[C:1]1([S:7](Cl)(=[O:9])=[O:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH3:11][NH:12][CH3:13].O>C1COCC1>[CH3:11][N:12]([CH3:13])[S:7]([C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1)(=[O:9])=[O:8]A solution of benzenesulfonylchloride (10 ml; 78 mmol) in THF (100 ml) was added a 40% solution of dimethylamine in H2O (20 ml; 160 mmol) such that the reaction temperature was kept below 50° C. The reaction mixture was stirred 1 h at rt. The reaction mixture was added H2O and THF removed by evaporation. The precipitate formed was isolated by filtration and air dried to give 14 g (97%) of N,N-dimethylbenzenesulfonamide.
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