Diethyl methylphosphonate
Also known as: Diethyl methanephosphonate, O,O-Diethyl methylphosphonate, Methylphosphonic acid diethyl ester, Diethoxymethylphosphine oxide, DEMP, EINECS 211-667-4, MFCD00009813, Phosphonic acid, methyl-, diethyl ester
Diethyl methylphosphonate (CAS 683-08-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H13O3P and a molecular weight of 152.12900 g/mol. Key properties include a boiling point of 194 °C(lit.), a density of 1.041 g/mL at 25 °C(lit.) and a flash point of 75.6 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.
- CAS No.
- 683-08-9
- Jingsj CID
- J-18569-3
- Molecular Formula
- C5H13O3P
- Molecular Weight
- 152.12900 g/mol
- Category
- Organic Acids
- Last updated
- 11/2/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 194 °C(lit.) |
|---|---|
| Density | 1.041 g/mL at 25 °C(lit.) |
| Flash Point | 75.6 °C |
| Exact Mass | 152.06000 |
| PSA | 45.34000 |
| LogP | 1.88230 |
| Refractive Index | n20/D 1.414(lit.) |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2931900090 |
|---|---|
| Summary | 2931900090. other organo-inorganic compounds. VAT:17.0%. Tax rebate rate:13.0%. Supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward). MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Diethyl methylphosphonate?
The CAS number of Diethyl methylphosphonate is 683-08-9.
What are the molecular formula and molecular weight of Diethyl methylphosphonate?
Diethyl methylphosphonate has molecular formula C5H13O3P and molecular weight 152.12900 g/mol.
Is Diethyl methylphosphonate hazardous?
Diethyl methylphosphonate has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Diethyl methylphosphonate (CAS 683-08-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-18569-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.