[ClH:1].[CH:2]([NH:5][C:6]1[O:11][C:10](=[O:12])[C:9]2[C:13]([CH3:17])=[CH:14][CH:15]=[CH:16][C:8]=2[N:7]=1)([CH3:4])[CH3:3].C(OCC)C>O1CCOCC1>[ClH:1].[CH:2]([NH:5][C:6]1[O:11][C:10](=[O:12])[C:9]2[C:13]([CH3:17])=[CH:14][CH:15]=[CH:16][C:8]=2[N:7]=1)([CH3:4])[CH3:3]A twofold stoichiometric excess of 3% hydrogen chloride in dioxane is added to a solution of 1.0 g. of 2-isopropylamino-5-methyl-4H-3,1-benzoxazin-4-one in 20 ml dioxane. Diethyl ether is added until precipitation is complete. The product is filtered, washed with ether, air dried and recrystallized to give 2-isopropylamino-5-methyl-4H-3,1-benzoxazin-4-one hydrochloride.
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