]1[C:5]([C:11]#[N:12])=[C:4]([F:13])[C:3]([F:14])=[C:2]([S:21][CH2:17][CH2:18][CH2:19][CH3:20])[C:7]=1[C:8]#[N:9]A 2.0 g amount of tetrafluoroisophthalonitrile and 0.87 g of potassium fluoride were dissolved in 10 ml of acetonitrile. After cooling to a temperature of 0° C., 0.90 g (1.04 ml) of n-butylmercaptan was gradually dropwise added to the mixture and the resultant mixture was stirred at a temperature of 0° C. or less for 12 hours. After 50 ml of water was added to the reaction mixture, the reaction mixture was extracted with chloroform and the extract was then washed with a saturated aqueous sodium bicarbonate solution, followed by drying with anhydrous magnesium sulfate. After distilling off the chloroform, the resultant crude product was distilled in vacuo. Thus, 2.08 g (77% yield) of the desired compound No. 52 was obtained.
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