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In 200 ml of N,N-dimethylformamide were dissolved with heating 20 g of 4-hydroxyphthalonitrile and 10.55 g of potassium carbonate, to which 20 g of chloroethyl-trimethylsilane were added dropwise at 40° C. in the atmosphere of argon. Immediately after the addition, the mixture was stirred for 18 hours while maintaining the reaction temperature at 85°-105° C. The reaction vessel was then cooled to room temperature and 250 ml of dilute hydrochloric acid was added. The mixture was extracted with 1.2 liters of toluene. The organic layer was washed well with water and water was removed with magnesium sulfate. Thereafter, toluene was removed by distillation and the residue was purified with a toluene/silica gel column to obtain 24.6 g (yield: 77.0%) of a compound having the formula (XVII) below. ##STR39##

1. additionImmediately after the addition
2. temperaturewhile maintaining the reaction temperature at 85°-105° C
3. extractionThe mixture was extracted with 1.2 liters of toluene
4. washThe organic layer was washed well with water and water
5. customwas removed with magnesium sulfate
6. customThereafter, toluene was removed by distillation
7. customthe residue was purified with a toluene/silica gel column