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CAS No. : | 5744-56-9 | MDL No. : | MFCD00159636 |
Formula : | C6H8N2O2 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | QRWZFUBHOQWUGH-UHFFFAOYSA-N |
M.W : | 140.14 | Pubchem ID : | 587721 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P280-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302 | Packing Group: | N/A |
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 |
---|---|---|
81% | c. Synthesis of 1 ,3-dimethyl-pyrazole-5-carboxylic acid; 3,delta-dimethyl-pyrazole-delta-carboxylic acid methylester (5.14 Kg) is added to an aqueous solution of 20% sodium hydroxide (10 L) at O0C. The reaction mixture is stirred at room temperature for 18 hours and cooled to O0C. Concentrated hydrochloric acid (4.2 L) is then added to the reaction mixture in over 7 hours. The resulting thick slurry is stirred at room temperature for 18 hours. The mixture is filtered, and the solids are washed with water (500 mL), and dried in a vacuum oven for 18 hours (700C and 26 mm Hg) to provide 3.8 Kg of 1 ,3- dimethyl-pyrazole-delta-carboxylic acid (81 % yield with a purity of >97 % by HPLC). |
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