1,2-dibromobenzene
1,2-dibromobenzene
CAS: 583-53-9
Molecular Formula: C6H4Br2
1,2-dibromobenzene - Names and Identifiers
1,2-dibromobenzene - Physico-chemical Properties
| Molecular Formula | C6H4Br2 |
| Molar Mass | 235.9 |
| Density | 1.956 g/mL at 25 °C (lit.) |
| Melting Point | 4-6 °C (lit.) |
| Boling Point | 224 °C (lit.) |
| Flash Point | 91 °C |
| Water Solubility | Insoluble |
| Solubility | 0.075g/l |
| Vapor Presure | 0.129mmHg at 25°C |
| Vapor Density | 8.2 (vs air) |
| Appearance | Liquid |
| Specific Gravity | 1.956 |
| Color | brown-yellow |
| BRN | 970241 |
| Storage Condition | Store at |
| Refractive Index | n20/D 1.611(lit.) |
| Physical and Chemical Properties | Colorless or light yellow liquid. Melting point 7.1 ℃, boiling point 244 ℃(225 ℃),104 ℃(2.0kPa),92 ℃(1.33kPa), relative density 1.9843(20/4 ℃), refractive index 1.6155. Soluble in ethanol, soluble in ether, acetone, benzene and carbon tetrachloride, insoluble in water. Flash point 91 degrees Celsius. |
1,2-dibromobenzene - 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 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection |
| UN IDs | UN 2711 |
| WGK Germany | 3 |
| TSCA | T |
| HS Code | 29036990 |
| Hazard Note | Irritant |
| Hazard Class | 9 |
| Packing Group | III |
1,2-dibromobenzene - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | 1, 2-dibromobenzene is also called o-dibromobenzene. O-dibromobenzene is a colorless or light yellow liquid, soluble in ethanol, soluble in ether, acetone, benzene and carbon tetrachloride, insoluble in water, and can be used in organic synthesis or dye intermediates. |
| preparation | CN201710084081.1 provides a preparation method of o-dibromobenzene, which includes the following preparation steps: S1: add water in a reaction kettle, then add sodium nitrite while stirring, obtain sodium nitrite solution after complete dissolution, and put it in a barrel for later use; S2: add 18 parts of hydrobromic acid with a mass fraction of 48% into the reaction kettle, add 6 parts of o-bromoaniline under stirring, start freezing and cooling after the two are completely dissolved, and then drop to below 10 ℃, then add ice cubes from the manhole to cool down, drop 8 parts of sodium nitrite solution prepared in step S1 at a temperature of 0-5 ℃, and stir and cool for 1 hour after dropping; S3: filter to remove impurities in the temperature range of 0-5 ℃ to obtain diazonium salt solution; S4: add 7 parts of hydrobromic acid with a mass fraction of 48% into a reaction kettle equipped with a steam distillation device, add 3.5 parts of cuprous bromide under stirring, and dissolve completely to obtain a mixed solution; S5: The mixed solution in step S4 is heated to boiling, the diazonium salt solution prepared in step S3 is added dropwise, and o-dibromobenzene is evaporated at the same time. After dropwise addition, continue heating and carry out steam distillation until no oily liquid is produced; S6: the product obtained in step S5 is collected, the qualified product is washed, neutralized to a pH of 7, and finally dehydrated, and the unqualified product is de-rectified or water-distilled; S7: The residual liquid after distillation in step S5 is added with 18 times of water, stirred and cooled for 0.4 hours, and then centrifuged and dried to obtain cuprous bromide, which can be recycled. |
| use | used in organic synthesis, dye intermediates. |
| Production method | It is obtained by diazotization of o-bromoaniline and bromination of cuprous bromide. |
| category | flammable liquid |
| toxicity classification | poisoning |
| acute toxicity | abdominal cavity-mouse LD50: 780 mg/kg |
| flammability hazard characteristics | flammable; combustion produces toxic bromide gas |
| storage and transportation characteristics | warehouse ventilation and low temperature drying |
| fire extinguishing agent | dry powder, foam, sand, water |
Last Update：2024-04-09 15:16:46
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