ALPHA,O-DIBROMOTOLUENE
2-Bromobenzyl bromide
CAS: 3433-80-5
Molecular Formula: C7H6Br2
ALPHA,O-DIBROMOTOLUENE - Names and Identifiers
ALPHA,O-DIBROMOTOLUENE - Physico-chemical Properties
| Molecular Formula | C7H6Br2 |
| Molar Mass | 249.93 |
| Density | 1.8246 (rough estimate) |
| Melting Point | 29-32 °C (lit.) |
| Boling Point | 129 °C/19 mmHg (lit.) |
| Flash Point | >230°F |
| Water Solubility | Insoluble in water. |
| Solubility | dioxane: soluble1g/10 mL, clear, colorless |
| Vapor Presure | 0.0298mmHg at 25°C |
| Appearance | White crystal |
| Color | Clear colorless to yellow |
| BRN | 971015 |
| Storage Condition | Inert atmosphere,Room Temperature |
| Refractive Index | n20/D 1.619(lit.) |
| MDL | MFCD00000173 |
| Physical and Chemical Properties | Melting point 29-32°C boiling point 129°C (19 mmHg) refractive index 1.617-1.619 |
| Use | For Organic synthesis |
ALPHA,O-DIBROMOTOLUENE - Risk and Safety
| Risk Codes | R34 - Causes burns R37 - Irritating to the respiratory system R23 - Toxic by inhalation |
| 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. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S22 - Do not breathe dust. |
| UN IDs | UN 3261 8/PG 3 |
| WGK Germany | 3 |
| FLUKA BRAND F CODES | 8-19 |
| TSCA | Yes |
| HS Code | 29036990 |
| Hazard Class | 8 |
| Packing Group | III |
ALPHA,O-DIBROMOTOLUENE - 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 | 2-benzyl bromide is a colorless to yellowish transparent liquid or white crystal with a melting point of 31 ℃, a boiling point of 129 ℃,120-130 ℃, and a refractive index of 1.6193. it can be miscible with alcohol, ether, acetic acid and carbon disulfide. it decomposes during atmospheric distillation and volatilizes with water vapor. benzyl o-bromide is a very important chemical raw material for organic synthesis, it has a wide range of uses and the demand for industrial production is relatively large. |
| use | 2-benzyl bromide is also called o-benzyl bromide and o-benzyl bromide. o-benzyl bromide is a very important chemical raw material for organic synthesis. it has a wide range of uses and the demand for industrial production is relatively large. Pharmaceutical intermediates. for organic synthesis |
| preparation | in the reaction bottle, 15g of toluene is added into 100mL of glacial acetic acid, 3g of iron powder of positioning catalyst is added, 8mL of bromine is slowly added dropwise at room temperature, the dropwise addition is completed for about 30min, the reaction is carried out for 5h after heating to 40 ℃, and then the reaction is carried out under a 300W tungsten lamp for 5h. TLC monitors the complete reaction of the raw materials, the solvent glacial acetic acid was evaporated under vacuum, a certain amount of sodium hydroxide solution with a mass concentration of 20% was added to the concentrate, the reaction solution was filtered, the filtrate was extracted three times with dichloromethane, and the organic phase was combined. The organic phase was dried by anhydrous sodium sulfate and concentrated to obtain 24g o-benzyl bromide. 1HNMR(400MHz,CDCl3)δ:7.51(d,J = 12.0Hz,1H),7.27-7.23(m,3H),4.37(s,2H). |
| Production method | is obtained by bromination of o-bromotoluene. The o-bromotoluene in the reaction pot is irradiated with a fluorescent lamp, bromine is slowly added dropwise at 160-180 ℃, and the tail gas is absorbed with water. After adding, the reaction continues for 0.5h. Hydrogen bromide and low boiling substances (120 ℃,<8.0kPa) are drained under reduced pressure, cooled to below 40 ℃, and discharged to obtain o-bromobenzyl bromide. |
Last Update：2024-04-09 15:16:50
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