Preparation of 1,4-bis-(difluoromethyl)benzene

Details Preparation of 1,4-bis-(difluoromethyl)benzene Preparation of 1,4-bis-(difluoromethyl)benzene

C - Chemistry, Metallurgy

07

C

C07C 22/08 (2006.01) C07C 17/18 (2006.01) C07C 25/13 (2006.01) C07C 201/12 (2006.01) C07C 205/11 (2006.01)

Patent

CA 2276930

Sulfur tetrafluoride is used at subambient temperatures and near ambient pressures to deoxofluorinate 1,4-terephthalaldehyde in a solvent of hydrogen fluoride end produce 1,4-bis-(difluoromethyl) benzene in very high yield and purity. This product a precursor of octafluoro-[2,2]paracyclophane, known as "AF4", that can be polymerized into useful films having excellent dielectric properties. The HF can be diluted with neutral organic solvents.

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