2-ethenyl-1,3-difluorobenzene

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 1000-mL round bottom flask equipped with a mechanical stirrer, thermometer and addition funnel was charged with 2-(dimethylamino)-N-hydroxy-2-oxoethanimidoyl chloride (94.0 g, 0.62 mol) and a solution of 2,6-difluorostyrene (84.0 g, 0.60 mol) in chlorobenzene (275 g). The reaction mixture was cooled to 10° C., and a solution of potassium bicarbonate (70 g, 0.70 mol) in water (350 mL) was added dropwise over 1 h while maintaining the reaction temperature between 10 to 15° C. When gas chromatography analysis of the reaction mixture showed about 3% of 2-(dimethylamino)-N-hydroxy-2-oxo-ethanimidoyl chloride remaining, water (200 mL) was added to the reaction mixture. The layers were separated, and the organic layer was washed with water (300 mL) and concentrated under reduced pressure. Toluene was added to the resulting residu, and the mixture was again concentrated under reduced pressure to provide the title compound as an oil (144 g). A 1000-mL round bottom flask equipped with a mechanical stirrer thermometer and addition funnel while maintaining the reaction temperature between 10 to 15° C was added to the reaction mixture The layers were separated the organic layer was washed with water (300 mL) concentrated under reduced pressure Toluene was added to the resulting residu the mixture was again concentrated under reduced pressure

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 1000-mL round bottom flask equipped with a mechanical stirrer, thermometer and addition funnel were added 2-(dimethylamino)-N-hydroxy-2-oxoethanimidoyl chloride (94.0 g, 0.62 mol) and a solution of 2,6-difluorostyrene (84.0 g, 0.60 mol) in chlorobenzene (275 g). The reaction mixture was cooled to 10° C., and then a solution of potassium bicarbonate (70 g, 0.70 mol) in water (350 mL) was added dropwise over 1 h while maintaining the temperature between 10 to 15° C. When gas chromatography analysis of the reaction mixture showed about 3% of 2-(dimethylamino)-N-hydroxy-2-oxo-ethanimidoyl chloride remaining, water (200 mL) was added to the reaction mixture, and the layers were separated. The organic layer was washed with water (300 mL) and concentrated under reduced pressure. Toluene was added to the resulting residue, and the mixture was concentrated under reduced pressure to provide the title compound as an oil (144g). To a 1000-mL round bottom flask equipped with a mechanical stirrer thermometer and addition funnel while maintaining the temperature between 10 to 15° C was added to the reaction mixture the layers were separated The organic layer was washed with water (300 mL) concentrated under reduced pressure Toluene was added to the resulting residue the mixture was concentrated under reduced pressure

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

Procedure: To a stirred solution of 3-chloro-N-hydroxy-2-oxopropanimidoyl chloride (0.89 g, 5.71 mmol) in acetonitrile (20 mL) was added 2-ethenyl-1,3-difluorobenzene (1.0 g, 7.14 mmol) and sodium bicarbonate (1.8 g, 2.14 mmol) at room temperature. The reaction mixture was stirred at room temperature for 12 h, concentrated in under reduced pressure and the resulting material was partitioned between ethyl acetate (50 mL) and water (50 mL). The organic layer was separated, washed with saturated aqueous sodium chloride solution and concentrated in under reduced pressure. The resulting material was triturated with petroleum ether and filtered to provide the title product as white solid (1.1 g) melting at 82.1-83.4° C. concentrated in under reduced pressure the resulting material was partitioned between ethyl acetate (50 mL) and water (50 mL) The organic layer was separated washed with saturated aqueous sodium chloride solution concentrated in under reduced pressure The resulting material was triturated with petroleum ether filtered

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a 1 L round bottom flask equipped with a mechanical stirrer, thermometer and addition funnel was added 2-(dimethylamino)-N-hydroxy-2-oxoethanimidoyl chloride (94.0 g, 0.62 mol) and 2,6-difluorostyrene (84.0 g, 0.60 mol) in chlorobenzene (275 g). The reaction mixture was cooled to 10° C., and then potassium bicarbonate (70 g, 0.70 mol) in water (350 mL) was added dropwise over 1 h while maintaining the temperature between 10 and 15° C. When gas chromatography analysis of the reaction mixture showed about 3% of 2-(dimethylamino)-N-hydroxy-2-oxo-ethanimidoyl chloride remaining, water (200 mL) was added to the reaction mixture and the layers were separated. The organic layer was washed with water (300 mL) and concentrated under reduced pressure. Toluene was added to the resulting residue and the mixture was concentrated under reduced pressure to provide the title compound as an oil (144 g). To a 1 L round bottom flask equipped with a mechanical stirrer thermometer and addition funnel while maintaining the temperature between 10 and 15° C was added to the reaction mixture the layers were separated The organic layer was washed with water (300 mL) concentrated under reduced pressure Toluene was added to the resulting residue the mixture was concentrated under reduced pressure