[CH3:1][O:2][C:3]1[CH:4]=[C:5](/[CH:20]=[C:21](/[CH3:27])\[C:22]([O:24]CC)=[O:23])[C:6]2[C:11]([C:12]=1[O:13][CH2:14][O:15][CH3:16])=[C:10]([CH2:17][CH2:18][CH3:19])[CH:9]=[CH:8][CH:7]=2.[OH-].[K+].Cl>C(O)C>[CH3:1][O:2][C:3]1[CH:4]=[C:5](/[CH:20]=[C:21](/[CH3:27])\[C:22]([OH:24])=[O:23])[C:6]2[C:11]([C:12]=1[O:13][CH2:14][O:15][CH3:16])=[C:10]([CH2:17][CH2:18][CH3:19])[CH:9]=[CH:8][CH:7]=2170 g of ethyl (Z)-3-(3-methoxy-4-methoxymethoxy-5-propyl-1-naphthyl)-2-methylpropenoate was dissolved in 850 ml of ethanol and a potassium hydroxide aqueous solution (potassium hydroxide 60 g/water 120 ml) was added, followed by refluxing for 1 hour. After cooling to 10° C., 2.5N hydrochloric acid was added to make it pH~5, followed by extraction with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and concentrated in vacuo. The resultant crystals were filtered to obtain 151 g of the titled compound as yellow crystals.
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