[OH-].[K+].[CH2:3]([C:9]1[S:10][C:11]([C:14]2[CH:23]=[CH:22][C:21]3[C:16](=[CH:17][CH:18]=[C:19]([O:24]C(=O)C)[CH:20]=3)[CH:15]=2)=[N:12][N:13]=1)[CH2:4][CH2:5][CH2:6][CH2:7][CH3:8].O.Cl>C(O)C>[CH2:3]([C:9]1[S:10][C:11]([C:14]2[CH:23]=[CH:22][C:21]3[C:16](=[CH:17][CH:18]=[C:19]([OH:24])[CH:20]=3)[CH:15]=2)=[N:12][N:13]=1)[CH2:4][CH2:5][CH2:6][CH2:7][CH3:8]1.50 g (22.7 mM) of potassium hydroxide was dissolved in 72 ml of ethanol at 60°-65° C. To the solution, 2.90 g (8.18 mM) of 2-hexyl-5-(6-acetoxynaphthalene-2-yl)-1,3,4-thiadiazole was added, followed by stirring for 20 minutes at 60°-65° C. The reaction mixture was poured into 200 ml of iced water and 3 ml of concentrated hydrochloric acid was added thereto to precipitate a crystal. The crystal was recovered by filtration and washed with water to obtain 1.90 g of 2-hexyl-5-(6-hydroxynaphthalene-2-yl)-1,3,4-thiadiazole (Yield: 71.9 %). ##STR138##
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