[C:1]1([S:7]([CH2:10][CH2:11][C:12]#[N:13])(=[O:9])=[O:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.P(Cl)(Cl)[Cl:15].ClCl.[ClH:20]>N1C=CC=CC=1.P(Cl)(Cl)Cl.O>[Cl:20][C:11](=[C:10]([Cl:15])[S:7]([C:1]1[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1)(=[O:8])=[O:9])[C:12]#[N:13]195 g (1 mol) of 3-phenylsulphonyl-propionitrile were melted at 100° C. in a 500 ml four-necked flask and 14 g of PCl3 and 4.2 g of pyridine were added as catalysts. 150 g (2.1 mols) of chlorine at 100° to 90° C. were then introduced during the course of 9 hours. 7 g of PCl3 and 2 g of pyridine were then added once more, and 160 g (2.25 mols) of chlorine was again introduced at 80° C. during the course of 12 hours, a part of the chlorine being entrained with the escaping HCl gas. 200 ml of water were now added dropwise at 20° C., whilst cooling. The phases were separated at 90° C. and the washing operation was repeated with 200 ml of water. In order to eliminate benzenesulphonyl chloride, the mixture was now boiled for 5 hours with 200 ml of water, and the organic phase was separated off and dried in vacuo. 227 g (87%) of a dark brown crude oil was obtained, which solidified on standing overnight. After warming the solid and dissolving it in 50 ml of ethanol, cooling the solution with ice and filtering off the precipitate under suction, 135 g (51%) of pale crystals, melting point 72° C., were obtained.
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