2-bromo-5-fluorobenzenethiol

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

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

Procedure: 76.61 g of 2-bromo-5-fluorothiophenol were dissolved in 740 ml of DMF and 62.23 g of potassium carbonate were added. A solution of 26.07 ml of iodomethane in 130 ml of DMF was then added dropwise at a temperature between 3° C. and 11° C. The reaction mixture was stirred for 3 h at room temperature, then diluted with 3 l of water and extracted four times with 500 ml each of MTB. The combined extracts were dried over sodium sulfate and the solvent was removed in vacuo. 72.71 g of the title compound were obtained as a pale brown oil. extracted four times with 500 ml each of MTB The combined extracts were dried over sodium sulfate the solvent was removed in vacuo

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

Procedure: 51.30 g of S-(2-bromo-5-fluorophenyl) dimethylthiocarbamate were dissolved in 700 ml of MOH, 494 ml of a 1 N aqueous sodium hydroxide solution were added and the reaction mixture was heated for 2 h under reflux. After cooling, the MOH was removed in vacuo, 200 ml of water were added and the mixture was extracted three times with 150 ml each of DCM. Subsequently, the mixture was acidified to pH=1 with concentrated hydrochloric acid and extracted four times with 200 ml each of EA. The combined organic phases were dried over sodium sulfate and the solvent was removed in vacuo. 37.80 g of the title compound were obtained as a pale yellow oil. were added the reaction mixture was heated for 2 h under reflux After cooling the MOH was removed in vacuo, 200 ml of water were added the mixture was extracted three times with 150 ml each of DCM extracted four times with 200 ml each of EA The combined organic phases were dried over sodium sulfate the solvent was removed in vacuo

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

Procedure: 51.30 g of S-(2-bromo-5-fluorophenyl) dimethylthiocarbamate were dissolved in 700 ml of MOH, 494 ml of a 1 N aqueous sodium hydroxide solution were added and the reaction mixture was heated for 2 h under reflux. After cooling, the MOH was removed in vacuo, 200 ml of water were added and the mixture was extracted three times with 150 ml each of DCM. Subsequently, the mixture was acidified to pH=1 with concentrated hydrochloric acid and extracted four times with 200 ml each of EA. The combined organic phases were dried over sodium sulfate and the solvent was removed in vacuo. 37.80 g of the title compound were obtained as a pale yellow oil. were added the reaction mixture was heated for 2 h under reflux After cooling the MOH was removed in vacuo, 200 ml of water were added the mixture was extracted three times with 150 ml each of DCM extracted four times with 200 ml each of EA The combined organic phases were dried over sodium sulfate the solvent was removed in vacuo

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

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

Procedure: 325 grams of 2-bromo-5-fluoroaniline were dissolved in 300 milliliters of concentrated hydrochloride acid (d = 1.2 grams/ml) and 350 milliliters of water. The mixture was heated to 60° Centigrade and cooled again to 0° Centigrade, whereupon 130 grams of sodium nitrite dissolved in 330 milliliters of water were added dropwise while the temperature was kept below 4° Centigrade. The reaction mixture was then left standing for 30 minutes while stirring and keeping the temperature at 0° centigrade. Then the mixture containing the diazonium compound formed was added at 60° Centigrade to a solution of 330 grams of potassium ethylxanthate in 400 milliliters of water. CAUTION ! At temperature below 60° Centigrade there may be risk of violent explosions due to accumulation of a diazoxanthate. After the addition has been completed the mixture was stirred for 30 minutes at 60° Centigrade, cooled and extracted with ether. The ether phase was separated and washed successively with 2N sodium hydroxide solution and water and evaporated. The residue was dissolved in 1 liter of 96% ethanol, and 400 grams of potassium hydroxide were added cautiously under reflux, whereupon the reaction mixture was refluxed for 18 hours. Water was added and the ethanol evaporated. 600 milliliters of concentrated hydrochloric acid and 50 grams of zink were added and the mixture steam distilled. The distillate was extracted with ether, the ether phase separated, washed with water, dried over anhydrous magnesium sulphate and evaporated. The residue was distilled at 35 mm Hg, whereby 160 grams of 2-bromo-5-fluorothiophenol boiling at 112°-116° Centigrade was obtained. The mixture was heated to 60° Centigrade cooled again to 0° Centigrade were added dropwise while the temperature was kept below 4° The reaction mixture was then left at 0° formed At temperature below 60° Centigrade there After the addition was stirred for 30 minutes at 60° Centigrade cooled extracted with ether The ether phase was separated washed successively with 2N sodium hydroxide solution and water evaporated The residue was dissolved in 1 liter of 96% ethanol 400 grams of potassium hydroxide were added cautiously under reflux, whereupon the reaction mixture was refluxed for 18 hours Water was added the ethanol evaporated 600 milliliters of concentrated hydrochloric acid and 50 grams of zink were added the mixture steam distilled The distillate was extracted with ether the ether phase separated washed with water dried over anhydrous magnesium sulphate evaporated The residue was distilled at 35 mm Hg

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

Procedure: 76.61 g of 2-bromo-5-fluorothiophenol were dissolved in 740 ml of DMF and 62.23 g of potassium carbonate were added. A solution of 26.07 ml of iodomethane in 130 ml of DMF was then added dropwise at a temperature between 3° C. and 11° C. The reaction mixture was stirred for 3 h at room temperature, then diluted with 3 l of water and extracted four times with 500 ml each of MTB. The combined extracts were dried over sodium sulfate and the solvent was removed in vacuo. 72.71 g of the title compound were obtained as a pale brown oil. extracted four times with 500 ml each of MTB The combined extracts were dried over sodium sulfate the solvent was removed in vacuo

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

Procedure: 51.30 g of S-(2-bromo-5-fluorophenyl) dimethylthiocarbamate were dissolved in 700 ml of MOH, 494 ml of a 1 N aqueous sodium hydroxide solution were added and the reaction mixture was heated for 2 h under reflux. After cooling, the MOH was removed in vacuo, 200 ml of water were added and the mixture was extracted three times with 150 ml each of DCM. Subsequently, the mixture was acidified to pH=1 with concentrated hydrochloric acid and extracted four times with 200 ml each of EA. The combined organic phases were dried over sodium sulfate and the solvent was removed in vacuo. 37.80 g of the title compound were obtained as a pale yellow oil. were added the reaction mixture was heated for 2 h under reflux After cooling the MOH was removed in vacuo, 200 ml of water were added the mixture was extracted three times with 150 ml each of DCM extracted four times with 200 ml each of EA The combined organic phases were dried over sodium sulfate the solvent was removed in vacuo