申请人:AIR PRODUCTS AND CHEMICALS, INC.
公开号:EP0970938A1
公开(公告)日:2000-01-12
Sulfur tetrafluoride is used at subambient temperatures and near ambient pressures to deoxofluorinate 1,4-terephthalaldehyde in a solvent of hydrogen fluoride and produce 1,4-bis-(difluoromethyl) benzene in very high yield and purity. This product is 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.
四氟化硫可在亚环境温度和近环境压力下,在氟化氢溶剂中使 1,4-对苯二甲醛脱氧氟化,生成产量和纯度都非常高的 1,4-双(二氟甲基)苯。这种产品是被称为 "AF4 "的八氟-[2,2]对二环烷的前体,可以聚合成具有优异介电性能的有用薄膜。HF 可以用中性有机溶剂稀释。