N-(2,5-difluorophenyl)benzenesulfonamide

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

Conditions: temp:96.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 310 ml of acetic acid diluted with 160 ml of water are added: 1.5 g of sodium nitrite, 0.16 mole (42 g) of 2,5-difluoro-N-benzenesulphonylaniline prepared in the previous stage and 0.94 mole (39 ml) of nitric acid (d=1.52). The reaction mixture is heated to 96° C. for 1 hour. After cooling it is poured onto 1 kg of ice and water. The expected product precipitates. After being filtered off and washed to neutrality it is recrystallized from 250 ml of acetic acid; it melts at 176° C. are added After cooling it The expected product precipitates After being filtered off washed is recrystallized from 250 ml of acetic acid

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 0.194 mole (25 g) of 2,5-difluoroaniline is added to 125 ml of pyridine. 0.2 mole (25.5 ml) of benzenesulphonyl chloride is added, while the temperature is between 35° C. and 45° C. The temperature is maintained at 40° C. for 1 hour after the addition is completed, and then the reaction mixture is poured onto 1 kg of ice and water to which 100 ml of concentrated hydrochloric acid have been added. The expected product precipitates. After filtration and washing, it is treated with a normal sodium hydroxide solution in order to remove insoluble material. The soda-containing filtrate is neutralized with concentrated hydrochloric acid. The expected product, which has precipitated, is filtered off, washed to neutrality and recrystallized from acetic acid. It melts at 115° C. is between 35° C. and 45° C after the addition have been added The expected product precipitates After filtration washing it is treated with a normal sodium hydroxide solution in order to remove insoluble material The expected product, which has precipitated is filtered off washed to neutrality recrystallized from acetic acid

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

Conditions: temp:96.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 310 ml of acetic acid diluted with 160 ml of water are added: 1.5 g of sodium nitrite, 0.16 mole (42 g) of 2,5-difluoro-N-benzenesulphonylaniline prepared in the previous stage and 0.94 mole (39 ml) of nitric acid (d=1.52). The reaction mixture is heated to 96° C. for 1 hour. After cooling it is poured onto 1 kg of ice and water. The expected product precipitates. After being filtered off and washed to neutrality it is recrystallized from 250 ml of acetic acid; it melts at 176° C. are added After cooling it The expected product precipitates After being filtered off washed is recrystallized from 250 ml of acetic acid

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 0.194 mole (25 g) of 2,5-difluoroaniline is added to 125 ml of pyridine. 0.2 mole (25.5 ml) of benzenesulphonyl chloride is added, while the temperature is between 35° C. and 45° C. The temperature is maintained at 40° C. for 1 hour after the addition is completed, and then the reaction mixture is poured onto 1 kg of ice and water to which 100 ml of concentrated hydrochloric acid have been added. The expected product precipitates. After filtration and washing, it is treated with a normal sodium hydroxide solution in order to remove insoluble material. The soda-containing filtrate is neutralized with concentrated hydrochloric acid. The expected product, which has precipitated, is filtered off, washed to neutrality and recrystallized from acetic acid. It melts at 115° C. is between 35° C. and 45° C after the addition have been added The expected product precipitates After filtration washing it is treated with a normal sodium hydroxide solution in order to remove insoluble material The expected product, which has precipitated is filtered off washed to neutrality recrystallized from acetic acid

Conditions: temp:96.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 310 ml of acetic acid diluted with 160 ml of water are added: 1.5 g of sodium nitrite, 0.16 mole (42 g) of 2,5-difluoro-N-benzenesulphonylaniline prepared in the previous stage and 0.94 mole (39 ml) of nitric acid (d=1.52). The reaction mixture is heated to 96° C. for 1 hour. After cooling it is poured onto 1 kg of ice and water. The expected product precipitates. After being filtered off and washed to neutrality it is recrystallized from 250 ml of acetic acid; it melts at 176° C. are added After cooling it The expected product precipitates After being filtered off washed is recrystallized from 250 ml of acetic acid

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 0.194 mole (25 g) of 2,5-difluoroaniline is added to 125 ml of pyridine. 0.2 mole (25.5 ml) of benzenesulphonyl chloride is added, while the temperature is between 35° C. and 45° C. The temperature is maintained at 40° C. for 1 hour after the addition is completed, and then the reaction mixture is poured onto 1 kg of ice and water to which 100 ml of concentrated hydrochloric acid have been added. The expected product precipitates. After filtration and washing, it is treated with a normal sodium hydroxide solution in order to remove insoluble material. The soda-containing filtrate is neutralized with concentrated hydrochloric acid. The expected product, which has precipitated, is filtered off, washed to neutrality and recrystallized from acetic acid. It melts at 115° C. is between 35° C. and 45° C after the addition have been added The expected product precipitates After filtration washing it is treated with a normal sodium hydroxide solution in order to remove insoluble material The expected product, which has precipitated is filtered off washed to neutrality recrystallized from acetic acid