PREPARATION OF 1,4-BIS-(DIFLUOROMETHYL)BENZENE

摘要

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.