Process for producing fluorinated ketone

A process for producing a fluorinated ketone of the following formula (5), which comprises reacting a compound of the following formula (3) having a fluorine content of at least 30 mass %, with fluorine in a liquid phase to obtain a compound of the following formula (4), and then, subjecting the ester linkage of the compound of the formula (4) to a dissociation reaction:

• RCCOOCHRARB (3)RCFCOOCFRAFRBF (4)RAFRBFC═O (5)
• wherein each of RA and RAF which may be the same or different, is a monovalent organic group, provided that when RA and RAF are different, RAF is a monovalent organic group formed by fluorination of RA, and each of RB and RBF which may be the same or different, is a monovalent organic group, provided that when RB and RBF are different, RBF is a monovalent organic group formed by fluorination of RB, and at least one of RAF and RBF is a fluorinated monovalent organic group;
• or
• RA and RB may be bonded to each other to form a bivalent organic group, and in such a case, RAF and RBF are bonded to each other to form a bivalent organic group, the bivalent organic group formed by RAF and RBF is a fluorinated bivalent organic group, the bivalent organic group formed by RA and RB and the bivalent organic group formed by RAF and RBF may be the same or different, provided that when they are different, the bivalent organic group formed by RAF and RBF is a group formed by fluorination;
• and
• each of RC and RCF which may be the same or different, is a monovalent organic group, provided that when RC and RCF are different, RCF is a monovalent organic group formed by fluorination of RC, and provided that at least one of RA, RB and RC is a group having an atom or an atomic group which can be substituted by a fluorine atom, and at least one of RA, RB and RC is a group having a fluorine atom.