1,1,2-trifluoro-2-(trifluoromethoxy)ethene

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

Procedure: Trifluoromethyl trifluorovinyl ether was blown into a mixture of 1.0 g of ethyl 1-(3-chloro-2-pyridinyl)-3-hydroxy-1H-pyrazole-5-carboxylate, 0.042 g of potassium hydroxide, 10 ml of methanol and 10 ml of dimethyl sulfoxide under ice-cooling. The resulting mixture was stirred at room temperature for 4 days. Water was poured into the reaction mixture, and the mixture was extracted with diethyl ether two times. The organic layers were combined, washed with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 1.32 g of methyl 1-(3-chloro-2-pyridinyl)-3-[1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy]-1H-pyrazole-5-carboxylate of the formula: cooling the mixture was extracted with diethyl ether two times washed with water an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate concentrated under reduced pressure

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

Procedure: Trifluoromethyl trifluorovinyl ether was blown into a mixture of 1.0 g of ethyl 1-(3-chloro-2-pyridinyl)-3-hydroxy-1H-pyrazole-5-carboxylate, 0.042 g of potassium hydroxide, 10 ml of methanol and 10 ml of dimethyl sulfoxide under ice-cooling. The resulting mixture was stirred at room temperature for 4 days. Water was poured into the reaction mixture, and the mixture was extracted with diethyl ether two times. The organic layers were combined, washed with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 1.32 g of methyl 1-(3-chloro-2-pyridinyl)-3-[1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy]-1H-pyrazole-5-carboxylate of the formula: cooling the mixture was extracted with diethyl ether two times washed with water an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate concentrated under reduced pressure

Conditions: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Hexafluorobutanol, CF3CFHCF2CH2OH (65.3 g, 0.34 mol), prepared essentially as described in Example 2) was combined with potassium carbonate (9.9 g, 0.072 mol) and 133 g of acetonitrile in a 600 mL Parr reactor. The temperature of the reactor was raised to 45° C. and CF3OCF═CF2 (65.6 g, 0.39 mol) added as a gas over about two hours. The resulting reaction mixture was stirred for about 18 hours at 45° C. The reactor was cooled and the contents of the reactor filtered to remove the potassium carbonate. The resulting product-containing filtrate was distilled using a concentric tube column, with the product cut boiling at 115-119° C. The product structure was confirmed by GCMS. The resulting reaction mixture The reactor was cooled the contents of the reactor filtered to remove the potassium carbonate The resulting product-containing filtrate was distilled

Conditions: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Hexafluorobutanol, CF3CFHCF2CH2OH (65.3 g, 0.34 mol), prepared essentially as described in Example 2) was combined with potassium carbonate (9.9 g, 0.072 mol) and 133 g of acetonitrile in a 600 mL Parr reactor. The temperature of the reactor was raised to 45° C. and CF3OCF═CF2 (65.6 g, 0.39 mol) added as a gas over about two hours. The resulting reaction mixture was stirred for about 18 hours at 45° C. The reactor was cooled and the contents of the reactor filtered to remove the potassium carbonate. The resulting product-containing filtrate was distilled using a concentric tube column, with the product cut boiling at 115-119° C. The product structure was confirmed by GCMS. The resulting reaction mixture The reactor was cooled the contents of the reactor filtered to remove the potassium carbonate The resulting product-containing filtrate was distilled

Conditions: temp:-35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 1-gallon Hastelloy C276 reaction vessel is charged with a solution of 114 g potassium sulfite hydrate (KHSO3.H2O, 95%, Aldrich, 0.72 mol), 440 g potassium metabisulfite (K2S2O5, 99%, Mallinckrodt, 1.98 mol) and 2000 mL of deionized water. The pH of this solution is 5.8. The vessel is cooled to −35° C., evacuated to −3 psig (81 kPa), and purged with nitrogen. This evacuate/purge cycle is repeated two more times. 600 g perfluoro(methyl vinyl ether) (PMVE, 3.61 mol) is added to the vessel, which is heated to 125° C. at which time the internal pressure is 462 psig (3290 kPa). The reaction temperature is maintained at 125° C. for 6 hr. The pressure drops to 25 psig (275 kPa) at which point the vessel is vented and cooled to 25° C. Once cooled, a white crystalline precipitate of the forms, leaving clear colorless liquid above it (pH=7). 19F NMR of the white solid shows it to be the desired product in high purity (>98%). 19F NMR of the liquid shows a small but detectable amount of the hydration product of Equation (3), above. evacuated to −3 psig (81 kPa) purged with nitrogen is heated to 125° C. at which time the internal pressure The reaction temperature is maintained at 125° C. for 6 hr cooled to 25° C Once cooled a white crystalline precipitate of the forms, leaving clear colorless liquid above it (pH=7)

Conditions: temp:-35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 1-gallon Hastelloy C276 reaction vessel is charged with a solution of 114 g potassium sulfite hydrate (KHSO3.H2O, 95%, Aldrich, 0.72 mol), 440 g potassium metabisulfite (K2S2O5, 99%, Mallinckrodt, 1.98 mol) and 2000 mL of deionized water. The pH of this solution is 5.8. The vessel is cooled to −35° C., evacuated to −3 psig (81 kPa), and purged with nitrogen. This evacuate/purge cycle is repeated two more times. 600 g perfluoro(methyl vinyl ether) (PMVE, 3.61 mol) is added to the vessel, which is heated to 125° C. at which time the internal pressure is 462 psig (3290 kPa). The reaction temperature is maintained at 125° C. for 6 hr. The pressure drops to 25 psig (275 kPa) at which point the vessel is vented and cooled to 25° C. Once cooled, a white crystalline precipitate of the forms, leaving clear colorless liquid above it (pH=7). 19F NMR of the white solid shows it to be the desired product in high purity (>98%). 19F NMR of the liquid shows a small but detectable amount of the hydration product of Equation (3), above. evacuated to −3 psig (81 kPa) purged with nitrogen is heated to 125° C. at which time the internal pressure The reaction temperature is maintained at 125° C. for 6 hr cooled to 25° C Once cooled a white crystalline precipitate of the forms, leaving clear colorless liquid above it (pH=7)

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

Procedure: Trifluoromethyl trifluorovinyl ether was blown into a mixture of 1.0 g of ethyl 1-(3-chloro-2-pyridinyl)-3-hydroxy-1H-pyrazole-5-carboxylate, 0.042 g of potassium hydroxide, 10 ml of methanol and 10 ml of dimethyl sulfoxide under ice-cooling. The resulting mixture was stirred at room temperature for 4 days. Water was poured into the reaction mixture, and the mixture was extracted with diethyl ether two times. The organic layers were combined, washed with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 1.32 g of methyl 1-(3-chloro-2-pyridinyl)-3-[1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy]-1H-pyrazole-5-carboxylate of the formula: cooling the mixture was extracted with diethyl ether two times washed with water an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate concentrated under reduced pressure

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

Procedure: Trifluoromethyl trifluorovinyl ether was blown into a mixture of 1.0 g of ethyl 1-(3-chloro-2-pyridinyl)-3-hydroxy-1H-pyrazole-5-carboxylate, 0.042 g of potassium hydroxide, 10 ml of methanol and 10 ml of dimethyl sulfoxide under ice-cooling. The resulting mixture was stirred at room temperature for 4 days. Water was poured into the reaction mixture, and the mixture was extracted with diethyl ether two times. The organic layers were combined, washed with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 1.32 g of methyl 1-(3-chloro-2-pyridinyl)-3-[1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy]-1H-pyrazole-5-carboxylate of the formula: cooling the mixture was extracted with diethyl ether two times washed with water an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate concentrated under reduced pressure

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

Procedure: Trifluoromethyl trifluorovinyl ether was blown into a mixture of 1.0 g of ethyl 1-(3-chloro-2-pyridinyl)-3-hydroxy-1H-pyrazole-5-carboxylate, 0.042 g of potassium hydroxide, 10 ml of methanol and 10 ml of dimethyl sulfoxide under ice-cooling. The resulting mixture was stirred at room temperature for 4 days. Water was poured into the reaction mixture, and the mixture was extracted with diethyl ether two times. The organic layers were combined, washed with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 1.32 g of methyl 1-(3-chloro-2-pyridinyl)-3-[1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy]-1H-pyrazole-5-carboxylate of the formula: cooling the mixture was extracted with diethyl ether two times washed with water an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate concentrated under reduced pressure

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

Procedure: A VF2/PMVE/TFE copolymer fluoroelastomer was prepared by a continuous emulsion polymerization process, carried out at 105° C. in a well-stirred 2.0-liter stainless steel liquid full reaction vessel. An aqueous solution, consisting of 1.98 g/hour (g/h) ammonium persulfate initiator and 0.79 g/h sodium hydroxide, was fed to the reactor at a rate of 4 L/hour. The reactor was maintained at a liquid-full level at a pressure of 6.2 MPa by means of a backpressure control valve in the effluent line. After 30 minutes, polymerization was initiated by introduction of a gaseous monomer mixture consisting of 569 g/h vinylidene fluoride (VF2), 393 g/h perfluoro(methyl vinyl ether) (PMVE), and 101 g/h tetrafluoroethylene (TFE), fed through a diaphragm compressor. Fifteen minutes after polymerization commenced, 4-bromo-3,3,4,4-tetrafluoro-1-butene (BTFB) was fed into the reactor at a rate of 10.0 g/h. After a further 1.75 hours, collection of effluent dispersion was begun and collection continued for 5 hours. The effluent polymer latex, which had a pH of 8.88 and contained 21.3 wt. % solids, was separated from residual monomers in a degassing vessel at atmospheric pressure. carried out at 105° C. in a well-stirred 2.0-liter stainless steel liquid full reaction vessel The reactor was maintained at a liquid-full level at a pressure of 6.2 MPa by means of a backpressure control valve in the effluent line polymerization Fifteen minutes after polymerization After a further 1.75 hours collection of effluent dispersion collection continued for 5 hours was separated from residual monomers in a degassing vessel at atmospheric pressure

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

Procedure: 1.20 g of ethyl-1-{2-fluoro-4-methyl-5-(2,2,2-trifluoroethylthio)phenyl}-3-hydroxypyrazole-4-carboxylate was dissolved in 40 mL of N,N-dimethylformamide, 25 g of triethylamine was added, and stirring was carried out at 50° C. for 3 hours while trifluoromethyl trifluorovinyl ether was blown. To this solution, ethyl acetate was added, followed by washing with a saturated aqueous solution of citric acid, and then the organic layer was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The obtained residue was purified by column chromatography (developing solvent ethyl acetate:hexane=1:4) to obtain 0.73 g of ethyl-1-{2-fluoro-4-methyl-5-(2,2,2-trifluoroethylthio)phenyl}-3-{1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy}pyrazole-4-carboxylate (1H-NMR (CDCL3/TMS δ (ppm) value) δ: 1.36 (3H, t), 2.51 (3H, s), 3.41 (2H, q), 4.34 (2H, q), 6.21 (1H, dt), 7.16 (1H, d), 7.97 (1H, d), 8.38 (1H, d)). by washing with a saturated aqueous solution of citric acid the organic layer was dried over anhydrous magnesium sulfate the solvent was distilled off under reduced pressure The obtained residue was purified by column chromatography (developing solvent ethyl acetate:hexane=1:4)

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

Procedure: 1.20 g of ethyl-1-{2-fluoro-4-methyl-5-(2,2,2-trifluoroethylthio)phenyl}-3-hydroxypyrazole-4-carboxylate was dissolved in 40 mL of N,N-dimethylformamide, 25 g of triethylamine was added, and stirring was carried out at 50° C. for 3 hours while trifluoromethyl trifluorovinyl ether was blown. To this solution, ethyl acetate was added, followed by washing with a saturated aqueous solution of citric acid, and then the organic layer was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The obtained residue was purified by column chromatography (developing solvent ethyl acetate:hexane=1:4) to obtain 0.73 g of ethyl-1-{2-fluoro-4-methyl-5-(2,2,2-trifluoroethylthio)phenyl}-3-{1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy}pyrazole-4-carboxylate (1H-NMR (CDCL3/TMS δ (ppm) value) δ: 1.36 (3H, t), 2.51 (3H, s), 3.41 (2H, q), 4.34 (2H, q), 6.21 (1H, dt), 7.16 (1H, d), 7.97 (1H, d), 8.38 (1H, d)). by washing with a saturated aqueous solution of citric acid the organic layer was dried over anhydrous magnesium sulfate the solvent was distilled off under reduced pressure The obtained residue was purified by column chromatography (developing solvent ethyl acetate:hexane=1:4)