2,4-Dibromothiophene
2,4-Dibromothiophene
CAS: 3140-92-9
Molecular Formula: C4H2Br2S
2,4-Dibromothiophene - Names and Identifiers
| Name | 2,4-Dibromothiophene |
| Synonyms | S0514 2,4-DIBROMOTHIOPHENE 2,4-Dibromothiophene Thiophene, 2,4-dibromo- |
| CAS | 3140-92-9 |
| EINECS | 678-717-9 |
| InChI | InChI=1/C4H2Br2S/c5-3-1-4(6)7-2-3/h1-2H |
2,4-Dibromothiophene - Physico-chemical Properties
| Molecular Formula | C4H2Br2S |
| Molar Mass | 241.93 |
| Density | 2.157 g/mL at 25 °C |
| Melting Point | -26.3°C |
| Boling Point | 215°C |
| Flash Point | 215°C |
| Water Solubility | It is insoluble in water. |
| Vapor Presure | 0.24mmHg at 25°C |
| Appearance | liquid |
| Specific Gravity | 2.149 |
| BRN | 107651 |
| Storage Condition | Keep in dark place,Inert atmosphere,2-8°C |
| Refractive Index | 1.631-1.633 |
| MDL | MFCD00043889 |
| Use | This product is for scientific research only and shall not be used for other purposes. |
2,4-Dibromothiophene - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R41 - Risk of serious damage to eyes R37/38 - Irritating to respiratory system and skin. R25 - Toxic if swallowed |
| Safety Description | S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S39 - Wear eye / face protection. |
| UN IDs | UN2810 |
| WGK Germany | 3 |
| HS Code | 29349990 |
| Hazard Note | Irritant |
| Hazard Class | 6.1 |
| Packing Group | III |
2,4-Dibromothiophene - Reference Information
| Uses | 2,4-dibromothiophene is an organic intermediate that can be prepared from thiophene through a two-step reaction. It has been reported in the literature that it can be used to prepare ERR inverse agonists. |
| preparation | 2,3, 5-tribromothiophene (1):120g (1.43 mol) of thiophene is added with 240 ml of glacial acetic acid, 687g (4.30 mol) of Br2 is added dropwise at 5-10 ℃, stirring at room temperature for 3 hours and refluxing heating for 2 hours. Subsequently, glacial acetic acid was evaporated under vacuum and the residue was distilled through a short Vigreux column under water jet vacuum. Yield: 376.2g(1.17mol)1(82%). 2,4-dibromothiophene (4): 120g(0.374mol)2,3, 5-tribromothiophene (1) is dissolved in 300mL of diethyl ether, cooled to -30 ℃ under N2, and at this temperature, 234mL6NBuLi n-hexane solution (0.374mol) is added dropwise within 10 minutes, stirred at -30 ℃ for 5 minutes, 1L of cold water is poured, and extracted with diethyl ether 3 times. The combined ether phase was washed 3 times with water, dried with Na2SO4 and evaporated. The residue was fractionated on a 1m Vigreux flask under vacuum. Yield: 60g(0.248mol)4(66%). |
Last Update：2024-04-09 02:00:03
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