4-CHLORO-2-(CHLOROSULFONYL) BENZOIC ACID METHYL ESTER

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

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

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Over a period of 1.5 hours, 243.5 g (3.7 mol) of zinc powder were added a little at a time to a suspension of 205 g (0.75 mol) of methyl 2-chlorosulfonyl-4-chlorobenzoate in 1 l of concentrated hydrochloric acid and 375 g of ice. Stirring was continued for 3 hours, and the mixture was then slowly heated to 70° C. After 2 hours at this temperature, the mixture was cooled. The reaction mixture was allowed to stand at room temperature for 12 hours and then extracted with ethyl acetate, the combined organic phases [lacuna] and the solvent was removed. This gave 125.4 g (83%) of methyl 2-mercapto-4-chlorobenzoate. was continued for 3 hours After 2 hours at this temperature the mixture was cooled to stand at room temperature for 12 hours extracted with ethyl acetate the combined organic phases [lacuna] and the solvent was removed

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Over a period of 1.5 hours, 243.5 g (3.7 mol) of zinc powder were added a little at a time to a suspension of 205 g (0.75 mol) of methyl 2-chlorosulfonyl-4-chlorobenzoate in 1 l of concentrated hydrochloric acid and 375 g of ice. The mixture was stirred for another 3 hours and slowly heated to 70° C. After 2 hours at this temperature, the mixture was cooled. The reaction mixture was allowed to stand at room temperature for 12 hours and then extracted with ethyl acetate, the combined organic phases were dried and the solvent was removed. This gave 125.4 g (83%) of methyl 2-mercapto-4-chlorobenzoate. After 2 hours at this temperature the mixture was cooled to stand at room temperature for 12 hours extracted with ethyl acetate the combined organic phases were dried the solvent was removed