Process for preparing (per) fluorohalogenethers

Details Process for preparing (per) fluorohalogenethers Process for preparing (per) fluorohalogenethers

2007-01-02

2007-01-02

Keys, Rosalynd (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfur halides

C568S032000, C568S035000

Reexamination Certificate

active

10795995

ABSTRACT:
A process for preparing (per)fluorohalogenethers containing the —SO2F group, having general formula (I):in-line-formulae description="In-line Formulae" end="lead"?FSO2—R—CF2OCAF—CA′F2  (I)in-line-formulae description="In-line Formulae" end="tail"?wherein:A and A′, equal to or different from each other, are Cl or Br;R has the following meanings: a (per)fluorinated, preferably perfluorinated, substituent, optionally containing one or more oxygen atoms;by reaction of carbonyl compounds having formula (II):in-line-formulae description="In-line Formulae" end="lead"?FSO2—R—COF  (II)in-line-formulae description="In-line Formulae" end="tail"?wherein R is as above;in liquid phase with elemental fluorine and with olefinic compounds having formula (III):in-line-formulae description="In-line Formulae" end="lead"?CAF═CA′F  (III)in-line-formulae description="In-line Formulae" end="tail"?wherein A and A′ are as above,operating at temperatures from −120° C. to −20° C., optionally in the presence of a solvent inert under the reaction conditions.

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