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Tetrabutylammonium bromide

Physical and Chemical Properties Application Uses preparation Toxicity
Tetrabutylammonium bromide
Tetrabutylammonium bromide structure
Chemical Name:
Tetrabutylammonium bromide
TBAB;TABA;TBABr;Bu4NBr;IPC-TBA-BR;N4,4,4,4Br;Tetrabutyl;aliquat 100;TBAB solution;ALIQUAT(R) 100
Molecular Formula:
Formula Weight:
MOL File:

Tetrabutylammonium bromide Properties

Melting point:
102-106 °C(lit.)
Boiling point:
102 °C
1.039 g/mL at 25 °C
refractive index 
n20/D 1.422
Flash point:
storage temp. 
Store below +30°C.
H2O: 0.1 g/mL, clear, colorless
Crystalline Powder
Specific Gravity
White to slightly cream
Amine like
Water Solubility 
600 g/L (20 ºC)
λ: 240 nm Amax: 0.04
λ: 250 nm Amax: 0.03
λ: 260 nm Amax: 0.02
λ: 500 nm Amax: 0.02
Stable. Incompatible with strong oxidizing agents. Protect from moisture.
CAS DataBase Reference
1643-19-2(CAS DataBase Reference)
NIST Chemistry Reference
Tetra-N-butylammonium bromide(1643-19-2)
EPA Substance Registry System
Tetrabutylammonium bromide (1643-19-2)
  • Risk and Safety Statements
Signal word  Warning
Hazard statements  H302-H319-H335-H315
Precautionary statements  P301+P312+P330-P305+P351+P338-P261-P280a-P304+P340-P405-P501a-P264-P270-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313-P501
Hazard Codes  Xi,Xn
Risk Statements  36/37/38-22
Safety Statements  26-36-37/39
WGK Germany  3
Hazard Note  Irritant
HS Code  29239000

Tetrabutylammonium bromide price More Price(30)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 8.18839 Tetra-n-butylammonium bromide for synthesis 1643-19-2 10 g $17.76 2021-03-22 Buy
Sigma-Aldrich 193119 Tetrabutylammonium bromide ReagentPlus , ≥99.0% 1643-19-2 25g $39.5 2021-03-22 Buy
Sigma-Aldrich 8.18839 Tetra-n-butylammonium bromide for synthesis 1643-19-2 50 g $45.32 2021-03-22 Buy
Sigma-Aldrich 86857 Tetrabutylammonium bromide suitable for ion pair chromatography, LiChropur?, ≥99.0% 1643-19-2 10 g $134 2021-03-22 Buy
Sigma-Aldrich 8.18839 Tetra-n-butylammonium bromide for synthesis 1643-19-2 250 g $155.4 2021-03-22 Buy

Tetrabutylammonium bromide Chemical Properties,Uses,Production

Physical and Chemical Properties

Tetrabutylammonium bromide, also known as tetrabutylammonium bromide. White crystal, deliquescence. 118 ℃ melting point. Soluble in water, alcohol, ether and acetone, slightly soluble in benzene.

Figure 1:  a structural formula of tetrabutylammonium bromide


(1) Used as a reagent for the analysis of organic synthesis.
(2) Tetrabutylammonium bromide is also an effective phase transfer catalyst.
Phase transfer catalyst, referred to as PTC, is able to transfer the aqueous phase (or organic phase) to the organic phase (or aqueous phase) catalyst, which can make the reaction between the aqueous phase and the organic phase of the catalyst. PTC has the function of changing the degree of ion solvation, increasing the activity of ion reaction, speeding up the reaction rate and so on. Solve the problem of the past in the two phases of the reaction is difficult to react.
Common quaternary ammonium salt phase transfer catalysts are: benzyl triethyl ammonium chloride, trioctyl methyl ammonium chloride, tetramethyl ammonium bromide, tetrapropylammonium chloride, tetrabutylammonium bromide , tetrabutyl ammonium iodide, benzyl triethyl ammonium bromide, triethyl hexyl bromide, octyl triethylammonium bromide.
Phase transfer catalyst is widely applied in organic synthesis: R2C for preparing compounds (carbene type compound), further preparation of the corresponding nitrile, isonitrile, Halon, dichloromethane cyclopropane derivatives, hydroxy acids and diazomethane. For the alkylation reaction, compared with traditional methods, to avoid the harsh conditions of dry operation, and high yield, it can also be used in the redox reaction, ester hydrolysis, substitution reaction, condensation reaction, addition reaction, polymerization reaction, addition reaction of carbon and the elimination of reaction and so on.
(3) For organic synthesis intermediates, phase transfer catalyst
(4) Ion-pairing reagents for the synthesis of bacampicillin, sultamicillin like.
(5) Ion pair chromatography reagents, phase transfer catalyst. Bacampicillin, sultamicillin like synthesis.


Tetrabutylammonium bromide (TBAB) is a quaternary ammonium compound. It is the most widely used phase transfer catalyst. Its interfacial properties have been studied in case of hydroxide initiated reactions. This may be applied in understanding the mechanism of phase transfer reactions. TBAB is reported to decrease retention time and remove peak tailing by acting as an ion pair reagent during the chromatographic analysis of quaternary ammonium compounds. In the molten state TBAB behaves like an ionic liquid which is a promising green alternative to organic solvents in organic synthesis. Its molar heat capacity, entropy and free energy function have been determined.
Recently, molten tetrabutylammonium bromide (TBAB) was used as a low toxic and cost-effective IL in a number of constructive synthetic transformations.
Tetrabutylammonium bromide (TBAB) may be used in the molten state in the following processes:
Synthesis of (2S)-5-(3-phenyl-2-phthalimidylpropanoylamino)isophthalic acid.
Synthesis of alkyl-substituted pyrroles in the absence of catalyst and organic solvent.
Synthesis of dithioacetals from acetals by transthioacetalisation in a solvent free environment.
Synthesis of polyamides (PAs) by the polymerization of terephthalic acid and diisocyanates.
Catalyze the addition of thiols to conjugated alkenes.
Dehydrochlorination of poly(vinyl chloride).


Preparative Methods: several methods are available to recover the quaternary ammonium ion efficiently.Prepared by reaction of tri-n-butylamine and n-butyl bromide.


The acute oral LD50 (mouse): 590mg/kg. Inhalation, ingestion and skin contact toxic to the skin, eyes and respiratory system irritation.
More information from the ChemicalBook Xiaonan editor (2015-09-16).

Chemical Properties

white crystals or powder


PTC catalyst 


ChEBI: A tetrabutylammonium salt with bromide as the anionic counterpart.

Purification Methods

Crystallise the salt from *benzene (5mL/g) at 80o by adding hot n-hexane (three volumes) and allowing to cool. Dry it over P2O5 or Mg(ClO4)2, under vacuum. The salt is very hygroscopic. It can also be crystallised from ethyl acetate or dry acetone by adding diethyl ether and dried in vacuo at 60o for 2 days. It has been crystallised from acetone by addition of diethyl ether. It is so hygroscopic that all manipulations should be carried out in a dry-box. It has been purified by precipitation from a saturated solution in dry CCl4 on addition of cyclohexane or by recrystallisation from ethyl acetate, then heating in vacuum to 75o in the presence of P2O5. [Symons et al. J Chem Soc, Faraday Trans 1 76 2251 1908.] It also recrystallises from CH2Cl2/diethyl ether and is dried in a vacuum desiccator over P2O5. [Blau & Espenson J Am Chem Soc 108 1962 1986, Beilstein 4 IV 657.]

Tetrabutylammonium bromide Preparation Products And Raw materials

Raw materials

Preparation Products

Tetrabutylammonium bromide Suppliers

Global( 720)Suppliers
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Hubei Jusheng Technology Co.,Ltd.
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View Lastest Price from Tetrabutylammonium bromide manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-11-08 Tetrabutylammonium bromide
US $10.00 / KG 1KG 99% 20 tons Wuhan wingroup Pharmaceutical Co., Ltd
2021-08-13 Tetrabutylammonium bromide
US $10.00 / KG 10g 99 50 Ton/Tons per Month Shijiazhuang tongyang Import and Export Co., LTD
2021-07-13 Tetrabutylammonium bromide
US $15.00-10.00 / KG 1KG 99%+ HPLC Monthly supply of 1 ton Zhuozhou Wenxi import and Export Co., Ltd

Tetrabutylammonium bromide Spectrum

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