Partially fluorinated tetracarboxylic acid and the dianhydride t

Details Partially fluorinated tetracarboxylic acid and the dianhydride t Partially fluorinated tetracarboxylic acid and the dianhydride t

1991-06-20

1992-10-06

Tsang, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

562488, 562416, 528170, 528172, 528174, 528176, 528188, 528510, 528322, 5283291, 528350, 528351, 528353, C07D30777, C07C 6316

Patent

active

051533340

ABSTRACT:
Partially fluorinated tetracarboxylic acid and the dianhydride thereof, a process for their preparation and their use
A compound of the formula ##STR1## and the dianhydride thereof are prepared by air oxidation in the presence of a catalyst mixture composed of at least 2 heavy metal salts and also bromine in an acid organic medium. The compounds can be employed for the preparation of partially fluorinated polycondensates, such as polyimides, polycarboxamides, esters of polyamidecarboxylic acids, polyamides and imide-oligomers.

REFERENCES:
patent: 3355500 (1967-11-01), Farah et al.
patent: 5003031 (1991-03-01), Schwartz et al.
patent: 5004797 (1991-04-01), Rohrscheid et al.
Farah, B. S. et al, J. Org. Chem. 30:998-1001 (1965).
Colon, I. et al, J. Org. Chem. 51:2627-2636 (1986).

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