Methanol → Difenzoquat metilsulfate
Reaktionsgleichung
[CH3:1][N:2]1[C:6]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)=[CH:5][C:4]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[N:3]1.[CH3:19]O.[S:21](=[O:25])(=[O:24])([OH:23])[OH:22]>>[CH3:19][O:24][S:21]([O-:23])(=[O:22])=[O:25].[CH3:1][N+:2]1[N:3]([CH3:19])[C:4]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[CH:5][C:6]=1[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1Komponenten
4
Versuchsvorschrift
46.8 g (0.2 mol) of 1-methyl-3,5-diphenylpyrazole together with 40 g (1.25 mol) of methanol are introduced into the reaction vessel. After 20.4 g (0.2 mol) of 96% strength sulfuric acid have been added, the reaction solution is brought to 160° C. by distilling off methanol. 640 g (20 mol) of methanol are metered in below the surface of the liquid in the course of 10 hours. After the reaction mixture has cooled, 73.5 g of a solidified melt are obtained. Recrystallization from 10 g of dichloromethane gives 67.7 g of 1,2-dimethyl-3,5-diphenylpyrazolium methylsulfate with a content of 99.4; (HPLC) of m.p. 158°-160° C., which corresponds to a yield of 93.4% of theory.