CYCLIC HYDROFLUOROETHER COMPOUNDS AND PROCESSES FOR THEIR PREPARATION AND USE
申请人:Vitcak Daniel R.
公开号:US20070267464A1
公开(公告)日:2007-11-22
A hydrofluoroether compound comprises at least one five- or six-membered, perfluorinated heterocyclic ring, each ring comprising four or five ring carbon atoms and one or two catenated heteroatoms selected from divalent ether oxygen atoms and trivalent nitrogen atoms, at least one of the catenated heteroatoms being a divalent ether oxygen atom, and each of the ring carbon atoms adjacent to the divalent ether oxygen atom bearing a fluorochemical group that comprises a tetrafluoroethylidene moiety (—(CF
3
)CF—) that is directly bonded to the ring carbon atom, the fluorochemical group optionally comprising at least one catenated heteroatom selected from divalent ether oxygen atoms and trivalent nitrogen atoms.
Process for producing monoester from dicarboxylic acid fluoride
申请人:Nippon Mektron, Limited
公开号:US06407282B1
公开(公告)日:2002-06-18
Monoester monoacid fluoride of dicarboxylic acid is produced by allowing dicaroxylic acid fluoride represented by the following general formula:
FOCCF(CF3)OCF2(A)p(CF2)qCOF
where A is a bifunctional perfluorinated group having 1 to 10 carbon atoms; p is 0 or 1; and q is 0 or an integer of 1-10, to react with an alcohol having at least 3 carbon atoms, thereby esterifying the terminal CF2COF group. Such selective monoesterification reaction is effective for separation and purification of a dicarboxylic acid difluoride isomer mixture comprising symmetrical dicarboxylic acid difluoride and asymmetrical dicarboxylic acid difluoride.
new synthetic procedure for the preparation of perfluorinated carboxylic acid membrane monomers from non-fluorinated compounds has been developed. A key step in the synthetic route is liquid-phase direct fluorination reaction with elemental fluorine. Direct fluorination of a partially fluorinated diester, which was prepared from a hydrocarbon diol and a perfluorinated acyl fluoride, followed by thermal
To provide a process for producing a desired perfluorinated product at a high yield in a fluorination reaction of a partially fluorinated ester.
A perfluorinated compound (4) is obtained by fluorinating in a liquid phase a compound (3) (wherein the fluorine content is at least 30 mass %) obtained by reacting a compound (1) and a compound (2), wherein the compound (1) is HOCH
2
—R
A
—CH
2
OH, the compound (2) is X
1
C(═O)—C(R
B
)(R
C
)(R
D
), R
A
is a bivalent saturated hydrocarbon group or the like which has no hetero atom such as an etheric oxygen atom, X
1
is a halogen atom, and —C(R
B
)(R
C
)(R
D
) is a branched group.