Patent ID: 7622616

Claim:
A process for obtaining perfluorovinyl compounds by dehalogenation of halofluorinated compounds having a linear, branched or cyclic structure, containing in the molecule at least one group: wherein Y 1 and Y 2 , equal to or different from each other, are selected from Cl, Br, or I; wherein the halofluorinated compounds are dehalogenated to remove chlorine, but not fluorine in the presence of a transition metal or a transition metal couple, by operating in a biphasic system of solvents immiscible among each other, formed of inert (per)fluorinated solvent and an aprotic dipolar or protic solvent (co-solvent), wherein the ratio moles of co-solvent/equivalents of the halofluorinated compound ranges from 0.5 to 10; wherein the halofluorinated compounds are selected from the following classes: A) T 1 —(O) z″ —R f —[(OCFY 1 ) z —(CFY 1 ) z′ —CF 2 Y 2 ] wherein: Y 1 and Y 2 have the above meanings; z=0 or 1; z′=0 or 1, z being different from z′; z″=0 or 1; R f has the following meanings: linear or branched C 1 -C 20 fluoroalkylene, optionally containing one or more oxygen atoms; (per)fluoropolyoxyalkylene containing one or more of the following units statistically distributed along the chain: (C 3 F 6 O); (CFX 1 O) wherein X 1 is F or CF 3 ; (C 2 F 4 O); (CF 2 (CF 2 ) x′ CF 2 O) wherein x′ is an integer equal to 1 or 2; (CR 4 R 5 CF 2 CF 2 O) wherein R 4 and R 5 are equal to or different from each other and are selected from H or Cl, and one fluorine atom of the perfluoromethylene unit is optionally substituted with H, Cl or (per)fluoroalkyl having from 1 to 4 carbon atoms; when R f is (per)fluoroalkylene, z″=0 when za as defined below is 1; when R f is (per)fluoropolyoxyalkylene z=0, z″=1 when za=0; T 1 is F or is a substituent having the following formula: CF 2 Y 2 —(CFY 1 ) z′ —(CFY 1 O) za — wherein za is an integer equal to 0 or 1; Y 1 , Y 2 , z′ are as above; B) dioxolanes of formula: wherein: Y 1 and Y 2 are as above; P is F, R b wherein R b is C 1 -C 3 perfluoroalkyl, or OR b ; Y 3 and Y 4 , equal or different, are F or CF 3 .