1,4-DIBROMO-2,5-DIMETHYLBENZENE
2,5-dibromo-p-xylene
CAS: 1074-24-4
Molecular Formula: C8H8Br2
1,4-DIBROMO-2,5-DIMETHYLBENZENE - Names and Identifiers
| Name | 2,5-dibromo-p-xylene |
| Synonyms | 2,5-DIBROMO-4-XYLENE 2,5-dibromo-p-xylene 2,5-DIBROMO-P-XYLENE p-Xylene, 2,5-dibromo- 1,4-dibromo-2,5-dimethyl-benzen 2,5-Dibromo-1,4-dimethylbenzene 1,4-DIBROMO-2,5-DIMETHYLBENZENE 2,5-Dimethyl-1,4-dibromobenzene 1,4-Dibromo-2,5-dimethylbenzene Benzene,1,4-dibromo-2,5-dimethyl- benzene, 1,4-dibromo-2,5-dimethyl- |
| CAS | 1074-24-4 |
| EINECS | 214-038-2 |
| InChI | InChI=1/C8H8Br2/c1-5-3-8(10)6(2)4-7(5)9/h3-4H,1-2H3 |
1,4-DIBROMO-2,5-DIMETHYLBENZENE - Physico-chemical Properties
| Molecular Formula | C8H8Br2 |
| Molar Mass | 263.96 |
| Density | 1.7485 (rough estimate) |
| Melting Point | 72-74°C(lit.) |
| Boling Point | 261°C(lit.) |
| Flash Point | 124.2°C |
| Water Solubility | Soluble in toluene, hot ethanol and hot methanol.Insoluble in water. |
| Vapor Presure | 0.0195mmHg at 25°C |
| Appearance | Bright yellow crystal |
| Color | White to Light yellow |
| BRN | 2080433 |
| Storage Condition | Sealed in dry,Room Temperature |
| Refractive Index | 1.543-1.545 |
| MDL | MFCD00000091 |
1,4-DIBROMO-2,5-DIMETHYLBENZENE - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 2811 6.1/PG 1 |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 29039990 |
1,4-DIBROMO-2,5-DIMETHYLBENZENE - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| application | 2,5-dibromo-1, 4-dimethylbenzene is mainly used to produce nylon MXD6 in addition to being used to synthesize epoxy resin curing agent and intermediate of m-xylene dicyanate. it has broad market prospects and is an important fine chemical intermediate that needs to be developed urgently in China. |
| Preparation | Add iron powder (2.27g) to the solution of p-xylene (140 ml, 120g, 1.13 mol) in CH2Cl2(300 ml). At 0°C, slowly drip bromine was added and stirred at room temperature for 16 hours. Wash with 2N NaOH(300ml) and saturated NaCl solution, dry with Na2SO4, and remove the solvent under vacuum. The crude product was recrystallized with ethanol. 274g(1.04mol,92%) of 2, 5-dibromo-1, 4-dimethylbenzene was obtained as a white crystalline solid. The melting point is 72 degrees Celsius. |
Last Update：2024-04-09 20:52:54
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