1,2-Dibromohexafluoropropane

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: In a manner similar to Step A of Example 1, the reaction of 16.3 g (0.10 mole) 2,6-dichlorophenol, 13.8 g (0.10 mole) potassium carbonate, 1.0 g (0.013 mole) propanethiol, 62.0 g (0.20 mole) 1,2-dibromohexafluoropropane, and 125 ml of N,N-dimethylformamide produced 33.0 g of 2-(2-bromo-1,1,2,3,3,3-hexafluoropropanoxy)-1,3-dichlorobenzene as an oil. The ir spectra was consistent with the proposed structure.

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

Procedure: In a manner similar to Step A of Example 1, the reaction of 16.3 g (0.10 mole) 2,6-dichlorophenol, 13.8 g (0.10 mole) potassium carbonate, 1.0 g (0.013 mole) propanethiol, 62.0 g (0.20 mole) 1,2-dibromohexafluoropropane, and 125 ml of N,N-dimethylformamide produced 33.0 g of 2-(2-bromo-1,1,2,3,3,3-hexafluoropropanoxy)-1,3-dichlorobenzene as an oil. The ir spectra was consistent with the proposed structure.

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

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

Procedure: First 195.86 g (1.12 mol) of sodium dithionite and then 50 g (0.45 mol) of 2-fluoroaniline were added at room temperature to a mixture of 450 ml of water, 225 ml of tert-butyl methyl ether, 94.50 (1.12 mol) of sodium hydrogencarbonate and 18.33 g of tetra-n-butylammonium hydrogensulphate. Subsequently, a solution of 348.54 g of 1,2-dibromo-1,1,2,3,3,3-hexafluoropropane in 200 ml of tert-butyl methyl ether was added dropwise at 35–40° C. and, on completion of addition, the mixture was stirred at RT overnight. Sodium carbonate was used to adjust to a pH of 5 and the organic phase was removed, dried and concentrated. the organic phase was removed dried concentrated

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

Procedure: First 476.74 g (2.74 mol) of sodium dithionite and then 250 g (2.68 mol) of aniline were added at room temperature to a mixture of 4000 ml of water, 1200 ml of tert-butyl methyl ether, 270.61 g (3.22 mol) of sodium hydrogencarbonate and 10.94 g of tetra-n-butylammonium hydrogensulphate. Subsequently, a solution of 998.07 g of 1,2-dibromo-1,1,2,3,3,3-hexafluoropropane in 300 ml of tert-butyl methyl ether was added dropwise at 35–40° C. and, on completion of addition, the mixture was stirred at RT for a further 18 h. If necessary, sodium carbonate was used to adjust to a pH of 5 and the organic phase was removed, dried and concentrated. The remaining residue is incipiently distilled under reduced pressure at 0.3 mbar up to an internal temperature of 100° C. the organic phase was removed dried concentrated The remaining residue is incipiently distilled under reduced pressure at 0.3 mbar up to an internal temperature of 100° C.

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: First 154.36 g (0.887 mol) of sodium dithionite and then 50 g (0.467 mol) of o-toluidine (2-methylaniline) were added at room temperature to a mixture of 900 ml of water, 350 ml of tert-butyl methyl ether, 74.48 g (0.887 mol) of sodium hydrogencarbonate and 12.68 g of tetra-n-butylammonium hydrogensulphate. Subsequently, a solution of 274.684 g of 1,2-dibromo-1,1,2,3,3,3-hexafluoropropane in 100 ml of tert-butyl methyl ether was added dropwise at 35–40° C. and, on completion of addition, the mixture was stirred at 40° C. for a further 18 h. If necessary, sodium carbonate was used to adjust to a pH of 5 and the organic phase was removed, dried and concentrated. The remaining residue is incipiently distilled under reduced pressure at 0.3 mbar up to an internal temperature of 100° C. the organic phase was removed dried concentrated The remaining residue is incipiently distilled under reduced pressure at 0.3 mbar up to an internal temperature of 100° C.

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

Procedure: 2-(Difluoromethoxy)aniline (1280 mg) and 1,2-dibromo-1,1,2,3,3,3-hexafluoropropane (8610 mg) were dissolved in tert-butylmethyl ether (30 ml) and water (30 ml), and added with tetrabutylammonium hydrogen sulfate salt (270 mg), sodium hydrogen carbonate (2030 mg) and sodium dithionite (4200 mg) in order. The mixture was stirred vigorously at room temperature for 2 days. The reaction solution was extracted twice with ethyl acetate. The organic phases were combined and washed with water, and dried over anhydrous magnesium sulfate. The drying agent was filtered off and the solvent was removed by distillation under the reduced pressure. The resulting residues were purified by column chromatography to obtain 1-(1-bromo-1,1,2,3,3,3-hexafluoropropan-2-yl)-6-(difluoromethoxy)aniline (810 mg, 26%). The reaction solution was extracted twice with ethyl acetate washed with water dried over anhydrous magnesium sulfate The drying agent was filtered off the solvent was removed by distillation under the reduced pressure The resulting residues were purified by column chromatography

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

Procedure: In a manner similar to Step A of Example 1, the reaction of 16.3 g (0.10 mole) 2,6-dichlorophenol, 13.8 g (0.10 mole) potassium carbonate, 1.0 g (0.013 mole) propanethiol, 62.0 g (0.20 mole) 1,2-dibromohexafluoropropane, and 125 ml of N,N-dimethylformamide produced 33.0 g of 2-(2-bromo-1,1,2,3,3,3-hexafluoropropanoxy)-1,3-dichlorobenzene as an oil. The ir spectra was consistent with the proposed structure.