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CAS No. : | 69189-19-1 | MDL No. : | MFCD16620247 |
Formula : | C8H7Br3 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | - |
M.W : | 342.85 | Pubchem ID : | 12496465 |
Synonyms : |
|
TPSA :Topological Polar Surface Area | 0 | H-Bond Acceptor Count : | 0 |
XLogP3 : | 3.7 | H-Bond Donor Count : | 0 |
SP3 : | 0.25 | Rotatable Bond Count : | 2 |
Signal Word: | Warning | Class | |
Precautionary Statements: | P280-P305+P351+P338 | UN#: | |
Hazard Statements: | H317-H319 | Packing Group: | |
GHS Pictogram: |
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Yield | Reaction Conditions | Operation in experiment |
---|---|---|
95% | With phosphorus tribromide In diethyl ether at 0℃; for 7.00 h; Reflux | To a solution of 11 (103 mg, 0.474 mM) in Et2O (3 mL) was slowly added a solution of PBr3 (0.16 mL,1.66 mM) in Et2O (0.25 mL) at 0 °C. The whole was refluxed for 7 h, poured to ice (ca 30 mL), andextracted with Et2O (20 mL × 3). The organic solutions were washed with brine (10 mL), dried, andevaporated. Purification of the residue by column chromatography (SiO2, hexane) gave 12 (154 mg,95percent) as colorless plates, mp 42-44 °C (lit [20]. mp 40-44 °C). |
84% | With N-Bromosuccinimide In dichloromethane at 20℃; for 6.00 h; | After dissolving Compound 3 (5.2 g, 23.9 mmol) in methylene chloride (50 milliliter), followed by adding N-bromosuccinimide (12.8 g, 71.7 mmol) at room temperature, and then the resultant solution was stirred for 6 hours. Water (200 milliliter) was poured in the resultant reaction solution, and the deposited solid was washed by ethanol, and as a result, Compound 4 was obtained. Product Amount: 6.9 g, Yield: 84 percent |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
93% | With N-Bromosuccinimide; 2,2'-azobis(isobutyronitrile) In tetrachloromethane for 1.00 h; Heating / reflux | 4-bromo-l,2-bis(bromomethyl)benzene (Q22). To a 1000 mL round bottom flask was added 4-brmo-oe-xylene <21) (0.0811 mol, 15.0Og), NBS (0.0426 mol, 7.580 g), 2,2 -azobisisobutyronitrile (0.00405 mol, 0.6650 g) and 500 mL of CCl4. The reaction mixture was then heated under reflux for Ih. After this time another amount of NBS and AIBN was added and repeated over four times in total. The precipitate was filtered off from the warm reaction mixture and the filtrate concentrated. Crude material was crystallized from hexanes to form white crystals (23 g, 93percent). 1H NMR (300 MHz, CDCl3) δ 7.53 (d, IH, ArH, J=2.0 Hz), 7.44 (dd, IH, ArH, J-8.1 Hz, J =2.0 Hz), 7.24 (d, IH, ArH, J=8.10), 4.60 (d, 4H, CH2, J=4.20 Hz) |
56.7% | With N-Bromosuccinimide; 2,2'-azobis(isobutyronitrile) In tetrachloromethane at 70℃; for 1.00 h; | Step A : 4-bromo-l,2-bis(bromomethyl)benzene A solution of 4-bromo-l,2-dimethylbenzene (2.0 g, 10.81 mmol) in carbon tetrachloride (70 mL) in a 250 mL round bottom flask was stirred at room temperature until all solids were dissolved. N-bromosuccinimide (4.81 g, 27.0 mmol) and 2,2'- azobis(2-methylpropionitrile) (0.044 g, 0.270 mmol) were added and mixture was heated to 70°C for 1 h. After cooling to room temperature, the mixture was filtered through celite bed. Celite bed was rinsed with carbon tetrachloride (3x50 mL). Combined filtrate was dried (sodium sulphate), filtered and concentrated under reduced pressure. The crude material was purified by combi- flash column chromatography (Column: 120 gm Red- Sep; eluent: hexane). The fractions were collected and concentrated under reduced pressure to yield 4-bromo-l,2-bis(bromomethyl) benzene (2.1 g, 56.7percent yield) as colorless gummy oil. 1H NMR (400 MHz, CDC13): δ 7.56-7.51 (m, 1H), 7.44-7.41 (m, 1H), 7.25- 7.22 (m, 1H), 4.59 (s, 2H), 4.578 (s, 2H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
95% | With phosphorus tribromide In diethyl ether at 0℃; for 7.00 h; Reflux | To a solution of 11 (103 mg, 0.474 mM) in Et2O (3 mL) was slowly added a solution of PBr3 (0.16 mL,1.66 mM) in Et2O (0.25 mL) at 0 °C. The whole was refluxed for 7 h, poured to ice (ca 30 mL), andextracted with Et2O (20 mL × 3). The organic solutions were washed with brine (10 mL), dried, andevaporated. Purification of the residue by column chromatography (SiO2, hexane) gave 12 (154 mg,95percent) as colorless plates, mp 42-44 °C (lit [20]. mp 40-44 °C). |
84% | With N-Bromosuccinimide In dichloromethane at 20℃; for 6.00 h; | After dissolving Compound 3 (5.2 g, 23.9 mmol) in methylene chloride (50 milliliter), followed by adding N-bromosuccinimide (12.8 g, 71.7 mmol) at room temperature, and then the resultant solution was stirred for 6 hours. Water (200 milliliter) was poured in the resultant reaction solution, and the deposited solid was washed by ethanol, and as a result, Compound 4 was obtained. Product Amount: 6.9 g, Yield: 84 percent |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
93% | With N-Bromosuccinimide; 2,2'-azobis(isobutyronitrile) In tetrachloromethane for 1.00 h; Heating / reflux | 4-bromo-l,2-bis(bromomethyl)benzene (Q22). To a 1000 mL round bottom flask was added 4-brmo-oe-xylene <21) (0.0811 mol, 15.0Og), NBS (0.0426 mol, 7.580 g), 2,2 -azobisisobutyronitrile (0.00405 mol, 0.6650 g) and 500 mL of CCl4. The reaction mixture was then heated under reflux for Ih. After this time another amount of NBS and AIBN was added and repeated over four times in total. The precipitate was filtered off from the warm reaction mixture and the filtrate concentrated. Crude material was crystallized from hexanes to form white crystals (23 g, 93percent). 1H NMR (300 MHz, CDCl3) δ 7.53 (d, IH, ArH, J=2.0 Hz), 7.44 (dd, IH, ArH, J-8.1 Hz, J =2.0 Hz), 7.24 (d, IH, ArH, J=8.10), 4.60 (d, 4H, CH2, J=4.20 Hz) |
56.7% | With N-Bromosuccinimide; 2,2'-azobis(isobutyronitrile) In tetrachloromethane at 70℃; for 1.00 h; | Step A : 4-bromo-l,2-bis(bromomethyl)benzene A solution of 4-bromo-l,2-dimethylbenzene (2.0 g, 10.81 mmol) in carbon tetrachloride (70 mL) in a 250 mL round bottom flask was stirred at room temperature until all solids were dissolved. N-bromosuccinimide (4.81 g, 27.0 mmol) and 2,2'- azobis(2-methylpropionitrile) (0.044 g, 0.270 mmol) were added and mixture was heated to 70°C for 1 h. After cooling to room temperature, the mixture was filtered through celite bed. Celite bed was rinsed with carbon tetrachloride (3x50 mL). Combined filtrate was dried (sodium sulphate), filtered and concentrated under reduced pressure. The crude material was purified by combi- flash column chromatography (Column: 120 gm Red- Sep; eluent: hexane). The fractions were collected and concentrated under reduced pressure to yield 4-bromo-l,2-bis(bromomethyl) benzene (2.1 g, 56.7percent yield) as colorless gummy oil. 1H NMR (400 MHz, CDC13): δ 7.56-7.51 (m, 1H), 7.44-7.41 (m, 1H), 7.25- 7.22 (m, 1H), 4.59 (s, 2H), 4.578 (s, 2H). |
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