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In a 500 ml flask equipped with a stirrer and a condenser were charged 32.2 g of ethyl 11-(p-hydroxyphenoxy)undecanoate synthesized in Synthetic example 2, 100 g of a 10% aqueous sodium hydroxide solution and 100 ml of ethanol, and the mixture was refluxed for 2 hours. After completion of the reaction, the reaction mixture was concentrated, poured into 600 ml of a 2% aqueous hydrochloric acid solution and precipitated crystals were collected by filtration. The resulting crystals were washed with distilled water and recrystallized from acetonitrile to obtain 20.2 g of the title compound.

1. customIn a 500 ml flask equipped with a stirrer and a condenser
2. temperaturethe mixture was refluxed for 2 hours
3. customAfter completion of the reaction
4. concentrationthe reaction mixture was concentrated
5. additionpoured into 600 ml of a 2% aqueous hydrochloric acid solution
6. customprecipitated crystals
7. filtrationwere collected by filtration
8. washThe resulting crystals were washed with distilled water
9. customrecrystallized from acetonitrile