[N+:1]([O-:4])([OH:3])=[O:2].[Cl:5][C:6]1(Cl)[N:10]([CH3:11])[CH2:9][CH2:8][N:7]1[CH3:12]>>[N+:1]([O-:4])([O-:3])=[O:2].[CH3:12][NH+:7]1[CH2:8][CH2:9][N:10]([CH3:11])[CH:6]1[Cl:5]2.34 g (24.1 mmol) of a 65% nitric acid are added with vigorous stirring to 3.77 g (22.3 mmol) of 2,2-dichloro-1,3-dimethylimidazolidine. This reaction mixture is evacuated firstly at room temperature for one hour at 4 kPa and for 20 min at 7 Pa. After cooling using an ice bath, the mixture is evacuated again for 6 hours at 7 Pa, giving 3.7 g of 1,3-dimethyl-2-chloroimidazolidinium nitrate as an oil, corresponding to a yield of 85.1%.
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