(2-bromo-4-fluorophenyl) methyl carbonate

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

Procedure: Then, 110 g (0.44 mol) of methyl 2-bromo-4-fluorophenoxyformate was dissolved in 250 ml of sulfuric acid, to which a mixed acid of 30 g of fuming nitric acid and 30 ml of sulfuric acid was added dropwise at 5° C. or lower, and the mixture was stirred for 2 hours. The reaction mixture was poured onto ice, and the precipitated crystals were collected by filtration, washed with water, and dried, which afforded 126 g (0.43 mol) of methyl 2-bromo-4-fluoro-5-nitrophenoxyformate. was added dropwise at 5° C. The reaction mixture was poured onto ice the precipitated crystals were collected by filtration washed with water dried

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

Procedure: First, 93 g (0.49 mol) of 2-bromo-4-fluorophenol was suspended in 200 ml of water, into which 55 g (0.59 mol) of methyl chloroformate and a solution of 21.5 g (0.51 mol) of sodium hydroxide in 60 ml of water were poured together at 10° C. or lower, and the mixture was stirred at the same temperature for 2 hours. The precipitated crystals were collected by filtration, washed with water, and dried in a vacuum oven, which afforded 111.6 g (0.45 mol) of methyl 2-bromo-4-fluorophenoxyformate. The precipitated crystals were collected by filtration washed with water dried in a vacuum oven, which

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

Procedure: First, 93 g (0.49 mol) of 2-bromo-4-fluorophenol was suspended in 200 ml of water, into which 55 g (0.59 mol) of methyl chloroformate and a solution of 21.5 g (0.51 mol) of sodium hydroxide in 60 ml of water were poured together at 10° C. or lower, and the mixture was stirred at the same temperature for 2 hours. The precipitated crystals were collected by filtration, washed with water, and dried in a vacuum oven, which afforded 111.6 g (0.45 mol) of methyl 2-bromo-4-fluorophenoxyformate. The precipitated crystals were collected by filtration washed with water dried in a vacuum oven, which

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

Procedure: Then, 110 g (0.44 mol) of methyl 2-bromo-4-fluorophenoxyformate was dissolved in 250 ml of sulfuric acid, to which a mixed acid of 30 g of fuming nitric acid and 30 ml of sulfuric acid was added dropwise at 5° C. or lower, and the mixture was stirred for 2 hours. The reaction mixture was poured onto ice, and the precipitated crystals were collected by filtration, washed with water, and dried, which afforded 126 g (0.43 mol) of methyl 2-bromo-4-fluoro-5-nitrophenoxyformate. was added dropwise at 5° C. The reaction mixture was poured onto ice the precipitated crystals were collected by filtration washed with water dried

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

Procedure: First, 93 g (0.49 mol) of 2-bromo-4-fluorophenol was suspended in 200 ml of water, into which 55 g (0.59 mol) of methyl chloroformate and a solution of 21.5 g (0.51 mol) of sodium hydroxide in 60 ml of water were poured together at IONIC or lower, and the mixture was stirred at the same temperature for 2 hours. The precipitated crystals were collected by filtration, washed with water, and dried in a vacuum oven, which afforded 111.6 g (0.45 mol) of methyl 2-bromo-4-fluorophenoxyformate. The precipitated crystals were collected by filtration washed with water dried in a vacuum oven, which

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

Procedure: A rapidly stirred solution of 946 g (3.8 moles) of 2-bromo-4-fluorophenyl methyl carbonate in 1292 mL of sulfuric acid was cooled to 5°-10° C., and 368 g (4.18 moles) of 70% nitric acid was added dropwise over two hours. Upon complete addition, the reaction mixture was allowed to warm to ambient temperature and was stirred for two hours. The reaction mixture was poured into 5000 mL of ice water. Any material remaining in the reaction vessel was washed into the ice-water with 750 mL of water. The resultant solid was collected by filtration and washed with 1000 mL of water. The solid was dried with mild heat under reduced pressure to give 1031 g of 2-bromo-4-fluoro-5nitrophenyl methyl carbonate. Upon complete addition was washed into the ice-water with 750 mL of water The resultant solid was collected by filtration washed with 1000 mL of water The solid was dried with mild heat under reduced pressure

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

Procedure: A stirred solution of 561 g (5.0 moles) of 4-fluorophenol in 600 mL of dioxane was cooled in an ice-water bath and 831 g (5.2 moles) of bromine was added dropwise. The complete addition required 1.5 hours, during which the reaction mixture temperature was maintained at 14°-25° C. Following the addition, the ice-water bath was removed, and the reaction mixture temperature rose to 35° C. The reaction mixture was stirred for two hours, then 600 mL of water, followed by 420 mL of 10.8N aqueous sodium hydroxide were added dropwise over 30 minutes and 1 hour respectively. Upon complete addition, the reaction mixture was cooled to 0°-10° C., and 591 g (6.15 moles) of methyl chloroformate was added dropwise over four hours. Upon complete addition, the reaction mixture was allowed to warm to ambient temperature and was stirred for 17 hours. After this time, 450 g of aqueous 50% sodium hydroxide was added to neutralize the reaction mixture. The resultant solid was collected by filtration, and the filter cake washed with two 500 mL portions of water. The solid was dried under reduced pressure to give 1211 g of 2-bromo-4-fluorophenyl methyl carbonate; m.p. 75°-78° C. The complete addition required 1.5 hours during which the reaction mixture temperature was maintained at 14°-25° C the addition the ice-water bath was removed rose to 35° C were added dropwise over 30 minutes and 1 hour respectively Upon complete addition the reaction mixture was cooled to 0°-10° C. Upon complete addition was stirred for 17 hours The resultant solid was collected by filtration the filter cake washed with two 500 mL portions of water The solid was dried under reduced pressure

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

Procedure: A stirred solution of 561 g (5.0 moles) of 4-fluorophenol in 600 mL of dioxane was cooled in an ice-water bath and 831 g (5.2 moles) of bromine was added dropwise. The complete addition required 1.5 hours, during which the reaction mixture temperature was maintained at 14°-25° C. Following the addition, the ice-water bath was removed, and the reaction mixture temperature rose to 35° C. The reaction mixture was stirred for two hours, then 600 mL of water, followed by 420 mL of 10.8N aqueous sodium hydroxide were added dropwise over 30 minutes and 1 hour respectively. Upon complete addition, the reaction mixture was cooled to 0°-10° C., and 591 g (6.15 moles) of methyl chloroformate was added dropwise over four hours. Upon complete addition, the reaction mixture was allowed to warm to ambient temperature and was stirred for 17 hours. After this time, 450 g of aqueous 50% sodium hydroxide was added to neutralize the reaction mixture. The resultant solid was collected by filtration, and the filter cake washed with two 500 mL portions of water. The solid was dried under reduced pressure to give 1211 g of 2-bromo-4-fluorophenyl methyl carbonate; m.p. 75°-78° C. The complete addition required 1.5 hours during which the reaction mixture temperature was maintained at 14°-25° C the addition the ice-water bath was removed rose to 35° C were added dropwise over 30 minutes and 1 hour respectively Upon complete addition the reaction mixture was cooled to 0°-10° C. Upon complete addition was stirred for 17 hours The resultant solid was collected by filtration the filter cake washed with two 500 mL portions of water The solid was dried under reduced pressure

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

Procedure: Then, 110 g (0.44 mol) of methyl 2-bromo-4-fluorophenoxyformate was dissolved in 250 ml of sulfuric acid, to which a mixed acid of 30 g of fuming nitric acid and 30 ml of sulfuric acid was added dropwise at 5° C. or lower, and the mixture was stirred for 2 hours. The reaction mixture was poured onto ice, and the precipitated crystals were collected by filtration, washed with water, and dried, which afforded 126 g (0.43 mol) of methyl 2-bromo-4-fluoro-5-nitrophenoxyformate. was added dropwise at 5° C. The reaction mixture was poured onto ice the precipitated crystals were collected by filtration washed with water dried