Cl.[CH2:2]([O:5][NH2:6])[CH:3]=[CH2:4].[OH-].[Na+].[C:9]([C:14]1[C:15](=[O:30])[CH2:16][CH:17]([C:21]2[C:26]([CH3:27])=[CH:25][C:24]([CH3:28])=[CH:23][C:22]=2[CH3:29])[CH2:18][C:19]=1[OH:20])(=O)[CH2:10][CH2:11][CH3:12].C(O)C>O>[CH2:2]([O:5][N:6]=[C:9]([C:14]1[C:19](=[O:20])[CH2:18][CH:17]([C:21]2[C:22]([CH3:29])=[CH:23][C:24]([CH3:28])=[CH:25][C:26]=2[CH3:27])[CH2:16][C:15]=1[OH:30])[CH2:10][CH2:11][CH3:12])[CH:3]=[CH2:4]Allyloxyamine hydrochloride (0.72 g) and then a solution of sodium hydroxide (0.25 g) in water (3 ml) were added to a stirred mixture of 2-butyryl-3-hydroxy-5-mesitylcyclohex-2-en-1-one (1.78 g; 5.9 mmole) and 95% ethanol. The progress of the reaction was monitored using thin layer chromatography on silica gel (eluant dichloromethane). On completion of the reaction the ethanol was removed by evaporation using a rotary evaporator and the residue was extracted with dichloromethane. The organic extract was washed with aqueous 5% hydrochloric acid and then with water and dried over anhydrous magnesium sulfate. The solvent was removed by evaporation under reduced pressure using a rotary evaporator to give the product, 2-[1-(allyloxyimino)butyl]-3-hydroxy-5-mesitylcyclohex-2-en-1-one (1.6 g) as an oil.
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