[N+:1]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[S:10](Cl)(=[O:12])=[O:11])([O-:3])=[O:2].[CH2:14]([NH:16][CH2:17][CH3:18])[CH3:15].Cl.C(NCC)C>O1CCCC1>[N+:1]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[S:10]([N:16]([CH2:17][CH3:18])[CH2:14][CH3:15])(=[O:12])=[O:11])([O-:3])=[O:2]To a solution of 132.6 g of o-nitrobenzenesulfonyl chloride in 700 ml of tetrahydrofuran was added 88.5 g of diethylamine at 5°-15°. The reaction mixture was stirred at room temperature for 1 hour before the precipitated diethylamine hydrochloride was removed by filtration. The filtrate was evaporated to dryness in-vacuo and the residue dissolved in 1-chlorobutane. The 1-chlorobutane solution was washed with water, dried over magnesium sulfate and evaporated in-vacuo to give 122.4 g of o-nitro-N,N-diethylbenzenesulfonamide as a dark oil.
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