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CAS No. : | 50739-76-9 | MDL No. : | MFCD06202693 |
Formula : | C7H7Br2NO | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | GHUMSGGCKVMYGH-UHFFFAOYSA-N |
M.W : | 280.95 | Pubchem ID : | 21320495 |
Synonyms : |
|
Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
95% | With potassium borohydride; ethanol; at 20 - 40℃; for 0.5h;Industrial scale; | 10.0 kg of absolute ethanol and 5.88 kg of methyl 3,5-dibromo-2-aminobenzoate were added to a 100 L double-layer glass reactor.After stirring uniformly, 2.62 kg of potassium borohydride was added, and stirring was continued for 30 minutes at room temperature.The temperature of the reaction mixture was raised to 40 C, and 13.5 g of an anhydrous ethanol solution containing 2.7 kg of calcium chloride was slowly added to the reaction liquid for a period of not less than 6 hours.After the addition, the reaction was stirred for 8 hours, and the UPLC test was taken. After the reaction was passed (the methyl 3,5-dibromo-2-aminobenzoate was not more than 1.0%), and cooled to room temperature.The temperature of the reaction solution was maintained at not more than 35 C, and 32 kg of 5% hydrochloric acid was slowly added to the reaction solution to adjust the pH to 2 to 3, and stirring was continued for 20 minutes, and the pH was measured again.Centrifugally filter, rinse the filter cake with purified water to neutrality, and transfer the obtained solid to the reaction kettle.20 kg of a 0.4% sodium hydroxide solution was added, and the mixture was heated to 45 C and stirred for 15 minutes, and then cooled to room temperature.Centrifugal filtration, rinse the filter cake with purified water to neutrality. It is placed in a blast drying oven tray, dried at 60 C for 20 hours, and after receiving water, it is charged with 5.08 kg, and the yield is 95%. |
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