Preparation of 1,1,1,3,3,3-hexafluoro-2,2-Di(3,4-dicarboxyphenyl

Details Preparation of 1,1,1,3,3,3-hexafluoro-2,2-Di(3,4-dicarboxyphenyl Preparation of 1,1,1,3,3,3-hexafluoro-2,2-Di(3,4-dicarboxyphenyl

1991-11-26

1993-03-16

Tsang, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30777

Patent

active

051946335

ABSTRACT:
A process for preparing 1,1,1,3,3,3-hexafluoro-2,2-di(3,4-dicarboxyphenyl) propane anhydride is disclosed. 1,1,1,3,3,3-hexafluoro-2,2-di(3,4 -dimethylphenyl) propane is oxidized under liquid phase conditions in the presence of an oxygen-containing gas, bromine and heavy metal catalyst components to 1,1,1,3,3,3-hexafluoro-2,2-di(3,4-dicarboxyphenyl) propane in high yield. Addition of an anhydride of a low molecular weight carboxylic acid to the oxidation reaction mixture converts the 1,1,1-hexafluoro-2,2-di(3,4-dicarboxyphenyl)propane to 1,1,1,3,3,3-hexafluoro-2,2-di(3,4-dicarboxyphenyl) propane anhydride.

REFERENCES:
patent: 4863640 (1989-09-01), Scola
patent: 4885116 (1989-12-01), Alston et al.
patent: 4987238 (1991-01-01), Rohischeid
patent: 5004797 (1991-04-01), Rohrscheid et al.

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