Cl.[N:2]1([CH2:8][CH2:9][C:10]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)=O)[CH2:7][CH2:6][CH2:5][CH2:4][CH2:3]1.Cl.[NH2:19][OH:20].C(=O)([O-])O.[Na+].[OH-].[Na+]>O.[Ag]>[N:2]1([CH2:8][CH2:9][C:10](=[N:19][OH:20])[C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH2:7][CH2:6][CH2:5][CH2:4][CH2:3]1In 470 ml of water were dissolved 60.2 g of β-piperidinopropiophenone hydrochloride and 18.1 g of hydroxylamine hydrochloride. To this solution was added portionwise 21.9 g of sodium hydrogencarbonate. After the whole amount was added, the mixture was stirred overnight. To the stirred mixture was then added an aqueous solution of 14.2 g of sodium hydroxide in 47 ml of water. Thus obtained mixture was well stirred and allowed to stand for 2 hours to produce a white precipitate. The precipitate was collected by filtration and washed successively with two portions of 200 ml of water and ethanol. The washed precipitate was dried to obtain a white solid. The solid was then recrystallized from methanol to obtain 41.2 g (yield: 74.8%) of the subject compound as a silver-white scaly product.
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