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Simple use and storage method of sodium tetraphenylborate

Nov. 28, 2019

Sodium tetraphenylborate, white solid, odorless, and aniline smell in the deteriorated product. Soluble in water to identify potassium ions. Soluble in water, ethanol, methanol, ethanol and acetone, slightly soluble in benzene and chloroform, almost insoluble in petroleum ether.

Polyesterification catalyst for preparing carbonate by transesterification. It is also used for the determination of potassium, sodium and chiri chloride-containing organic compounds, such as the analysis of potassium in manure and blood. Determination of potassium by gravimetry and titration. Associative precipitation of large cations such as alkaloids and quaternary ammonium salts.

Identification of potassium ions

Sodium tetraphenylborate is a cheap and sensitive reagent for detecting potassium. In neutral, alkaline or acetic acid solutions, sodium tetraphenylborate will react quantitatively with potassium ions to form white precipitated potassium tetraphenylborate that is difficult to dissolve in water:

K + + [B (C6H5) 4]-→ K [B (C6H5) 4] ↓

The detection limit of the reaction was 1 μg, and the minimum potassium ion concentration was 2 μg / mL. Ammonium ions, rubidium ions, and cesium ions also generate similar precipitates. Generally, ammonium ions need to be removed in advance by burning (because the ammonium salt is unstable and easily decomposed during burning), rubidium ions and cesium ions can also be precipitated in advance Remove.

Another commonly used reagent for identifying potassium ions is sodium cobalt nitrite, which can produce a yellow crystalline precipitate with potassium ions, and its main interfering ions are also ammonium ions.

Organic Synthesis

In acetonitrile solution, sodium tetraphenylborate interacts with acid chloride and tertiary amine, and sodium chloride precipitates out to obtain N-acyl quaternary ammonium salt:

RC (O) Cl + R3'N + NaBPh4 → [RC (O) NR3 '] [BPh4] + NaCl

As a phenyl donor, sodium tetraphenylborate can be cross-coupled with vinyl trifluoromethanesulfonate or aryl ester under palladium catalysis to produce aryl olefins or biphenyl derivatives in high yield.


Sodium tetraphenylborate has high solubility in non-polar solvents and is easy to crystallize, so it can be used to prepare and separate some organometallic complexes.


Store in a cool, ventilated warehouse. The storage temperature should not exceed 37 ° C. It should be stored separately from oxidants and edible chemicals. Keep container tightly closed. Keep away from fire and heat sources. The warehouse must be equipped with lightning protection equipment. The exhaust system shall be provided with a grounding device to conduct static electricity. Adopt explosion-proof lighting and ventilation settings. Never use spark-prone equipment and tools. The storage area should be equipped with spill emergency treatment equipment and suitable containment materials.

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