Process for the preparation of difluoromaleic anhydride

Details Process for the preparation of difluoromaleic anhydride Process for the preparation of difluoromaleic anhydride

1989-11-14

1992-05-12

Dentz, Bernard I.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549 62, C07D30760

Patent

active

051129930

ABSTRACT:
A process for producing difluoromaleic anhydride by reacting sulfur trioxide with a fluorinated precursor selected from the group consisting of hexafluoro-2,5-dihydrofuran, hexafluoro-2,5-dihydrothiophene, difluoro-2,5-dihydrothiophene-2,5-dione and tetrafluoro-2,5-dihydrothiophene-2-one. Also disclosed are the compounds difluoro-2,5-dihydrothiophene-2,5-dione and tetrafluoro-2,5-dihydrothiophene-2-one. Difluoromaleic anhydride is useful for example as a component of fluoropolymers.

REFERENCES:
patent: 2891968 (1959-06-01), Raasch
Kobrina, L. S. et al., Zh. Org. Khim., vol. 8, pp. 2165-2177 (1972).
Krespan, C. G. and Dixon, D. A., J. Org. Chem., vol. 51, pp. 4460-4466 (1986).

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