Cl.[NH2:2][OH:3].[CH3:4][C:5]1[CH:17]=[C:16]([CH3:18])[C:15]([O:19][CH3:20])=[C:14]2[C:6]=1[C:7]1[CH2:8][CH2:9][CH2:10][CH2:11][C:12]=1[CH:13]2[CH2:21]C=O>C(O)C.C(Cl)(Cl)Cl.C(Cl)(Cl)Cl>[CH3:4][C:5]1[CH:17]=[C:16]([CH3:18])[C:15]([O:19][CH3:20])=[C:14]2[C:6]=1[C:7]1[CH2:8][CH2:9][CH2:10][CH2:11][C:12]=1[CH:13]2[CH:21]=[N:2][OH:3]500 Milligrams of hydroxylamine hydrochloride was added to an ethanol-chloroform (5:1) solution containing 910 mg of 5,7-dimethyl-8-methoxy-9-formylmethyl-1,2,3,4-tetrahydro-9H-fluorene in 18 ml of ethanol-chloroform and the mixture was refluxed with heating for 2 hours. The reaction mixture was diluted with chloroform and then washed with saturated aqueous sodium chloride solution and subsequently the solvent was distilled off. The residue was purified by a silica gel column chromatography (eluent: ethyl acetate:n-hexane=1:10) to obtain 670 mg of 5,7-dimethyl-8-methoxy-9-hydroxyiminomethyl-1,2,3,4-tetrahydro-9H-fluorene
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