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In a 5 L four-neck flask provided with a thermometer, a Dimroth condenser and an agitator, 3 L of n-butanol and 226 g of potassium hydroxide (85%) (2.72 mol) were charged. The mixture was heated and refluxed to be dissolved. After adding 120 g of the obtained 1-(3,5-bis(methoxycarbonyl)phenyl)-2-(1-adamantyl)ethyne (0.341 mol) therein, the mixture was heated and refluxed for 30 minutes. Next, it was cooled in an ice bath and filtered to obtain precipitated crystal. The crystal was washed with 1 L of ethanol two times followed by drying under pressure at 60° C., thus obtaining 132.49 g of 5-(2-(1-adamantyl)ethynyl) isophthalic acid dipotassium salt (the yield was 97%).

1. customIn a 5 L four-neck flask provided with a thermometer
2. temperatureThe mixture was heated
3. temperaturerefluxed
4. dissolutionto be dissolved
5. temperaturethe mixture was heated
6. temperaturerefluxed for 30 minutes
7. temperatureNext, it was cooled in an ice bath
8. filtrationfiltered
9. customto obtain
10. customprecipitated crystal
11. washThe crystal was washed with 1 L of ethanol two times
12. customby drying under pressure at 60° C.