[C:1]([O-:9])(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:10]([OH:12])[CH3:11].[OH-].[K+].Cl>O>[CH2:10]([O:12][C:5]1[CH:6]=[CH:7][C:2]([C:1]([OH:9])=[O:8])=[CH:3][CH:4]=1)[C:11]#[C:1][C:2]#[C:3][CH2:4][CH2:5][CH2:6][CH3:7]In a flask were placed 4.0 g (0.014 mole) of the benzoate derivative obtained and 18 ml of ethanol and while stirring the mixture at room temperature, an aqueous solution composed of 2.0 g (0.36 mole) of potassium hydroxide and 20 ml of water was added to the mixture. After stirring the mixture for 24 hours at 40° C. Twenty (20) ml of water was added to the mixture followed by ice-cooled. When the reaction mixture was acidified with concentrated hydrochloric acid, white crystals formed. The crystals were recovered by filtration, washed with water, and dried. Thus, 3.2 g (yield 89.3%) of the desired product could be obtained. The melting point was 165°-166° C.
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