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1 840 588

(13)

(51)

IPC

C07C43/17(2006-01-01)

(21) (22)

Application

3074833/04, 1983-10-04

(22)

Actual filing date

1983-10-04

(45)

Published

2007-08-27

(72)

Inventor

Mukhametshin Farid MubarakshevichLekontseva Galina IvanovnaKorovushkin Galaktion GalaktionovichJakurnova Galina IvanovnaGerman Lev SolomonovichVilenchik Jakov MoiseevichLjapunov Mikhail IvanovichZhirnov Oleg MikhajlovichFirsov Aleksandr Nikolaevich

METHOD FOR PREPARING PERFLUOROPOLYOXAETHYLENE DICARBOXYLIC ACID DIFLUOROANHYDRIDES Russian patent published in 2007 - IPC C07C43/17

Abstract SU 1840588 A1

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for synthesis of perfluoropolyoxaethylene dicarboxylic acid difluoroanhydrides of the general formula: FOC(CF₂OCF₂)_nCOF wherein n = 1-10 in using tetrafluoroethylene oxide in the presence of catalyst in solvent at temperature (-15)-(-40)°C. In aim for simplifying the process tetrafluoroethylene oxide is added for interaction with fluorosulfonyloxydifluoroacetyl fluoride, and potassium fluoride or cesium fluoride is used a catalyst.

EFFECT: improved method of synthesis.

3 tbl, 2 ex

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SU 1 840 588 A1

Authors

Mukhametshin Farid Mubarakshevich

Lekontseva Galina Ivanovna

Korovushkin Galaktion Galaktionovich

Jakurnova Galina Ivanovna

German Lev Solomonovich

Vilenchik Jakov Moiseevich

Ljapunov Mikhail Ivanovich

Zhirnov Oleg Mikhajlovich

Firsov Aleksandr Nikolaevich

Dates

2007-08-27—Published

1983-10-04—Filed