Processes for producing tetrafluorophthalic anhydride and fluoro

Details Processes for producing tetrafluorophthalic anhydride and fluoro Processes for producing tetrafluorophthalic anhydride and fluoro

1995-02-21

1996-06-04

Tsang, Cecilia

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

Organic compounds

Carboxylic acids and salts thereof

549246, 560 53, 560 54, 560 83, 562451, 562456, 562474, 562480, 562483, 562493, C07C 5138, C07C 6500, C07C 6976, C07D49302

Patent

active

055234763

ABSTRACT:
A process for producing tetrafluorophthalic anhydride, which comprises chlorinating tetrachlorophthalic anhydride to obtain 3,3,4,5,6,7-hexachloro-1-[3H]-isobenzofuranone, then fluorinating it to obtain 3,4,5,6-tetrafluorophthaloyldifluoride and/or 3,3,4,5,6,7-hexafluoro-1-[3H]-isobenzofuranone, and further reacting the tetrafluorophthalolyldifluoride and/or the hexafluoro-1-[3H]-isobenzofuranone with an inorganic base or an organic acid to obtain tetrafluorophthalic anhydride.

REFERENCES:
patent: 2439237 (1948-04-01), Cass
patent: 4782180 (1988-11-01), Wemple et al.
patent: 4831190 (1989-05-01), Ataka et al.
patent: 4885386 (1989-12-01), Wemple et al.
patent: 5047553 (1991-09-01), Nowak et al.
patent: 5233082 (1993-08-01), Fertel et al.
patent: 5380926 (1995-01-01), Fertel et al.
Patent Abstracts of Japan, vol. 13, No. 124 (C-580) (3472), Mar. 27, 1989, JP-A-63 295 529, Dec. 1, 1988.

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