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CAS No. : | 100189-84-2 | MDL No. : | MFCD00079745 |
Formula : | C8H8Br2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | XXFGKGMZLZIPCN-UHFFFAOYSA-N |
M.W : | 263.96 | Pubchem ID : | 2758047 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | |
Hazard Statements: | H302+H312+H332-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
72% | 4-Bromo-2,6-dimethylaniline (6.00 g, 30 mmol) was suspended in 48% HBr aqueous solution (20 mL), NaNO 2 (2.28 g, 33 mmol) dissolved in water at -10 C. was added and stirred for 1 hour And sulfamic acid (0.58 g, 6 mmol) was added. This was treated with FeSO 4 .7H 2 O (4.17 g, 15 mmol) in 48% HBr aqueous solution (20 mL) and heated gradually to 80 C., and the mixture was stirred at 80 C. for 1 hour. Water was added to the mixture, the mixture was extracted with hexane, and the organic phase was dried with anhydrous Na 2 SO 4, then the solvent was removed under reduced pressure. Purification with medium pressure (silica gel, hexane) gave 2,5-dibromo-m-xylene (6.19 g, 72% yield). | |
72% | 4-Bromo-2,6-dimethylaniline (6.00 g, 30 mmol) was suspended in 48% HBr aqueous solution (20 mL), NaNO 2 (2.28 g, 33 mmol) dissolved in water at -10 C. was added and stirred for 1 hour And sulfamic acid (0.58 g, 6 mmol) was added. This was treated with FeSO 4 .7H 2 O (4.17 g, 15 mmol) in 48% HBr aqueous solution (20 mL) and heated gradually to 80 C., and the mixture was stirred at 80 C. for 1 hour. Water was added to the mixture, the mixture was extracted with hexane, and the organic phase was dried with anhydrous Na 2 SO 4, then the solvent was removed under reduced pressure. Purification with medium pressure (silica gel, hexane) gave 2,5-dibromo-m-xylene (6.19 g, 72% yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
47% | Step 1: A solution of <strong>[100189-84-2]2,5-dibromoxylene</strong> (2.0 g, 7.6 mmol) in DCM (20 ml) was treated with n-BuLi (2.5 M solution in hexane, 3 ml, 1.0 equiv.) at -78C. After stirring for 1h, DMF (1.8 ml, 23 mmol, 3 eq.) was added and the solution was allowed to warm to room temperature. It was acidified to pH 2 with 5% hydrochloric acid and extracted with diethyl ether (3x50 ml). The combined organic phase was dried and evaporated and the residue was purified by column chromatography using PE:EA = 10:1 as eluent to give 4-bromo-3,5-dimethylbenzaldehyde (0.76 g, yield: 47%). | |
A solution of <strong>[100189-84-2]2,5-dibromoxylene</strong> (8.0 g, 30.3 mmol) in diethyl ether (120 mL) is cooled to -78 C. and then treated with n-buthyllithium (20 mL, 1.6 M in hexane). After stirring for 40 min, DMF (6 mL) is slowly added. The mixture is warmed to rt and stirred for 1 h. The mixture is cooled again to -78 C. before another portion of n-butyllithium (5 mL) is added. The reaction mixture is allowed to warm to rt and stirred for another hour. The reaction is quenched by adding 5% aq. HCl. The mixture is extracted with EA, and the extract is concentrated in vacuo. The crude product is purified by CC on silica gel eluting with heptane:EA 5:1 to give 4-bromo-3,5-dimethyl-benzaldehyde (8.2 g) as a white soft solid. | ||
A solution of <strong>[100189-84-2]2,5-dibromoxylene</strong> (8.0 g, 30.3 mmol) in diethyl ether (120 ml_) is cooled to -78C and then treated with n-buthyllithium (20 ml_, 1.6 M in hexane). After stirring for 40 min, DMF (6 ml_) is slowly added. The mixture is warmed to rt and stirred for 1 h. The mixture is cooled again to -78C before another portion of n- butyllithium (5 ml_) is added. The reaction mixture is allowed to warm to rt and stirred for another hour. The reaction is quenched by adding 5% aq. HCI. The mixture is extracted with EA, and the extract is concentrated in vacuo. The crude product is purified by CC on silica gel eluting with heptane:EA 5:1 to give 4-bromo- 3,5-dimethyl-benzaldehyde (8.2 g) as a white soft solid. |
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