2-(1,1,3-trioxo-1,2-benzothiazol-2-yl)acetonitrile

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

Procedure: To a suspension of N-cyanomethylsaccharin (276 g) in methanol (1000 ml) was added dropwise 28% sodium methoxide (145 ml) over 30 minutes at 5°-10° C. After stirring at 5°-10° C. for 1 hour, 6N HCl (ca. 230 ml) was added dropwise maintaining the temperature at 10°-15° C. The resulting crystals were collected by filtration, washed with water and dried in vacuo at 50° C. for 16 hours to give o-carbomethoxy-N-cyanomethylbenzenesulfonamide, 264 g (78.7%). maintaining the temperature at 10°-15° C The resulting crystals were collected by filtration washed with water dried in vacuo at 50° C. for 16 hours

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

Procedure: To a suspension of N-cyanomethylsaccharin (276 g) in methanol (1000 ml) was added dropwise 28% sodium methoxide (145 ml) over 30 minutes at 5°-10° C. After stirring at 5°-10° C. for 1 hour, 6N HCl (ca. 230 ml) was added dropwise maintaining the temperature at 10°-15° C. The resulting crystals were collected by filtration, washed with water and dried in vacuo at 50° C. for 16 hours to give o-carbomethoxy-N-cyanomethylbenzenesulfonamide, 264 g (78.7%). maintaining the temperature at 10°-15° C The resulting crystals were collected by filtration washed with water dried in vacuo at 50° C. for 16 hours

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

Procedure: To a suspension of N-cyanomethylsaccharin (276 g) in methanol (1000 ml) was added dropwise 28% sodium methoxide (145 ml) over 30 minutes at 5°-10° C. After stirring at 5°-10° C. for 1 hour, 6N HCl (ca. 230 ml) was added dropwise maintaining the temperature at 10°-15° C. The resulting crystals were collected by filtration, washed with water and dried in vacuo at 50° C. for 16 hours to give o-carbomethoxy-N-cyanomethylbenzenesulfonamide, 264 g (78.7%). maintaining the temperature at 10°-15° C The resulting crystals were collected by filtration washed with water dried in vacuo at 50° C. for 16 hours