374063-92-0
2-Bromo-5-hydroxypyrazine
CAS: 374063-92-0
Molecular Formula: C4H3BrN2O
374063-92-0 - Names and Identifiers
374063-92-0 - Physico-chemical Properties
| Molecular Formula | C4H3BrN2O |
| Molar Mass | 174.98 |
| Density | 2.00±0.1 g/cm3(Predicted) |
| Melting Point | 115-119°C |
| Boling Point | 444.001°C at 760 mmHg |
| Flash Point | 222.324°C |
| Vapor Presure | 0mmHg at 25°C |
| Appearance | White powder |
| Color | White to light brown |
| pKa | 10.02±0.40(Predicted) |
| Storage Condition | Keep in dark place,Sealed in dry,Room Temperature |
| Sensitive | Sensitive to light |
| Refractive Index | 1.625 |
| MDL | MFCD06245330 |
374063-92-0 - Risk and Safety
| Risk Codes | R22 - Harmful if swallowed R41 - Risk of serious damage to eyes |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S39 - Wear eye / face protection. |
| WGK Germany | 1 |
| HS Code | 29339900 |
374063-92-0 - Reference Information
| Use | 2-hydroxy-5-bromopyrazine is an organic intermediate, it has been reported that it can be used to prepare a graphite electrode based on CeO-ZrO-NiO and pyrazine modification. |
| preparation | in an ice-water bath, add sodium nitrite (2G, 11.49mmol) to 8ml of concentrated sulfuric acid, after the addition, the temperature was raised to 45 ° C., stirred for 30min, and completely dissolved. 12ml of concentrated sulfuric acid was poured into an Erlenmeyer flask, and 2-amino-5-bromopyrazine (2G, 11.36mmol) was added in small portions to the Erlenmeyer flask and stirred well until completely dissolved. In an ice-water bath, slowly Dropwise add 2-amino-5-bromopyrazine dissolved in concentrated sulfuric acid into a round-bottom flask containing sodium nitrite, and after the dropwise addition, heat to 45 ° C, reaction 1 hour. The reaction solution was poured into ice water, and the PH was adjusted to about 3 with solid sodium hydroxide. Ethyl acetate was added, the ethyl acetate layer was separated, dried over anhydrous sodium sulfate, and the organic solvent was distilled off under reduced pressure to obtain 1.25g of 2-hydroxy-5-bromopyrazine as a pale yellow solid in a yield of 62.9%. |
Last Update：2024-04-09 19:05:05
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View History
374063-92-0
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