Tetraphenylphosphonium bromide
Tetraphenylphosphonium bromide (CAS 2751-90-8) is a chemical compound with the molecular formula (C6H5)4P(Br) and a molecular weight of 419.29 g/mol. It is a quaternary phosphonium salt recognised for its utility as a phase transfer catalyst and a reagent in organic synthesis. This compound facilitates reactions between immiscible phases, improving yields and reaction rates in various chemical transformations.

Phase Transfer Catalysis
Tetraphenylphosphonium bromide acts as an effective phase transfer catalyst, enabling reactions between reactants in different phases (e.g., aqueous and organic). It helps to transfer anions from an aqueous phase to an organic phase, thereby accelerating reaction rates.
Chemical Synthesis Reagent
This phosphonium salt serves as a versatile reagent in various organic synthesis protocols. Its structure allows for participation in diverse chemical reactions, contributing to the construction of complex organic molecules.
Electrochemical Applications
In electrochemistry, tetraphenylphosphonium bromide can be employed as a supporting electrolyte or as a component in electrode modification. Its ionic nature and stability make it suitable for certain electrochemical studies and applications.
| Molecular weight | 419.29 |
|---|---|
| Linear formula | (C6H5)4P(Br) |
| Assay | 97% |
| Grade | Vetec™ reagent grade |
| Melting point | 295-300 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Water hazard class (WGK, DE) | 3 |
|---|---|
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
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 Tetraphenylphosphonium bromide used for?
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Tetraphenylphosphonium bromide is primarily used as a phase transfer catalyst and a reagent in chemical synthesis. It also finds applications in electrochemistry.
What is the CAS number and formula for Tetraphenylphosphonium bromide?
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The CAS number for Tetraphenylphosphonium bromide is 2751-90-8. Its linear formula is (C6H5)4P(Br).
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Tetraphenylphosphonium bromide in reagent grade with an assay of 97%.
How should Tetraphenylphosphonium bromide be handled?
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Tetraphenylphosphonium bromide is an irritant to the skin, eyes, and respiratory tract. Handle with appropriate personal protective equipment, including gloves, eye protection, and ensure adequate ventilation. Avoid inhalation of dust. Refer to the Safety Data Sheet for detailed handling instructions.
Is Tetraphenylphosphonium bromide a controlled substance?
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Based on the provided data, Tetraphenylphosphonium bromide is not indicated as a controlled substance.
How is Tetraphenylphosphonium bromide packed and shipped?
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Tetraphenylphosphonium bromide is carefully packed to ensure safe transit and is exported globally by Tech Serve Solutions.
How can I request a sample or quote for Tetraphenylphosphonium bromide?
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To request a sample or a quote for Tetraphenylphosphonium bromide, please contact our sales team through the website or by phone.
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