2-FLUORO-5-CHLOROBROMOBENZENE
2-Bromo-4-chloro-1-fluorobenzene
CAS: 1996-30-1
Molecular Formula: C6H3BrClF
2-FLUORO-5-CHLOROBROMOBENZENE - Names and Identifiers
2-FLUORO-5-CHLOROBROMOBENZENE - Physico-chemical Properties
| Molecular Formula | C6H3BrClF |
| Molar Mass | 209.44 |
| Density | 1.719 |
| Boling Point | 180 °C |
| Flash Point | 180°C |
| Vapor Presure | 0.622mmHg at 25°C |
| Storage Condition | Sealed in dry,Room Temperature |
| Refractive Index | 1.554 |
2-FLUORO-5-CHLOROBROMOBENZENE - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S24/25 - Avoid contact with skin and eyes. |
| WGK Germany | 3 |
| HS Code | 29039990 |
| Hazard Note | Irritant |
2-FLUORO-5-CHLOROBROMOBENZENE - Reference Information
| application | 3-bromo-4-fluorochlorobenzene can be used as an organic synthesis intermediate and a pharmaceutical intermediate, mainly used in laboratory research and development processes and chemical production processes. 3-bromo-1-chloro-4-fluorobenzene is an organic intermediate, which can be prepared from p-fluoronitrobenzene through a three-step reaction. It has been reported that it can be used to prepare 5-chloro-2-methoxybenzonitrile, which is mainly used in medicine, pesticide and other industries. |
| preparation | (1) bromination reaction: add 7.095g p-fluoronitrobenzene and 12 g acetic acid to the reaction container, and control the temperature in water bath to 15 ℃. Under stirring, slowly add 8.9g N-bromosuccinimide. During the addition process, the temperature should not exceed 15 ℃. After adding, the heat preservation reaction was 10 h, and the reaction was over. After the reaction, pour the reactants into 500 mL ice water, precipitate solids, filter, and dry to obtain 10.23g of light yellow powdered solid 3-brom-4-fluoronitrobenzene with a 93% yield. (2) nitro reduction reaction: add 11.0g of 3-brom-4-fluoronitrobenzene to the reaction vessel, add water to 1/2 of the reaction vessel, add 2.5g of ammonium chloride, raise the temperature to 70 ℃, add 7.0g of iron powder in batches, do not exceed 70 ℃ during the adding process, keep the temperature for 10 h after adding, and the reaction ends. After the reaction is over, 40 mL ethyl acetate is added to the reaction container for extraction, filtration, liquid separation, and vacuum distillation to obtain reddish brown liquid 3-brom-4-fluoroaniline 7.6g, with a 80% yield. (3) diazotization-Sandmeier reaction: add 9.5g of 3-bromine -4-fluoroaniline, 10.5 mL of hydrochloric acid, control the temperature to -5 ℃, slowly drop the sodium nitrite aqueous solution prepared from 3.795g of sodium nitrite and 13 mL of water under stirring, control the temperature to -5 ℃ during the dropping process, keep the temperature and stir for 2 h after dropping, heat the temperature to 35 ℃, add 1.24g cuprous chloride, keep the temperature and stir for 1 h, and the reaction ends. After the reaction, pour the product into 200 mL of water, add 40 mL 1,2-dichloroethane for extraction, after repeated washing with water, separate the liquid and distill under reduced pressure to obtain 8.2g of yellow liquid 3-bromo-1-chloro-4-fluorobenzene with a 78.3% yield. |
Last Update：2024-04-09 02:00:02
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