Back to results
US 2003/0125582 A1Published application
Alkyl esters of the 2-(2-fluorosulphonyl)-perfluoroethylenoxy-3-halogen-propionic acid
AssigneeAusimont S.p.A.
InventorsVito Tortelli, Sara MacUlan
Life of this patent
Estimating the term…
Abstract
Compounds of formula CH2Y—CH(COOR1)—O—CF2CF2—SO2F, usable in the synthesis of the fluorosulphonic vinylether —CF2═CF—O——CF2CF2—SO2F.
Claims6
Compounds of the following formula (II):
- CH2Y—CH(COOR1)—O—CF2CF2—SO4F (II)
- wherein:
- Y=Cl, Br;
- R1=C1-C4 linear or branched alkyl.
1 more element
2 Compounds according to claim 1, wherein in formula (II) Y=C1 and R1=methyl.
A process to prepare the fluorosulphonic vinylether CF2═CF—O—CF2CF2—SO2F comprising the following steps:
- 1) fluorination of the formula (II) compound to give the acylfluoride CF2YCF(COF)OCF2CF2—SO2F;
- 2) saponification of the acylfluoride to the corresponding carboxylate CF2YCF(COO−Me+)OCF2CF2—SO2F, wherein Me+ is the alkaline metal cation;
- 3) thermal decomposition of the carboxylate obtained in 2) and formation of the fluorosulphonic vinylether.
Dependencies are inferred from the claim text.