METHOD OF SYNTHESIS OF HEXAFLUOROBENZENE AND ITS MONO- AND DISUBSTITUTED DERIVATIVES Russian patent published in 1999 - IPC

FIELD: chemical technology. SUBSTANCE: invention relates to synthesis of hexafluorobenzene and its mono- and disubstituted derivatives of the general formula C₆F₄XY where X - F, Cl, H, CF₃,CCl₃, CN, COR; Y - F, CN, H, Cl, CF₃,CCl₃, COR. Synthesis is carried out from the corresponding chloro-containing compounds by heating parent substances with alkaline metal fluorides in the presence of tetraamidophosphonium quaternary salt and a promoter. Heterocyclic or heterochain organic compounds, ethers or esters, organic acid nitriles, quaternary ammonium salts or their mixtures are used as a promoter. The weight ratio salt : promoter = from 100:1 to 2:1 but preferably = (5-20):1. The mole ratio of alkaline metal fluoride to catalyst is from 1000:1 to 10:1. EFFECT: increased yield of the end product, simplified process. 4 cl, 12 ex