11 Ion Analysis



Anion Eliminator

  • Product code
    T037  TFPB
  • CAS No.
  • Chemical name
    Tetrakis[3,5-bis(trifluoromethyl)phenyl]borate, sodium salt
  • MW
Unit size Price Item Code
100 mg $162.00 T037-10
100 mg
Quantity may be adjusted within the cart.


Tetraphenylborate is unstable in acidic conditions because protons attack the ipso-carbon of the phenyl group and benzene is released. However, the electron density of the ipso-carbon of TFPB is low due to a trifluoromethyl group. Thus TFPB is stable in acidic conditions (such as 50 mM sulfuric acid solution). TFPB is used in Friedel-Craft alkylation or diazo coupling reactions as a phase transfer reagent. It is also used for ion selective electrodes. TFPB is known as Kobayashi’s reagent.


Open References

1) H. Kobayashi, T. Sonoda, H. Iwamoto and M. Yoshimura, "Tetrakis[3,5-di(F-methyl) phenyl] borate as the First Efficient Negatively Charged Phase Transfer Catalyst. Kinetic Evidences", Chem. Lett., 1981, 579. 
2) H. Kobayashi, T. Sonoda and H. Iwamoto, "The First Application of Anion-catalyzed Phase-transfer Catalysis to Friedel-Crafts Alkylation", Chem. Lett.1982, 1185. 
3) Y. Takahashi, N. Yoneda and H. Nagai, "Facile and Highly Selective Synthesis of 2,2-Dialkyl-1,5-Lactones by the Calboxylation of Primary, Tertiary-1,4-Diols with Formic Acid or Copper(I)Carbonyls in the Presence of Concentrated Sulfuric Acid", Chem. Lett., 1982, 1187. 
4) H. Iwamoto, M. Yoshimura, T. Sonoda and H. Kobayashi, "Anion-Catalyzed Phase-Transfer Catalysis. I. Application to Diazo-Coupling Reactions", Bull. Chem. Soc. Jpn.,1983, 56, 796. 
5) H. Iwamoto, T. Sonoda and H. Kobayashi, "Diazotization of Pentafluoroaniline by Means of Anion-Catalyzed Phase Transfer Catalysis in a Hydrophobic Organic Solvent", J. Fluorine Chem., 198424, 535. 
6) H. Nishida, N. Takada, M. Yoshimura, T. Sonoda and H. Kobayashi, "Tetrakis[3,5-bis(trifluoromethyl)phenyl]borate. Highly Lipophilic Stable Anionic Agent for Solvent-extraction of Cations", Bull. Chem. Soc. Jpn.198457, 2600. 
7) Y. Shiraki, K. Onitsuka, K. Takuma, T. Sonoda and H. Kobayashi, "Anion-Catalyzed Phase-Transfer Catalysis. II. Effects of Anionic Tetrakis[3,5-Bis(Trifluoromethyl)Phenyl]Borate Catalyst in Phase-Transfer-Catalyzed Sulfonium Ylide Formation", Bull. Chem. Soc. Jpn.198558, 3041. 
8) N. Ishibashi, T. Imato, G. H. Zhang, Y. Asano, T. Sonoda and H. Kobayashi, "Vitamin B1-Sensitive Poly(vinyl chloride) Membrane Electrode Based on Hydrophobic Tetraphenylborate Cation Exchangers", Anal. Sci.19884, 527. 
9) G. H. Zhang, T. Imato, Y. Asano, T. Sonoda, H. Kobayashi and N. Ishibashi, "Vitamin B1-Sensitive Poly(vinyl chloride) Membrane Electrode Based on Hydrophobic Tetraphenylborate Derivatives and Their Application", Anal. Chem., 199062, 1644. 
10) T. Nagamura, Y. Isoda, K. Sakai and T. Ogawa, "Control of Molecular Orientation of 4,4'-Bipyridinium Cation Radicals in Novel Photochromic Monolayer Assemblies", J. Chem. Soc. Chem. Commun., 1990, 703. 
11) T. Nagamura and Y. Isoda, "Novel Photochromic Polymer Films Containing Ion-pair Charge-transfer Complexes of 4,4'-Bipyridinium Ions for Optical Recording", J. Chem. Soc. Chem. Commun., 1991, 72. 
12) M. Kira, T. Hino and H. Sakurai, "An NMR Study of the Formation of Silyloxonium Ions by Using Tetrakis[3, 5-Bis(Trifluoromethyl)Phenyl]Borate as Counteranion", J. Am. Chem. Soc.1992114, 6697. 

Handling and storage condition

Appearance: White crystalline powder
Purity (Absorbance): ≧ 99.0 % (as anhydrous)
Solubility in diethyl ether: To pass test (clear, colorless)
Water content: 4.5~5.5%
IR spectrum: Authentic
Handling and storage condition
Ambient temperature

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