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Description and features

Catonium BTPC (Butyltriphenylphosphonium Chloride) is a white to greyish powder, its chemical formula is C22H24ClP. BTPC is a quaternary phosphonium salt which is used in organic synthesis as a wittig reagent and as a phase transfer catalyst. This material is highly soluble in water and polarizable solvents.

Butyltriphnylphosphonium Chloride is also known as BTPC, BTPPC, BuTPPC and TPBP-Cl.

Compared to amines, imidazoles and quaternary ammonium salts CatOnium BTPC features considerable better latency and thermal stability. Further it offers a low odor, minimal color formation and controlled reactivity.


United States: CatOnium BTPC is ➔ on stock in our local warehouses. Our lead time is about one week if delivered in 20 KG fiber drums.

Europe, Canada,  South America,  South Africa and other markets can also be served, please contact our sales department for more details.

➔ Limited available in the European Union as this product has not been REACH registered (yet).

Product Identification

CAS number13371-17-0
EC number236-443-3
HS code2931 39 90


AppearanceWhite to greyish powder
Assay≥ 98.00 %
Water content≤ 1.00 %


CatOnium BTPC (Butyltriphenylphosphonium Chloride) is being on organic synthesis as a wittig reagent and as phase transfer catalyst, used to accelerate the cure of phenolic based epoxy reins, certain fluoroelastomers and thermosetting powder coatings.


Available packaging: 20 KG fiber drums.
Special packaging is available on request.


Store Butyltriphenylphosphonium Chloride in a cool, dry and well-ventilated area and in line with  legal requirements.

Keep BTPC away from heat sources and oxidizing agents


A Material Safety Data Sheets (MSDS) is available for CatOnium BTPC and all other products supplied by Vesta Chemicals BV.

An MSDS describes the hazards of a product and explains how a product can be safely handled, used and stored. Besides it provides important regulatory and emergency response information for the purchased product.

Molecular and structural information

Molecular formulaC22H24ClP
Molecular weight354.85 g/mol
Smiles notation [Cl-].CCCC[P+](c1ccccc1)(c1ccccc1)c1ccccc1
Chemical formula butyltriphenylphosphonium chloride

Physicochemical information

Boiling pointNo data available
Relative density @ 20 ºC No data available
Flash point>270 ºC
Melting point223 – 227 ºC
Partition coefficient (log Pow)1.7864
Solubility in waterSoluble
Vapor pressure (MGM)No data available

Butyltriphenylphosphonium Chloride | CAS: 13371-17-0 | Disclaimer. This information is supplied solely for informational purposes and Vesta Chemicals bv makes no guarantees or warranties, either expressed or implied, with respect to the accuracy and use of this data. All product warranties and guarantees shall be governed by the Standard Terms of Sale. Nothing in this document is legal advice or is a substitute for competent legal advice.