Patent ID: 8399703

Claim:
A method of producing a fluorine-containing compound comprising the steps of: (1) adding, to a compound (a1), a compound (a2) in an aqueous medium under an alkaline condition to obtain a compound (a3), the compound (a1) represented by CF 2 ═CF—Rf 2 —X, wherein Rf 2 represents a fluoroalkylene group containing 1 to 3 carbon atoms, X represents —COOM or —SO 3 M, and M represents one of H, K, Na, or NH 4 , the compound (a2) represented by Rf 1 —CH 2 OH, wherein Rf 1 represents a fluoroalkyl group containing 1 to 5 carbon atoms and the compound (a3) represented by Rf 1 —CH 2 —O—CF 2 —CHF—Rf 2 —X, wherein Rf 1 , Rf 2 , and X are as defined above; and (2) fluorinating the compound (a3) to obtain the fluorine-containing compound, the fluorine-containing compound represented by Rf 3 —O—CF 2 —Rf 4 —X, wherein Rf 3 represents a fluoroalkyl group containing 1 to 6 carbon atoms, Rf 4 represents a fluoroalkylene group containing 1 to 4 carbon atoms, and X is as defined above.