反应详情

Into a 200 ml-volume flask equipped with a thermometer, a stirring unit, a nitrogen inlet and a reflux condenser, 10.4 g (50.0 mmol) of 2,3,5,6-tetrafluoroxylylenediamine synthesized in Example 1, 50 g of water and 10.35 g (150.0 mmol) of sodium nitrite were charged, and the mixture was stirred at room temperature for 30 minutes. Subsequently, under cooling of the reactor in a water bath, 6.13 g (62.5 mmol) of sulfuric acid was added dropwise over 60 minutes while keeping the inside of the reaction system at 40° C. or less. The reaction solution obtained was extracted with 10.0 g of methyl ethyl ketone, the organic phase was washed with 5.0 g of an aqueous 5 mass % sulfuric acid solution, and then the methyl ethyl ketone was removed by distillation, as a result, 7.9 g of 2,3,5,6-tetrafluorobenzenedimethanol was obtained as white crystals. The purity determined from the GC area in percentage was 98.3% and the yield was 73.9%.

1. customInto a 200 ml-volume flask equipped with a thermometer
2. temperatureSubsequently, under cooling of the reactor in a water bath
3. customat 40° C. or less
4. customThe reaction solution obtained
5. extractionwas extracted with 10.0 g of methyl ethyl ketone
6. washthe organic phase was washed with 5.0 g of an aqueous 5 mass % sulfuric acid solution
7. customthe methyl ethyl ketone was removed by distillation, as a result