METHOD FOR PREPARING POLYFLUORINATED ALCOHOLS Russian patent published in 2003 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to preparing polyfluorinated alcohols of the general formula: R_fX where R₁ means H(CF₂CF₂)_n where n = 1-8; X means . Method is carried out by telomerization of tetrafluoroethylene with aliphatic alcohols at elevated temperature and pressure in the presence of water and peroxide inorganic initiating agent. Hydrogen peroxide or aqueous solutions of persulfates Me₂S₂O₈ (Me-K, Na, NH₄).) are used as an initiating agent. Process is carried at temperature 50-95 C under pressure 8-18 kg/kg/cm² in the mole ratio initiating agent : tetrafluoroethylene = 1 : (69.1-278.4) and aliphatic alcohol : water = 1 : (0.015-0.08), respectively. Purification of polyfluorinated alcohols is carried out with 1.0-50% solution of potassium hydroxide. Method provides reduced formation of by-side products and induced decomposition of catalyst. EFFECT: improved preparing method. 4 cl, 2 tbl