Description and features
Catonium ETPB (Ethyltriphenylphosphonium Bromide / CAS: 1530-32-1) is a white to off-white crystalline powder. Its chemical formula is C20H20BrP and it is commonly known as ETPB, is a quaternary phosphonium salt with a wide range of applications in organic synthesis and chemical research. With its distinctive molecular structure comprising an ethyl group attached to a triphenylphosphonium cation and a bromide anion, ETPB serves as a versatile reagent in various reactions, including Wittig olefination, phase-transfer catalysis, and as a precursor in organometallic chemistry.
Its ability to facilitate efficient and selective transformations makes it a valuable tool for chemists in both academia and industry. ETPB’s versatility and ease of use contribute to its widespread adoption in the synthesis of pharmaceuticals, agrochemicals, and advanced materials.
Synonyms
Ethyltriphenylphosphonium Bromide is also known as BETP, ETPB, ETPPB, ETPPBr, TEP and TREP.
Availability
Europe / United States: CatOnium ETPB is ➔ on stock in our local warehouses. Our lead time is about one week if delivered in 20 KG drums.
Canada, South America, South Africa and other markets can also be served, please contact our sales department for more details.
This substance (CAS: 1779-51-7) has been registered under REACH (EC) 1907/2006.
Product Identification
| CAS number | 1530-32-1 |
| EC number | 216-223-3 |
| HS code | 2931 39 90 |
| Sensitivity | Hygroscopic |
Specification
| Appearance | White to off white powder |
| Assay | ≥ 98.00 % |
| Melting Point | 203 – 209 °C |
| Water content | ≤0.50 % |
| Loss on drying | ≤0.50 % |
Application
ETPB is a phase transfer catalyst, used to accelerate the cure of phenolic-based epoxy resins, certain fluoroelastomer resins and thermosetting powder coatings. CatOnium ETPB is also used as catalysts in the synthesis of certain organic compounds.
Compared to amines, imidazoles and quaternary ammonium salts CatOnium ETPB features considerable better latency and thermal stability. Further it offers a low odor, minimal color formation and controlled reactivity.
Packaging
Available packaging: 20 KG fiber drums & 500 KG big bags.
Special packaging is available on request.
Storage
Store ethyltriphenylphosphonium bromide in a cool, dry and well-ventilated area and in line with legal requirements.
Keep ETPB away from heat sources and oxidizing agents
MSDS
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.
A Material Safety Data Sheets (MSDS) is available for CatOnium ETPB and all other products supplied by Vesta Chemicals BV.
Molecular and structural information
| Molecular formula | C20H20BrP |
| Molecular weight | 371.25 g/mol |
| Smiles notation | CC[P+](C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.Br |
| InChi Key | JHYNXXDQQHTCHJ-UHFFFAOYSA-M |
| Chemical formula |  |
Physicochemical information
| Boiling point | 355 ºC @ 960 hPa |
| Bulk density | 766 kg/m3 |
| Flash point | >205 ºC @ 1013 hPa |
| Melting point | 202.50 ºC at 101.3 kPa |
| Partition coefficient (log Pow) | -0.698 @ 35 ºC (pH 4.65) |
| Solubility in water | 42.9 g/l (25 ºC) |
| Vapor pressure (MGM) | 0.000158 Pa (25 ºC) |