Description and features
Catonium ETPB (Ethyltriphenylphosphonium Bromide / CAS: 1530-32-1) is a white to off-white crystalline powder with the chemical formula C20H20BrP. Commonly known as ETPB, this quaternary phosphonium salt finds wide application in organic synthesis and chemical research. Its distinctive molecular structure, featuring an ethyl group attached to a triphenylphosphonium cation and a bromide anion, makes it a versatile reagent in various reactions, including Wittig olefination, phase-transfer catalysis, and as a precursor in organometallic chemistry.
ETPB facilitates efficient and selective transformations, making it a valuable tool for chemists in both academia and industry. Its versatility and ease of use drive its widespread adoption in synthesizing 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 in stock in our local warehouses. Our lead time is about one week if delivered in 20 KG drums.
We can also serve Canada, South America, South Africa, and other markets. 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 acts as a phase transfer catalyst, accelerating the cure of phenolic-based epoxy resins, certain fluoroelastomer resins, and thermosetting powder coatings. CatOnium ETPB also serves as a catalyst in synthesizing specific organic compounds.
Compared to amines, imidazoles, and quaternary ammonium salts, CatOnium ETPB offers significantly better latency and thermal stability. Additionally, it provides 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 outlines the hazards of a product and explains how to handle, use, and store the product safely. Besides it provides important regulatory and emergency response information for the purchased product.
A Material Safety Data Sheet (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) |