Process for preparing fluorohalogenethers

Details Process for preparing fluorohalogenethers Process for preparing fluorohalogenethers

2007-04-24

2007-04-24

Keys, Rosalynd (Department: 1621)

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

Organic compounds

Oxygen containing

C562S849000

Reexamination Certificate

active

11044022

ABSTRACT:
A process for preparing (per)fluorohalogenethers having general formula:wherein:A and A′, equal to or different from each other, are selected among Cl, Br and H; m=1, 2; n=0, 1; R′ is a C1to C3(per)fluoroalkyl substituent; R is a (per)fluoropolyether substituent; z and z′ are 1 or zero, X1=F, CF3;by reaction of carbonyl compounds having formula:in-line-formulae description="In-line Formulae" end="lead"?(R′)n—C(O)(F)q(CFX1(CF2)z(CH2)z′OR1)  (II)in-line-formulae description="In-line Formulae" end="tail"?wherein:R′ and n are as above; q=0, 1; X1=F or CF3; z=0 or 1;R1is a (per)fluoropolyether substituent;in liquid phase, with elemental fluorine and with olefinic compounds of formula:in-line-formulae description="In-line Formulae" end="lead"?CAF=CA′F2  (III)in-line-formulae description="In-line Formulae" end="tail"?wherein A and A′ are as above,at temperatures from −120° C. to −20° C., preferably from −100° C. to −40° C.

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