Tetrafluoroterephthalonitrile → (2,3,5,6-Tetrafluorophenyl)methanamine

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From the toluene extract, a small amount of a sample was withdrawn, and it was subjected to GC analysis. As a result of the analysis, a peak of the tetrafluoroterephthalonitrile as a raw material was below the detection limit, and the amount of tetrafluoroterephthalaldehyde was 68.9 mol %. On the other hand, the aqueous phase was neutralized and then subjected to GC analysis. As a result of the analysis, presence of 14.8 mol % of 2,3,5,6-tetrafluorobenzylamine was confirmed. The results are set forth in Table 1.

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