Diethyl ethylphosphonate
Diethyl ethylphosphonate (CAS: 78-38-6; Formula: C6H15O3P) is an organic phosphate compound with a molecular weight of 166.16 g/mol. This chemical serves as a nonflammable organic phosphate electrolyte in dye-sensitized solar cells and acts as a catalyst in the preparation of syndiotactic 1,2-polybutadiene. It is also utilized as an additive in polymer systems for flame retardancy studies and applications.
- IUPAC
- Diethoxyethylphosphine oxide,NSC 2671
- Synonyms
- Diethoxyethylphosphine oxide

Dye-Sensitized Solar Cells
Used as an efficient and nonflammable organic phosphate electrolyte, contributing to the performance of dye-sensitized solar cells.
Polybutadiene Synthesis
Functions as a catalyst in the preparation of syndiotactic 1,2-polybutadiene, a specific polymer structure.
Flame Retardancy Studies
Employed as an additive in cone calorimetry studies to investigate the flame-retardant properties of polymer systems incorporating chemically bonded phosphorus.
Flame Retardant Additive
Incorporated into materials as a flame retardant, enhancing fire safety characteristics of various polymer systems.
| Molecular weight | 166.16 |
|---|---|
| Empirical formula | C6H15O3P |
| Assay | ≥98.0% (GC) |
| Density | 1.024 g/mL at 20 °C(lit.) |
| Refractive index | n20/D 1.417 |
| Application | Used as an efficient and nonflammable organic phosphate electrolyte for dye-sensitized solar cells1Catalyst for preparation of syndiotactic 1,2-polybutadiene2Additive for • Cone calorimetry study of polymer systems flame retarded by chemically bonded phosphorus3• Flame retardants4,5,6 |



Hazard statements
- H302Harmful if swallowed
- H318Causes serious eye damage
- H411Toxic to aquatic life with long-lasting effects
Precautionary statements
- P273Avoid release to the environment
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Flash point | >200 °C / >392 °F |
|---|---|
| Transport (UN / ADR) | UN 3082 9 / PGIII |
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | Xn,N |
| Risk statements (R) | 22-41-51/53 |
| Safety statements (S) | 26-39-61 |
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 Diethyl ethylphosphonate used for?
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Diethyl ethylphosphonate (CAS: 78-38-6) is used as an electrolyte in dye-sensitized solar cells, a catalyst for polybutadiene synthesis, and as an additive for flame retardancy studies and applications in polymer systems.
What are the CAS number and formula for Diethyl ethylphosphonate?
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The CAS number for Diethyl ethylphosphonate is 78-38-6, and its empirical formula is C6H15O3P.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Diethyl ethylphosphonate with a purity of ≥98.0% (GC). TSS does not represent this product as USP, BP, or EP grade.
How should Diethyl ethylphosphonate be handled safely?
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Diethyl ethylphosphonate is harmful if swallowed, causes serious eye damage, and is toxic to aquatic life with long lasting effects. Handle with appropriate personal protective equipment, ensuring adequate ventilation and avoiding release to the environment. Refer to the safety data sheet for detailed handling instructions.
Is Diethyl ethylphosphonate shipped internationally?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including Diethyl ethylphosphonate.
How can I request a sample or quote for Diethyl ethylphosphonate?
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To request a sample or quote for Diethyl ethylphosphonate, please contact our sales team through the website or via direct inquiry, providing your specific requirements.
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