C([O:4][C:5]1[CH:17]=[CH:16][C:15]2[C:14]3[C:9](=[CH:10][C:11]([O:18]C(=O)C)=[CH:12][CH:13]=3)[CH:8]([CH3:22])[C:7]=2[CH:6]=1)(=O)C.O.[OH-].[Li+].Cl>C(O)CO>[OH:4][C:5]1[CH:17]=[CH:16][C:15]2[C:14]3[C:9](=[CH:10][C:11]([OH:18])=[CH:12][CH:13]=3)[CH:8]([CH3:22])[C:7]=2[CH:6]=1A mixture of 2,7-diacetyloxy-9-methylfluorene (12 g), lithium hydroxide monohydrate (3.42 g) and ethylene glycol (120 mL) was refluxed for one hour by heating. The reaction mixture was poured into 6M-hydrochloric acid and extracted with ethyl acetate. The organic layer was sufficiently washed with water and then dried on anhydrous magnesium sulfate. The solvent was distilled off from this organic layer under reduced pressure to obtain 2,7-dihydroxy-9-methylfluorene (7.24 g) of light brown crystal. Melting point: 191.5-196.3° C.
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