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CAS No. : | 118994-90-4 | MDL No. : | MFCD04114931 |
Formula : | C4H3NO3 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | QCGMEWVZBGQOFN-UHFFFAOYSA-N |
M.W : | 113.07 | Pubchem ID : | 16340557 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H315-H319-H335 | 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 |
---|---|---|
87.5% | With lithium hydroxide monohydrate; water; at 25℃; for 6.5h;Large scale; | An aqueous solution of lithium hydroxide monohydrate (124.5 kg of a solution preparedfrom 49.44 kg lithium hydroxide monohydrate dissolved in 319 kg water, 398 mol) was added to asolution of <strong>[118994-89-1]ethyl 5-oxazolecarboxylate</strong> (54 kg, 382.7 mol) in water (54 kg) maintaining the temperature below 25 C. The reaction was stirred for 6.5 h and then conc. aqueous HCI (64.8 kg) was added maintaining the temperature below 25 C, the crystallisation cooled to 5 C and held forh. The product was filtered off, washed with cold water (88 kg), then isopropanol (171 kg) anddried under vacuum at 50 C to give the title compound (37.88 kg, 87.S%).1H NMR (400 MHz, DMSO-d6) ppm 13.68 (br. 5., 1 H), 8.59 (5, 1 H), and 7.88 (5, 1 H). |
87.5% | With lithium hydroxide monohydrate; In water; at 25℃; for 6.5h;Large scale; | An aqueous solution of lithium hydroxide monohydrate (124.5 kg of a solution prepared from 49.44 kg lithium hydroxide monohydrate dissolved in 319 kg water, 398 mol) was added to a solution of <strong>[118994-89-1]ethyl 5-oxazolecarboxylate</strong> (54 kg, 382.7 mol) in water (54 kg) maintaining the temperature below 25 C. The reaction was stirred for 6.5 h and then cone, aqueous HCI (64.8 kg) was added maintaining the temperature below 25 C, the crystallisation cooled to 5 C and held for 1 h. The product was filtered off, washed with cold water (88 kg), then isopropanol (171 kg) and dried under vacuum at 50 C to give the title compound (37.88 kg, 87.5%). (0437) *H NMR (400 MHz, DMSO-cfe) delta ppm 13.68 (br. s., 1 H), 8.59 (s, 1 H), and 7.88 (s, 1 H). |
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