3,4-dimethyl bromobenzene
4-Bromo-o-xylene
CAS: 583-71-1
Molecular Formula: C8H9Br
3,4-dimethyl bromobenzene - Names and Identifiers
| Name | 4-Bromo-o-xylene |
| Synonyms | 4-Bromo-o-xylene 4-bromo-ortho-xylene 3,4-Dimethylbromobenzene 3,4-dimethyl bromobenzene Dexmedetomidine Impurity 50 4-bromo-1,2-dimethylbenzene 4-Bromo-o-xylene, (3,4-Dimethylbromobenzene). 4-Bromo-1,2-dimethylbenzene~3,4-Dimethylbromobenzene |
| CAS | 583-71-1 |
| EINECS | 209-518-3 |
| InChI | InChI=1/C8H9Br/c1-6-3-4-8(9)5-7(6)2/h3-5H,1-2H3 |
3,4-dimethyl bromobenzene - Physico-chemical Properties
| Molecular Formula | C8H9Br |
| Molar Mass | 185.061 |
| Density | 1.370 |
| Boling Point | 214-215° |
| Flash Point | 85.8°C |
| Water Solubility | Not miscible in water. |
| Vapor Presure | 0.234mmHg at 25°C |
| Appearance | clear liquid |
| Color | Colorless to Light yellow |
| Refractive Index | 1.543 |
| Physical and Chemical Properties | Relative density: 1.37 Boiling Point: 215 ℃ refractive index: 1.555-1.557 flash point: 80 ℃ |
3,4-dimethyl bromobenzene - Risk and Safety
| Hazard Symbols | Xi - Irritant N - Dangerous for the environment  |
| Risk Codes | R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S24/25 - Avoid contact with skin and eyes. S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 1701 |
3,4-dimethyl bromobenzene - Nature
Open Data Verified Data
colorless liquid. Boiling point 214.5 °c. Melting Point -0.2 °c. The relative density was 1. 3708. Refractive index 5530. Flash point 80 °c. Insoluble in water, soluble in alcohol, ether.
Last Update：2024-01-02 23:10:35
3,4-dimethyl bromobenzene - Preparation Method
Open Data Verified Data
bromination of O-xylene, O-xylene, iodine and iron powder were added to the reactor, and bromine was added dropwise under cooling of ice brine to control the rate of bromine addition, the reaction solution was maintained at not more than 5 ° C., and the evolved hydrogen bromide was absorbed with a sodium hydroxide solution. After the bromine was added dropwise, it was left overnight at room temperature, washed with 5% dilute sodium hydroxide solution in a separatory funnel until the red color fades, then washed with water, and the oil layer was subjected to steam distillation to obtain 3,4-methyl bromobenzene. The yield was 75%.
Last Update：2022-01-01 10:41:31
3,4-dimethyl bromobenzene - Use
Open Data Verified Data
as an intermediate of a meltable polyimide resin.
Last Update：2022-01-01 10:41:30
3,4-dimethyl bromobenzene - Safety
Open Data Verified Data
- This product is toxic, by high heat release toxic gases, to prevent direct contact and inhalation of steam. See bromobenzene.
- This product can be burned when exposed to open fire, should be stored in a cool and ventilated warehouse, away from the fire, heat source, should be stored separately from edible chemical raw materials, oxidants, light when handling, light discharge, keep the packaging intact to prevent leakage. Fog water; Foam extinguishing agent; C02 extinguishing agent shall be used for fire extinguishing.
Last Update：2022-01-01 10:41:32
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