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1,4-dibromobenzene
| Product name | 1,4-dibromobenzene |
| English alias | p-Dibromo Benzene |
| Structural formula | .png) |
| Molecular formula | C6H4Br2 |
| Molecular weight | 235.90400 |
| Appearance | White to light yellow crystalline powder |
| Melting point | 86-89 ℃ |
| Relative density | 1.84 |
| Boiling point | 219 ℃ |
| Water solubility | Insoluble. |
| Refractivity | 1.5742 |
| Content | ≥99.0% |
| Moisture | ≤0.05% |
| Stability | Stable. Combustible. Incompatible with strong oxidizing agents. |
| Flash point | 219-220℃ |
| Vapor pressure | 10 mm Hg ( 40 ℃) |
| Storage | Ventilation and low-temperature drying in the warehouse |
| Use | This product is used in organic synthesis and can also be used as a dye intermediate. |
| Production method | Add 2g of iron filings to 1mol of benzene and slowly add bromine dropwise. Generally, the reaction begins after 15 minutes (slow boiling), and the bromine addition rate is controlled to maintain a slight boiling of the reactants. After adding bromine, heat at 20-30 ℃ for 1 hour, then heat at 60 ℃ for 45 minutes until the brown vapor of bromine disappears. Filter out the iron filings, wash them with water, and then steam them. The brominated benzene distilled from the first part is removed from the water layer, dried with calcium chloride, and then distilled. The main fraction collected at 150-170 ℃ is brominated benzene. The residue after distillation is poured into a porcelain dish while hot, condensed, and combined with the p-dibromobenzene obtained from steam distillation. After drying, it is recrystallized with activated carbon and methanol to obtain 24g of p-dibromobenzene with a yield of 10%. |
| UN No. | UN 2711 |
| Hazard class | 9 |
| Packing group | III |
| HS code | 29036990 |
| Packing | 25KGS/cardboard drum |
| CAS # | 106-37-6 |
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