Process for preparing (per)fluorohaloethers

Abstract

A kind of is used for preparing -SO with general formula (I) 2 Method for (per)fluorinated haloether of F group: FSO 2 -R-CF 2 OCAF-CA'F 2 (I) in which: -A and A', the same or different from each other, are Cl or Br; -R has the following meaning: (per)fluorinated, preferably perfluorinated, optionally with one or more oxygen The substituting group of atom; The method is by the carbonyl compound FSO of formula (II) 2 -R-COF (II) wherein R is as defined above; in the liquid phase reacts with elemental fluorine and an alkene compound of formula (III): CAF=CA'F (III) wherein A and A' are as defined above, the reaction is at -120 °C to -20 °C, optionally in the presence of solvent inert components under the reaction conditions. The description of this industrial invention is carried out in the name of SOLVAY SOLEXIS S.p.A. of Italy, whose head office is at Milano, Via Turati, 12.

Description

technical field

[0001] The present invention relates to a method for preparing 2 F) Process for fluorinating vinyl ethers.

[0002] More specifically, the present invention relates to the preparation of 2 A process for F-based fluorinated haloethers by dehalogenation to the corresponding fluorinated vinyl ethers, which increases selectivity and reduces the formation of non-recyclable by-products.

[0003] This fluorosulfonic acid vinyl ether can form a class for obtaining -SO 2 Monomer of F-group polymers used in electrochemical applications as membranes in chlorine-based soda cells, fuel cells or as acid catalysts in organic synthesis. Background technique

[0004] obtained in the prior art with -SO 2 Methods for the fluorinated haloethers of F groups are known.

[0005] USP 4,358,412 describes fluorosulfonic acid vinyl ether CF 2 = CF-O-CF 2 CF 2 SO 2 Synthesis of F, in which the first step is via the acyl fluoride FOC-CF 2 -SO 2 The reaction of F with perfluoro...

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