Processes for the preparation of fluorinated acyl fluorides and fluorinated vinyl ethers

A process for preparing a fluorinated acyl fluoride represented by the following formula (3), which comprises reacting a compound represented by the following formula (1) having a fluorine content of 30 mass % or above with fluorine in a liquid phase to form a compound represented by the following formula (2) and then dissociating the ester bond in the compound represented by the formula (2):

• wherein each of RA and RB, which may be the same or different, is a monovalent saturated hydrocarbon group, a halogenated monovalent saturated hydrocarbon group, a hetero atom-containing monovalent saturated hydrocarbon group or a halogenated (hetero atom-containing monovalent saturated hydrocarbon) group, each of RC and RD, which may be the same or different, is a hydrogen atom, a halogen atom, a monovalent saturated hydrocarbon group, a halogenated monovalent saturated hydrocarbon group, a hetero atom-containing monovalent saturated hydrocarbon group or a halogenated (hetero atom-containing monovalent saturated hydrocarbon) group,
• each of X1, X2, X3, X4, X5 and X6, which may be the same or different, is a hydrogen atom or a fluorine atom, provided that at least one of RA, RB, RC, RD, X1, X2, X3, X4, X5 and X6 is a fluorine-containing group or a fluorine atom,
• RAF corresponds to RA, RBF corresponds to RB, RCF corresponds to RC, RDF corresponds to RD, and when RA, RB, RC and RD are hydrogen-containing groups, RAF, RBF, RCF and RDF are groups derived respectively from RA, RB, RC and RD by replacing substantially all the hydrogen atoms by fluorine atoms, and when RA, RB, RC and RD are groups containing no hydrogen atoms, RAF, RBF, RCF and RDF are the same as RA, RB, RC and RD, respectively,
• the combination of RA and RB and the combination of RC and RD may form bivalent groups selected from bivalent saturated hydrocarbon groups, halogenated bivalent saturated hydrocarbon groups, hetero atom-containing bivalent saturated hydrocarbon groups and halogenated (hetero atom-containing bivalent saturated hydrocarbon) groups, respectively, the combination of RAF and RBF forms a bivalent group corresponding to a bivalent group formed by the combination of RA and RB, and the combination of RCF and RDF forms a bivalent group corresponding to a bivalent group formed by the combination of RC and RD, provided that when the combination of RA and RB and the combination of RC and RD form hydrogen-containing bivalent groups, the bivalent groups formed by the combination of RAF and RBF and the combination of RCF and RDF are groups derived from the hydrogen-containing bivalent groups by replacing substantially all the hydrogen atoms by fluorine atoms, and when the combination of RA and RB and the combination of RC and RD form bivalent groups containing no hydrogen atoms, the bivalent groups formed by the combination of RAF and RBF and the combination of RCF and RDF are the same as the bivalent groups containing no hydrogen atoms.