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CAS No. : | 24078-12-4 | MDL No. : | MFCD07787171 |
Formula : | C8H7BrO | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | RCBPVESMGNZMSG-UHFFFAOYSA-N |
M.W : | 199.04 | Pubchem ID : | 13555150 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | 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 |
---|---|---|
78% | [00281] 28B. 4-bromo-2-methylbenzaldehyde: To a solution of oxalyl chloride (249 mL, 497 mmol) in CH2CI2 (150 mL) at -78 C under argon was added a solution of DMSO (42.4 mL, 597 mmol) in CH2C12 (75 mL) dropwise with a venting needle (Note: gas was generated, slow addition was necessary). After the addition, the venting needle was removed. The reaction mixture was stirred at -78 C under argon for 30 min. Then, a solution of 28A (20.0 g, 99.0 mmol) in CH2C12 (203 mL) was added. The resulting solution was stirred at -78 C for 30 min and then TEA (166 mL, 1190 mmol) was added dropwise. The reaction mixture was warmed to rt and stirred for 12 h. The reaction mixture was diluted with water (20 mL) and CH2C12 (30 mL). The layers were separated and the aqueous layer was extracted with CH2C12 (3 x 50 mL). The combined organic extracts were washed with water and brine, dried (MgSC^), filtered, and concentrated. The crude product was purified by flash chromatography to provide 28B (15.4 g, 78 mmol, 78 % yield) as a yellow oil. lH NMR (400 MHz, CDC13) delta 10.22 (s, 1H), 7.66 (d, J= 8.28 Hz, 1H), 7.51 (dd, J= 8.28, 1.76 Hz, 1H), 7.45 (s, 1H), 2.65 (s, 3H). | |
73% | To a solution of ID (9.30 g, 46.3 mmol) in CH2CI2 (200 mL) under argon was added oxalyl chloride (10.1 mL, 116 mmol) at -78 C; then DMSO (9.85 mL, 139 mmol) was added dropwise with a venting needle. After the addition was complete, the venting needle was removed and the reaction mixture was stirred at -78 C under argon for 30 min. Then, NEt3 (38.7 mL, 278 mmol) was added dropwise. After stirring at the same temperature for 3 h, the reaction mixture was diluted with water (20 mL) and CH2C12 (50 mL) and the layers were separated. The aqueous layer was further extracted with CH2CI2 (3 x 100 mL) and the combined organic extracts were washed with water and brine, dried over MgS04, filtered, and concentrated. The crude product was purified by silica chromatography to give IE (yellow oil, 6.70 g, 33.7 mmol, 73% yield). 1H NMR (400 MHz, CDC13) delta 10.22 (1 H, s), 7.66 (1 H, d, J=8.28 Hz), 7.51 (1 H, dd, J=8.28, 1.76 Hz), 7.45 (1 H, s), 2.65 (3 H, s). | |
With pyridinium chlorochromate; In dichloromethane; at 20℃; for 1h; | [0453] Experimental Details: A solution of 2.4g (11.9mmol) of compound 2 in20ml of DCM was added a slurry of 5.1g(23.8mmol) of PCC in 60ml of DCM. The reaction solution was stirred for lhour at r.t. diluted with 300ml OfEt2O and filtered. The filtrate was concentrated to give compound 3. |
With pyridinium chlorochromate; In dichloromethane; at 20℃; for 1h; | Experimental Details: A solution of 2.4 g (11.9 mmol) of compound 2 in 20 ml of DCM was added a slurry of 5.1 g (23.8 mmol) of PCC in 60 ml of DCM. The reaction solution was stirred for 1 hour at r.t. diluted with 300 ml of Et2O and filtered. The filtrate was concentrated to give compound 3. | |
With manganese(IV) oxide; In dichloromethane; at 20℃; for 72h; | Manganese dioxide (360 g, 4.1 mol) was added to a solution of (4-bromo-2-methylphenyl)methanol (91.5 g, 455 mmol) in dichloromethane (500 mL) and the reaction was stirred at room temperature for 72 h. The reaction mixture was filtered through Celite and the filtrate was concentrated in vacuo. The residue was purified via chromatography (5% ethyl acetate/hex), providing the product, 4-bromo-2-methylbenzaldehyde, as a yellow solid. 1H NMR (400 MHz, CDCl3) delta 2.64 (s, 3H), 7.43 (s, 1H), 7.49 (d, J=8.3 Hz, 1H), 7.65 (d, J=8.3 Hz, 1H), 10.20 (s, 1H). | |
With Dess-Martin periodane; In dichloromethane; at 0 - 30℃; for 1h; | To the solution of (4-bromo-2-methylphenyl)methanol (1.8 g, 8.1 mmol) in CH2C12 (20 mL) was added Dess-Martin Periodinane (5,1 g, 12.1 mmol) at 0C. The mixture was stirred at RT for 1 h, then diluted with water, and the solid was removed by filtration. The filtrate was extracted with CH2C12. The combined organic layer was washed with brine, dried over Na2S04 and concentrated in vacuo. Purification by normal phase silica gel column provided 4-bromo-2- methylbenzaldehyde as a yellow oil. |