Dimethyl vinylphosphonate
Dimethyl vinylphosphonate (CAS 4645-32-3) is a clear, colourless liquid with the linear formula CH₂=CHPO(OCH₃)₂ and a molecular weight of 136.09 g/mol. This organophosphorus compound serves as a valuable building block in organic synthesis. Its reactivity makes it useful in creating specialised polymers and as an intermediate for more complex molecules in research and development settings.

Organic Synthesis Intermediate
Dimethyl vinylphosphonate is employed as a versatile intermediate in the synthesis of various organic compounds. Its phosphonate group and vinyl functionality allow for diverse chemical transformations.
Monomer for Polymerisation
The vinyl group enables this compound to act as a monomer in polymerisation reactions. It can be incorporated into polymers to introduce phosphonate functionality, modifying material properties.
Reagent in Phosphorus Chemistry
It serves as a useful reagent for introducing the phosphonate ester moiety into other molecules. This is particularly relevant in the development of flame retardants or functional materials.
| Molecular weight | 136.09 |
|---|---|
| Linear formula | CH2=CHPO(OCH3)2 |
| Assay | ≥95% (GC) |
| Boiling point | 197-202 °C(lit.) |
| Density | 1.146 g/mL at 20 °C(lit.) |
| Refractive index | n20/D 1.428 |
| Storage temperature | 2-8°C |

Hazard statements
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 98 °C / 208.4 °F |
| Transport (UN / ADR) | UN 3265 8 / PGIII |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | C |
| Risk statements (R) | 34 |
| Safety statements (S) | 26-36/37/39-45 |
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 Dimethyl vinylphosphonate used for?
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Dimethyl vinylphosphonate is primarily used as a building block and intermediate in organic synthesis, including the preparation of specialised polymers and phosphorus-containing compounds.
What is the CAS number and formula for Dimethyl vinylphosphonate?
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The CAS number is 4645-32-3, and its linear formula is CH₂=CHPO(OCH₃)₂.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Dimethyl vinylphosphonate with an assay of ≥95% (GC). This product is not represented as USP, BP, EP, or other pharmacopoeia grades.
How should Dimethyl vinylphosphonate be handled safely?
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Dimethyl vinylphosphonate is classified as corrosive (H314) and causes severe skin burns and eye damage. Appropriate personal protective equipment, including gloves, goggles, and face shields, must be worn. Handle in a well-ventilated area or use a suitable respirator.
How is Dimethyl vinylphosphonate packed and shipped?
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Dimethyl vinylphosphonate is shipped as UN 3265, Class 8, Packing Group III. Specific packaging details are available upon request, and TSS is an experienced global exporter.
How can I request a sample or quote?
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To request a sample or quote for Dimethyl vinylphosphonate, please contact the TSS sales team through our website or by phone.
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