Method of producing perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane)
AssigneesSagami Chemical Research Institute, Tosoh Corporation, Tosoh Finechem Corporation
InventorsMunenori Inoue, Tatsuya Ueji, Hiroshi Matsuo
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Abstract
Provided is a method of producing perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane, the method having a dimer reaction step of reacting a trifluoropyruvic acid fluoride dimer with hexafluoropropylene oxide in an organic solvent in the presence of one or more fluorides selected from the group consisting of potassium fluoride and sodium fluoride to obtain perfluoro(dimethyl-2-oxo-1,4-dioxane).
Claims9
A method of producing perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane), the method comprising:
- reacting a trifluoropyruvic acid fluoride dimer with hexafluoropropylene oxide in an organic solvent in the presence of at least one fluoride selected from the group consisting of potassium fluoride and sodium fluoride,
- wherein an amount of the at least one fluoride added in the reacting is from 0.08 to 0.3 times of a molar amount the trifluoropyruvic acid fluoride dimer,
- separating the perfluoro(dimethyl-2-oxo-1,4-dioxane) obtained in the reacting from a reaction liquid, and then
- conducting isomerization of perfluoro(dimethyl-2-oxo-1,4-dioxane) into perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane) in the presence of an organic solvent and the at least one fluoride further added in the isomerization,
- wherein an amount of the at least fluoride further added in the isomerization is from 0.5 to 1.5 times of a molar amount of the perfluoro(dimethyl-2-oxo-1,4-dioxane), or
- wherein an amount of the at least one fluoride further added in the isomerization is from 0.5 to 1.8 times of a molar amount of the trifluoropyruvic acid fluoride dimer,
- wherein
- at least one additive selected from the group consisting of cesium fluoride and tetramethylammonium fluoride is added in the isomerization, and
- an amount of the at least one additive in the isomerization is from 0.05 to 0.2 times of a molar amount of the trifluoropyruvic acid fluoride dimer, or
- an amount of the at least one additive in the isomerization is from 0.03 to 0.15 times of a molar amount of perfluoro(dimethyl-2-oxo-1,4-dioxane).
A method of producing perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane), the method comprising:
- reacting a trifluoropyruvic acid fluoride dimer with hexafluoropropylene oxide in an organic solvent in the presence of at least one fluoride selected from the group consisting of potassium fluoride and sodium fluoride, and
- conducting isomerization of perfluoro(dimethyl-2-oxo-1,4-dioxane) into perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane),
- wherein 18-crown-6 or 15-crown-5 is added as an additive in an amount of from 0.05 to 1.5 times of a molar amount of the trifluoropyruvic acid fluoride dimer in the isomerization.
A method of producing perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane), the method comprising:
- reacting a trifluoropyruvic acid fluoride dimer with hexafluoropropylene oxide in an organic solvent in the presence of at least one fluoride selected from the group consisting of potassium fluoride and sodium fluoride, and
- conducting isomerization of perfluoro(dimethyl-2-oxo-1,4-dioxane) into perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane),
- wherein 18-crown-6 or 15-crown-5 is added as an additive in the isomerization in an amount of from 0.05 to 1.0 times of a molar amount of perfluoro(dimethyl-2-oxo-1,4-dioxane).
Dependencies are inferred from the claim text.