[EN] ADDITION REACTION TO FLUOROALLYLFLUOROSULFATE<br/>[FR] RÉACTION D'ADDITION À DU FLUOROALLYLFLUOROSULFATE
申请人:SOLVAY SOLEXIS SPA
公开号:WO2009083451A1
公开(公告)日:2009-07-09
The invention pertains to a process for preparing compounds of formula (I-A) or (I-B) here below: by reaction of perfluoroallylfluorosulfate (FAFS) of formula (II): with at least one hypofluorite of formula (II-A) or (II-B): wherein: RF in formulae (I-A) and (II-A) is a monovalent fluorocarbon C1-C20 group, optionally comprising oxygen catenary atoms, optionally comprising functional groups comprising heteroatoms (e.g. -SO2F groups); R'F in formulae (I-B) and (II-B) is a divalent fluorocarbon C-1-C6 group, preferably a group of formula (III): wherein X1 and X2, equal to or different from each other, are independently a fluorine atom or a C1-C3 fluorocarbon group. The FAFS-hypofluohte adducts of formulae (I-A) and (I-B) can be produced with high selectivity so as to access useful intermediates which can further be reacted taking advantage of the un-modified fluorosulfate group chemistry.
A process for preparing (per)fluorohalogenethers containing the —SO
2
F group, having general formula (I):
FSO
2
—R—CF
2
OCAF—CA′F
2
(I)
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):
FSO
2
—R—COF (II)
wherein R is as above;
in liquid phase with elemental fluorine and with olefinic compounds having formula (III):
CAF═CA′F (III)
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.