METHOD OF OBTAINING FLUROHALOGENETHERS Russian patent published in 2008 - IPC C07C43/12 C07C41/06 C07C41/01 

FIELD: chemistry.

SUBSTANCE: invention pertains to the method of obtaining (per)fluorohalogenethers with general formula (I): (R)_nC(F)_mOCAF-CA'F₂ (I), which are used in obtaining fluorinated vinyl ethers, which are a class of essential monomers for obtaining various polymers. In formula (I) A and A' are the same or different, represent Cl or Br or one of A and A' represents hydrogen, and the other a halogen, chosen from CI, Br; R=F or fluorinated, preferably perfluorinated, substitute, chosen from the following groups: linear or branched C₁-C₂₀alkyl; C₃-C₇ cycloalkyl; C₆-C₁₀aromatic group, C₆-C₁₀arylC₁C₂₀alkyl, C₁-C₂₀alkylC₆-C₁₀aryl, or C₆-C₂₀alkyl C₅-C₁₀hetertocycle; if R represents fluorinated or perfluorinated alkyl, cycloalkyl, arylalkyl, alkylaryl, then it can optionally contains in a chain, one or more oxygen atoms; if R represents a fluorinated substitute, it can optionally contain one or more H atoms and/or one or more halogen atoms, except F; n is an integer, equal to 1 or 2; m is an integer, equal to 3-n. The method involves reaction of carbonyl compounds with formula (II): (R)_pC(F)_q(O) (II), where p is an integer, equal to 1 or 2; q is an integer, equal to 0 or 1, under the condition that, if p=2, then q=0; if p=1, then q=1; in the liquid phase with elementary fluorine and olefinic compounds with formula (III): CAF=CA'F (III).

EFFECT: invention allows obtaining fluorohalogenethers with improved selectivity.

8 cl, 9 ex