[CH3:1][S:2](Cl)(=[O:4])=[O:3].[NH:6]1[CH2:10][CH:9]=[CH:8][NH:7]1.C(N(CC)CC)C>C(Cl)Cl>[CH3:1][S:2]([N:7]1[CH2:8][CH:9]=[CH:10][NH:6]1)(=[O:4])=[O:3]114.5 g of methanesulphonic acid chloride were added dropwise to 70 g of pyrazoline and 101 g of triethylamine in 300 ml of methylene chloride at room temperature. The mixture was subsequently stirred at room temperature for 3 hours and was filtered. The filtrate was washed with water, dried over sodium sulphate and concentrated. 114 g (77% of theory) of methanesulphonylpyrazoline of melting point 62° C. were obtained.
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