3-(benzenesulfonyl)propanenitrile

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 650 ml of water are introduced into the flask and are heated to 80° to 90° C., and 935 g (4 mols) of 70% strength sodium benzenesulphinate are added to the water. 215 g (4.04 mols) of acrylonitrile and 382 g (1.95 mols) of 50% strength sulphuric acid are then added simultaneously, in the course of about 1 hour at 100° C., at such a rate that the pH value remains at 6 to 7. The mixture is stirred for 30 minutes at 100° C. and the pH value is again readjusted. Excess acrylonitrile is distilled off over a Vigreux column in an azeotropic mixture with water at normal pressure, and 255 g of xylene are then added and the phases are separated at about 95° C. This is carried out by sucking off the lower aqueous phase with a suction tube. The salt precipitate remains for the most part in the flask. 800 ml of washing water is now stirred in at >95° C. and the phases are separated as described above. In this process most of the salt is dissolved, and the remainder does not interfere in the following reaction. A further 17 g of 3-phenylsulphonyl-propionitrile are isolated from the combined aqueous phases. 255 g (300 ml) of xylene are now added to the organic phase in the flask, at 95° to 100° C., and the remaining water is distilled off azeotropically with xylene (boiling point 92° C.) The remaining xylene is completely removed in vacuo at a trough temperature of 100° to 120° C. The trough now contains 730 g (94%) of 3-phenylsulphonyl-propionitrile in 97% purity, and 50 g of salt. are heated to 80° to 90° C. Excess acrylonitrile is distilled off over a Vigreux column in an azeotropic mixture with water at normal pressure, and 255 g of xylene are then added the phases are separated at about 95° C 800 ml of washing water is now stirred in at >95° C. the phases are separated In this process most of the salt is dissolved the remainder does not interfere in the following reaction

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 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. whilst cooling The phases were separated at 90° C. the organic phase was separated off dried in vacuo

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 650 ml of water are introduced into the flask and are heated to 80° to 90° C., and 935 g (4 mols) of 70% strength sodium benzenesulphinate are added to the water. 215 g (4.04 mols) of acrylonitrile and 382 g (1.95 mols) of 50% strength sulphuric acid are then added simultaneously, in the course of about 1 hour at 100° C., at such a rate that the pH value remains at 6 to 7. The mixture is stirred for 30 minutes at 100° C. and the pH value is again readjusted. Excess acrylonitrile is distilled off over a Vigreux column in an azeotropic mixture with water at normal pressure, and 255 g of xylene are then added and the phases are separated at about 95° C. This is carried out by sucking off the lower aqueous phase with a suction tube. The salt precipitate remains for the most part in the flask. 800 ml of washing water is now stirred in at >95° C. and the phases are separated as described above. In this process most of the salt is dissolved, and the remainder does not interfere in the following reaction. A further 17 g of 3-phenylsulphonyl-propionitrile are isolated from the combined aqueous phases. 255 g (300 ml) of xylene are now added to the organic phase in the flask, at 95° to 100° C., and the remaining water is distilled off azeotropically with xylene (boiling point 92° C.) The remaining xylene is completely removed in vacuo at a trough temperature of 100° to 120° C. The trough now contains 730 g (94%) of 3-phenylsulphonyl-propionitrile in 97% purity, and 50 g of salt. are heated to 80° to 90° C. Excess acrylonitrile is distilled off over a Vigreux column in an azeotropic mixture with water at normal pressure, and 255 g of xylene are then added the phases are separated at about 95° C 800 ml of washing water is now stirred in at >95° C. the phases are separated In this process most of the salt is dissolved the remainder does not interfere in the following reaction