Patent ID: 6548719
Filing Date: 2003-04-15
Classification: C07C

Abstract:
Process for the preparation of fluorine-containing olefins of the formula CF3CY&boxH;CXnHp wherein Y is a hydrogen atom or a halogen atom selected from the group consisting of fluorine, chlorine, bromine or iodine; X is a hydrogen atom or a halogen atom selected from the group consisting of fluorine, chlorine, bromine or iodine; n and p are integers independently equal to 0, 1 or 2, provided that (n+p)=2 comprising contacting, in the presence of a phase transfer catalyst:(A) a compound of the formula CF3C(R1aR2b)C(R3cR4d), wherein R1, R2, R3, and R4 are independently a hydrogen atom or a halogen selected from the group consisting of fluorine; chlorine, bromine and iodine, provided that at least one of R1, R2, R3, and R4 is halogen and there is at least one hydrogen and one halogen on adjacent carbon atoms; a and b are independently=0, 1 or 2 and (a+b)=2; and c and d are independently=0, 1, 2 or 3 and (c+d)=3; (B) at least one alkali metal hydroxide; (C) wherein said process is conducted at from about âˆ’5Â° C. to about 40Â° C.; and (D) wherein said process is conducted without added solvent or diluent.