Process for producing hexafluorobiphenyl -3,3',4,4'-Tetracarboxylic acid precursors
AssigneeUbe Industries, Ltd.
InventorsYumiki Noda, Takashi Honma
Life of this patent
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Abstract
A 2,2',5,5',6,6'-hexafluorobiphenyl-3,3',4,4'-tetracarboxylic acid precursor as an intermediate material for a highly functional fluororesin may be produced at a high yield by reacting tetrafluorophthalonitrile with an alkali metal iodide.
Claims6
A process for producing a 2,2',5,5',6,6'-hexaflurobiphenyl-3,3',4,4'-tetracarboxylic acid precursor represented by the following general formula (3) ##STR4## wherein X represents CN or COOR and R represents an alkyl group of 1-5 carbon atoms, which comprises reacting a tetrafluorobenzene-o-dicarboxylic acid precursor represented by the following general formula (1) ##STR5## wherein X represents CN or COOR and R represents an alkyl group of 1-5 carbon atoms with potassium iodide in dimethylformamide.
Dependencies are inferred from the claim text.