Sodium tetraphenylborate
Sodium tetraphenylborate (CAS 143-66-8) is a versatile inorganic salt with the linear formula (C₆H₅)₄BNa and a molecular weight of 342.22 g/mol. It is widely recognised for its utility in analytical chemistry as a precipitating agent for potassium and ammonium ions. In organic synthesis, it serves as a crucial reagent for forming stable N-acylammonium salts and coupling with triflates to produce valuable arylalkenes and biaryls.
- IUPAC
- Tetraphenylboron sodium
- Synonyms
- Tetraphenylboron sodiumSodium tetraphenylboronBorate(1-), tetraphenyl-, sodium

Precipitating Agent
Sodium tetraphenylborate is an effective reagent for the gravimetric determination and separation of potassium and ammonium ions from aqueous solutions due to the formation of insoluble tetraphenylborate salts.
Organic Synthesis
It facilitates the generation of stable N-acylammonium salts through ion exchange and is used in coupling reactions with vinyl and aryl triflates to synthesise arylalkenes and biaryls.
Catalysis
As a boron-containing compound, it finds application in various catalytic processes, contributing to advancements in inorganic chemistry and chemical synthesis.
| Molecular weight | 342.22 |
|---|---|
| Linear formula | (C6H5)4BNa |
| Assay | ≥99.5% |
| Grade | ACS reagent |
| Loss on drying | ≤0.5% loss on drying |
| Application | Generates stable, crystalline N-acylammonium salts by ion exchange.1 Couples with vinyl and aryl triflates to form arylalkenes and biaryls.2 |

Hazard statements
- H301Toxic if swallowed
Precautionary statements
- P301IF SWALLOWED
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Transport (UN / ADR) | UN 2811 6.1 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Clarity Of Soln | passes test |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Sodium tetraphenylborate used for?
+
Sodium tetraphenylborate is primarily used as a precipitating agent for potassium and ammonium ions in analytical chemistry and as a reagent in organic synthesis for forming N-acylammonium salts and in coupling reactions.
What is the CAS number and formula for Sodium tetraphenylborate?
+
The CAS number for Sodium tetraphenylborate is 143-66-8, and its linear formula is (C₆H₅)₄BNa.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies Sodium tetraphenylborate in ACS reagent grade with an assay of ≥99.5% and a loss on drying of ≤0.5%.
How should Sodium tetraphenylborate be handled safely?
+
Sodium tetraphenylborate is classified as Danger (GHS06) and is toxic if swallowed (H301). Appropriate personal protective equipment, including a dust mask (N95), eyeshields, face shield, and gloves, must be worn. Handle in a well-ventilated area and follow precautionary statements P301 + P310.
Is Sodium tetraphenylborate a controlled substance?
+
The provided data does not indicate that Sodium tetraphenylborate is a controlled substance.
How is Sodium tetraphenylborate packed and exported?
+
Sodium tetraphenylborate is supplied according to ACS reagent specifications. For export and shipping, UN 2811 classification applies (6.1 / PGIII). Please contact us for specific packaging and shipping details for your region.
How can I request a sample or quote for Sodium tetraphenylborate?
+
To request a sample or a quote for Sodium tetraphenylborate, please use the contact form on our website or reach out to our sales team directly.
▶ Related products

Benzeneruthenium(II) chloride dimer
Ru2(C6H6)2Cl4
Catalysis & Inorganic
Benzoylferrocene
C17H14FeO
Catalysis & Inorganic
Benzyldiphenylphosphine
C6H5CH2P(C6H5)2
Catalysis & Inorganic
Beryllium
Be
Catalysis & Inorganic
Beryllium oxide
BeO
Catalysis & Inorganic![Bicyclo[2.2.1]hepta-2,5-diene-rhodium(I) chloride dimer — chemical structure, CAS 12257-42-0; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F12257-42-0.png&w=3840&q=75)
Bicyclo[2.2.1]hepta-2,5-diene-rhodium(I) chloride dimer
Catalysis & Inorganic
![Bis[(10,11-η)-5-[(11bS)-dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl- κP4]-5H-dibenz[b,f]azepine]rhodium(I) tetrafluorobo — chemical structure, CAS 1228149-03-8; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F1228149-03-8.png&w=3840&q=75)
Bis[(10,11-η)-5-[(11bS)-dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl- κP4]-5H-dibenz[b,f]azepine]rhodium(I) tetrafluorobo
1-d:1′
Catalysis & Inorganic![Bis[(2-dimethylamino)phenyl]amine nickel(II) chloride (C16H20ClN3Ni) — chemical structure, CAS 1033772-47-2; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F1033772-47-2.png&w=3840&q=75)
Bis[(2-dimethylamino)phenyl]amine nickel(II) chloride
C16H20ClN3Ni
Catalysis & Inorganic▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis