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CAS No. : | 1897-52-5 | MDL No. : | MFCD00001778 |
Formula : | C7H3F2N | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | BNBRIFIJRKJGEI-UHFFFAOYSA-N |
M.W : | 139.10 | Pubchem ID : | 74695 |
Synonyms : |
|
Signal Word: | Danger | Class: | 6.1 |
Precautionary Statements: | P501-P261-P270-P271-P264-P280-P337+P313-P305+P351+P338-P361+P364-P332+P313-P301+P310+P330-P302+P352+P312-P304+P340+P311-P403+P233-P405 | UN#: | 3439 |
Hazard Statements: | H301+H311+H331-H315-H319 | Packing Group: | Ⅲ |
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 |
---|---|---|
71% | at 35℃; Inert atmosphere | 2 L four-necked flask, 600mL60percent sulfuric acid was added, with stirring was added 2,6-difluorobenzonitrile 139.0g (1.0mol), in N2Under protection, control of the reaction temperature below 35°C, points added 250.5g of KBrO3 10 portions(1.5mol), TLC monitoring, the reaction 5-6 days, until starting material disappeared point, the reaction was stopped, the ice preparation 800mL20percent saline solution, the reaction mixture was poured into iced brine.After settlement products, quickly suction filtration to give a crude orange product with CCl4The crude product was dissolved, respectively, with 5percent NaHSO3Solution, saturated Na2CO3Solution was washed with water until the solution was neutral, dried over anhydrous sodium sulfate, the solution was filtered, 60 water bath rotary evaporation to give a pale yellow liquid was cooled to a standstill for some time as a pale yellow solid, distillation under reduced pressure, condensed steam heated, oil bath was raised to 90 deg.] C, taking the temperature of 58-62°C steam fraction, and cooled to obtain a white solid product, 71percent yield. |
71% | at 35℃; Inert atmosphere | Take 2 L four bottles, add 600 mL of 60percent sulfuric acid, electric stirring by adding 2,6_ difluorobenzonitrile 139.0 g (1.0 mol). Under N2 protection, the control reaction temperature was below 35 ° C, and 250 μm g of KBr03 (1.5 mol) was added to 10 batches. TLC monitoring, reaction 5-6 days, until the raw material point disappears, stop the reaction, the preparation of 800 mL 20percent ice salt solution, the reaction solution Into the ice salt. After the product settling, the rapid filtration, the orange crude products, with CC14 dissolved crude products, respectively, with 5percent Of NaHS03 solution, saturated Na2C03 solution and water to the solution was neutral, dried over anhydrous sodium sulfate, the solution was filtered, the water bath 60 ° C steamed to obtain light yellow liquid, rest for some time to cool into a pale yellow solid, vacuum distillation, warm water condensing steam, oil The bath was heated to 90 ° C and the fraction at a steam temperature of 58-62 ° C was cooled to give a white solid product in 71percent yield |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | at 0 - 20℃; for 24 h; | A solution of 2,6- difluorobenzonitrile (5.0 g, 36 mmol) in concentrated sulfuric acid (25 mL) was treated with NBS (7.0 g, 29.5 mmol) at 0 °C and stirred at ambient temperature for 24 hours. Ice (about 100 g) was added to the reaction mixture. After melting, the mixture was extracted with MTBE (100 mL). The organic layer was separated, washed with brine, dried (sodium sulfate), filtered and concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel eluting with 5: 1 to 1 :2 hexanes/ethyl acetate to give both 3- bromo-2,6-difluorobenzonitrile (5.5 g, 70percent yield) as solid and 3-bromo-2,6- difluorobenzamide (2.1 g, 25percent) as solid. |
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