[OH-].[K+].[C:3]([C:5]1[CH:6]=[C:7]2[C:12](=[CH:13][CH:14]=1)[C:11]([C:15]([O:17]C)=[O:16])=[C:10]([OH:19])[CH:9]=[CH:8]2)#[N:4].Cl>O.CO>[C:3]([C:5]1[CH:6]=[C:7]2[C:12](=[CH:13][CH:14]=1)[C:11]([C:15]([OH:17])=[O:16])=[C:10]([OH:19])[CH:9]=[CH:8]2)#[N:4]A solution prepared by dissolving 71 g of potassium hydroxide in 1.5 liter of water was added to a solution prepared by dissolving 24.0 g of 6-cyano-1-methoxycarbonyl-2-naphthol in 4.7 liters of methanol, followed by stirring at 50°-60° C. for 24 hours. After cooling, the reaction mixture was made to an acidic solution with addition of 10% hydrochloric acid. The precipitate was collected by filtration and washed with a small amount of water to obtain 14.8 g of the desired product.
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