Cesium fluoride
Cesium fluoride (CAS: 13400-13-0), with the chemical formula CsF and a molecular weight of 151.90 g/mol, is a highly soluble inorganic salt. It is a potent fluoride source and a strong base, finding utility in various synthetic organic chemistry applications, particularly in catalytic processes. TSS supplies this compound with a high purity assay of 99.9% trace metals basis.
- IUPAC
- NSC 84270

Suzuki Carbonylative Coupling
Cesium fluoride serves as a crucial base in the Suzuki carbonylative coupling reaction. It facilitates the coupling of enol triflates with vinyl boronic acids, enabling the synthesis of complex organic molecules.
Organic Synthesis Reagent
As a strong fluoride source and base, CsF is employed in various organic transformations. Its properties make it valuable for deprotection reactions and as a catalyst or co-catalyst in specific synthetic pathways.
Fluoride Source
This inorganic salt is an effective source of fluoride ions, essential for reactions requiring nucleophilic fluorination or the introduction of fluorine into organic structures.
| Molecular weight | 151.90 |
|---|---|
| Empirical formula | CsF |
| Assay | 99.9% trace metals basis |
| Form | solid |
| Density | 4.115 g/mL at 25 °C(lit.) |
| Solubility | H2O: soluble3 M at 20 °C, clear, colorless |
| pH | 6.5-7.5 (25 °C, 3 M in H2O) |
| Melting point | 682 °C(lit.) |
| Loss on drying | ≤0.5% loss on drying, 110 °C |
| Impurities tested | insoluble matter, passes filter test≤0.005% total nitrogen (N) |
| Application | Used as a base in the Suzuki carbonylative coupling of enol triflates with vinyl boronic acids.5 |


Hazard statements
- H301Toxic if swallowed
- H314Causes severe skin burns and eye damage
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P301IF SWALLOWED
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 2923 8/PG 2 |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T |
| Risk statements (R) | 23/24/25-34 |
| Safety statements (S) | 26-36/37/39-45 |
| Anion traces | chloride (Cl-): ≤500 mg/kgsulfate (SO42-): ≤50 mg/kg |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Uv Absorption | λ: 260 nm Amax: 0.05λ: 280 nm Amax: 0.05 |
|---|
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 Cesium Fluoride used for?
+
Cesium Fluoride (CsF) is primarily used as a base in organic synthesis, notably in Suzuki carbonylative coupling reactions. It is also utilised as a potent fluoride source for various chemical transformations.
What is the CAS number and chemical formula for Cesium Fluoride?
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The CAS number for Cesium Fluoride is 13400-13-0, and its chemical formula is CsF.
What grade and purity does Tech Serve Solutions supply for Cesium Fluoride?
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Tech Serve Solutions supplies Cesium Fluoride with an assay of 99.9% trace metals basis. TSS does not represent this product as USP, BP, or EP grade.
How should Cesium Fluoride be handled safely?
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Cesium Fluoride is a Danger hazard, causing severe skin burns and eye damage (H314) and is toxic if swallowed, in contact with skin, or if inhaled (H301 + H311 + H331). Appropriate personal protective equipment, including eyeshields, gloves, and respiratory protection, is essential. Handle in a well-ventilated area and avoid contact with skin, eyes, and clothing.
How is Cesium Fluoride packed and shipped?
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Cesium Fluoride is packed in accordance with international shipping regulations for hazardous materials. It is classified under UN 2923, 8/PG 2, for transport.
How can I request a quote or sample for Cesium Fluoride?
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To request a quote or sample for Cesium Fluoride, please contact the Tech Serve Solutions sales team via our website or direct enquiry channels.
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