CAS RN: 153254-09-2 | Product Number: B3022
2,4-Bis(trifluoromethyl)phenylboronic Acid (contains varying amounts of Anhydride)
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|Appearance||White to Light yellow powder to crystal|
|Purity(Neutralization titration)||97.0 to 108.0 %|
|Solubility (soluble in)||Methanol|
|Hazard Statements||H315 : Causes skin irritation.
H319 : Causes serious eye irritation.
|Precautionary Statements||P264 : Wash skin thoroughly after handling.
P280 : Wear protective gloves/ eye protection/ face protection.
P302 + P352 : IF ON SKIN: Wash with plenty of water.
P337 + P313 : If eye irritation persists: Get medical advice/ attention.
P362 + P364 : Take off contaminated clothing and wash it before reuse.
P332 + P313 : If skin irritation occurs: Get medical advice/ attention.
To a solution of benzoic acid (122 mg, 1.0 mmol) and benzylamine (107 mg, 1.0 mmol) in fluorobenzene (5 mL, 0.2 mol/L) was added molecular sieves 3A (2 g) at room temperature. After that 2,4-bis(trifluoromethyl)phenylboronic acid (13 mg, 0.05 mmol) was added to the reaction mixture and stirred at reflux temperature for 24 hours. The reaction mixture was filtered on celite pad and washed with EtOAc. The filtrate was washed with 2 mol/L HCl aq. (30 mL), saturated NaHCO3 aq. (30 mL), and brine (30 mL), dried over sodium sulfate and filtered. The solvent was removed under reduced pressure to give N-benzylbenzamide as a white solid (135 mg, 64%).
The reaction mixture was monitored by LC.
1H NMR (270 MHz, DMSO-d6); δ 9.05 (brt, 1H, J = 5.4 Hz), 7.90 (dd, 1H, J = 7.3, 1.6 Hz), 7.56-7.44 (m, 3H), 7.36-7.32 (m, 4H), 7.25 (q, 1H, J = 7.3 Hz).
- The ortho-substituent on 2,4-bis(trifluoromethyl)phenylboronic acid catalyzed dehydrative condensation between carboxylic acids and amines
Safety Data Sheet (SDS)
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