3,5-Bis(trifluoromethyl)benzeneboronic acid Chemical Properties

Melting point:

217-220 °C (lit.)

Boiling point:

248.1±50.0 °C(Predicted)

Density 

1.50±0.1 g/cm3(Predicted)

storage temp. 

Keep in dark place,Sealed in dry,Room Temperature

solubility 

soluble in Methanol

form 

Crystals or Powder

pka

6.57±0.10(Predicted)

color 

White to light yellow

BRN 

7379990

InChI

InChI=1S/C8H5BF6O2/c10-7(11,12)4-1-5(8(13,14)15)3-6(2-4)9(16)17/h1-3,16-17H

InChIKey

BPTABBGLHGBJQR-UHFFFAOYSA-N

SMILES

B(C1=CC(C(F)(F)F)=CC(C(F)(F)F)=C1)(O)O

CAS DataBase Reference

73852-19-4(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

37/39-26

WGK Germany 

3

TSCA 

No

HazardClass 

IRRITANT

HS Code 

29163990

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

3,5-Bis(trifluoromethyl)benzeneboronic acid Usage And Synthesis

Chemical Properties

Off-white Cryst

Uses

suzuki reaction

Uses

Reactant involved in the synthesis of:

• Methylene-arylbutenones via carbonylative arylation of allenols
• 4-aminoquinoline analogs via Ullman / Suzuki / Negishi coupling
• Primary amino acid derivatives with anticonvulsant activity
• Alkyl arylcarbamates via Cu-catalyzed coupling with potassium cyanate
• Aryl-substituted succinimides and cyclic ketones by asymmetric conjugate addition
• Axially chiral dicarboxylic acids for asymmetric Mannich-type reactions

Synthesis

General procedure for the synthesis of 3,5-bis(trifluoromethyl)benzeneboronic acid from trimethyl borate, 3,5-bis(trifluoromethyl)bromobenzene, and electrophoretic-grade water: in a three-necked, dry, round-bottomed flask equipped with a rod-shaped magnetic stirrer, a 500-ml dropping funnel, condenser tube, and nitrogen introduction tube, 9.30 g of magnesium flakes were added under nitrogen protection and 220 ml of tetrahydrofuran (THF), which had been distillate-purified, were added ). The temperature of the reaction system was maintained in the range of 0 to 5°C by means of an ice bath. At this temperature, 44.0 mL of 3,5-bis(trifluoromethyl)bromobenzene was slowly added through a dropping funnel and the addition process was controlled to be completed within 1 hour. After the addition was completed, the reaction was slowly warmed to room temperature and continued for 16 hours to obtain a dark brown viscous solution. Subsequently, the reaction solution was cooled to -70°C in a dry ice/acetone bath and 28.97 mL of trimethyl borate was slowly added dropwise through a dropping funnel. After completion of the dropwise addition, the reaction solution was allowed to warm naturally to room temperature and the reaction was continued for 12 hours to obtain a brown viscous solution. Under cooling in an ice bath, 144.5 ml of 37 wt% aqueous hydrochloric acid solution was mixed with 63.3 ml of distilled water and slowly added to the reaction solution over a period of 1 hour, after which the reaction was continued for 24 hours. Upon completion of the reaction, the red organic layer was separated using a partition funnel. The organic layer was concentrated under reduced pressure to remove the solvent and the solid residue obtained was purified by recrystallization in distilled water. The resulting white crystals were collected, washed with petroleum ether and dried at room temperature for 24 hours to afford the target product 3,5-bis(trifluoromethyl)benzeneboronic acid (6FBB) (19.44 g, yield: 85%).

References

[1] Patent: KR2015/112649, 2015, A. Location in patent: Paragraph 0089; 0093-0095

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