Patent ID: 7358405

Claim:
A process for obtaining vinyl compounds of formula T-Ar—(O) y —CF═CF 2 by dehalogenation of halofluorinated compounds having formula: T-Ar—(O) y —CFX′—CF 2 X″ (I) wherein: X′=F, Cl, Br, I; X″=Cl, Br, I; y is an integer 0, 1; when y=0 X′≠F; T=H, —(O) y —CFX′—CF 2 X″, wherein y, X′ and X″ are as above; Ar is a monocyclic, bicyclic or tricyclic bivalent aromatic radical from 5 to 14 carbon atoms, optionally the ring containing one or more heteroatoms, or Ar is formed of two aromatic rings linked by a bivalent radical selected from the following: said aromatic radical Ar being substituted with at least one substituent selected from the following: Cl F, Br, OH; C 1 -C 8 alkyl; —COOH, or a —C(O)R acyl group, wherein R is H, or C 1 -C 8 alkyl, C 5 -C 14 aryl, C 3 -C 6 cycloalkyl; said process characterized in that the halofluorinated compounds are dehalogenated in the presence of a transition metal, by operating in a biphasic system of solvents immiscible among each other, formed of a (per)fluorinated solvent and a dipolar aprotic or protic solvent (co-solvent), wherein the moles ratio of co-solvent/equivalent of the halofluorinated compound with aromatic substituents ranges from 0.5 to 10.