METHOD FOR PREPARING POLYFLUORINATED ALKYL CHLOROSULFITES Russian patent published in 2005 - IPC

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing polyfluorinated alkyl chlorosulfites of the formula: H(CF₂)_nCH₂OS(O)Cl wherein n = 2, 4, 6. Method involves interaction of corresponding polyfluorinated alcohols and thionyl chloride in their mole ratio = 1:(1.5-2), respectively. Polyfluorinated alcohol is added to reaction in mixture with N,N-dimethylformamide as a catalyst in their ratio = 1:(0.001-0.01), respectively, at temperature (-15^o)-(-5^o) C. The reaction mixture is kept at temperature 20-30^oC for 0.5-3 h with blowing evolving hydrogen chloride with inert gas. Invention provides simplifying process for preparing polyfluorinated alkyl sulfites, to enhance the yield and to obtain product with enhanced stability against decomposition.

EFFECT: improved preparing method.

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