[NH3:1].C(Cl)Cl.[O:5]1[CH2:8][CH:7]([O:9][C:10]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2[S:18](Cl)(=[O:20])=[O:19])=[O:11])[CH2:6]1>O>[O:5]1[CH2:8][CH:7]([O:9][C:10]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2[S:18]([NH2:1])(=[O:20])=[O:19])=[O:11])[CH2:6]12.5 g of ammonia are passed into a methylene chloride solution of 2-(oxetan-3-oxycarbonyl)phenylsulfonyl chloride (Example H6) at a temperature of 0° to 5° C. in the course of 45 minutes. By adding water to the reaction mixture, washing the organic phase with water, drying and evaporating it and crystallising the residue from a methylene chloride/diethyl ether mixture, 6.7 g of 2-(oxetan-3-oxycarbonyl)phenylsulfonamide of melting point 169° to 170° C. are obtained.
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