Diethyl (trichloromethyl)phosphonate
Also known as: Diethyl trichloromethylphosphonate, Diethyl trichloromethanephosphonate, Trichloromethylphosphonic acid diethyl ester, Phosphonic acid, (trichloromethyl)-, diethyl ester, 1-[Ethoxy(trichloromethyl)phosphoryl]oxyethane, Ro 3-0658, NSC 46567, TIMTEC-BB SBB008195
Diethyl (trichloromethyl)phosphonate (CAS 866-23-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H10Cl3O3P and a molecular weight of 255.46400 g/mol. Key properties include a boiling point of 126ºC (0.3 torr), a density of 1.362 g/mL at 25ºC(lit.) and a flash point of >110.0 °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 3, 2026.
- CAS No.
- 866-23-9
- Jingsj CID
- J-1175932-3
- Molecular Formula
- C5H10Cl3O3P
- Molecular Weight
- 255.46400 g/mol
- Category
- Organic Acids
- Last updated
- 11/3/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 126ºC (0.3 torr) |
|---|---|
| Density | 1.362 g/mL at 25ºC(lit.) |
| Flash Point | >110.0 °C |
| Exact Mass | 253.94300 |
| PSA | 45.34000 |
| LogP | 3.58020 |
| Appearance | Liquid |
| Refractive Index | n20/D 1.463(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 (trichloromethyl)phosphonate?
The CAS number of Diethyl (trichloromethyl)phosphonate is 866-23-9.
What are the molecular formula and molecular weight of Diethyl (trichloromethyl)phosphonate?
Diethyl (trichloromethyl)phosphonate has molecular formula C5H10Cl3O3P and molecular weight 255.46400 g/mol.
Is Diethyl (trichloromethyl)phosphonate hazardous?
Diethyl (trichloromethyl)phosphonate 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 (trichloromethyl)phosphonate (CAS 866-23-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1175932-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.