Trioctylphosphine oxide
Also known as: Trioctylphosphane oxide, Tri-n-octylphosphine oxide, Tri-n-octylphosphinoxide, TOPO, CYANEX 921, HISHICOLIN PO-8, 1-dioctylphosphoryloctane, Phosphine oxide, trioctyl-, Phosphorane, trioctyl-, oxide
Trioctylphosphine oxide (CAS 78-50-2) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C24H51OP and a molecular weight of 386.635 g/mol. Key properties include a melting point of 50-52 °C(lit.), a boiling point of 408.8±0.0 °C at 760 mmHg, a density of 0.9±0.1 g/cm3 and a flash point of 259.8±21.5 °C. It is classified under GHS with signal word Danger and hazard statements H315 — Causes skin irritation and H318 — Causes serious eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 78-50-2
- Jingsj CID
- J-1991787-4
- Molecular Formula
- C24H51OP
- Molecular Weight
- 386.635 g/mol
- Category
- Organic Compounds
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 50-52 °C(lit.) |
|---|---|
| Boiling Point | 408.8±0.0 °C at 760 mmHg |
| Density | 0.9±0.1 g/cm3 |
| Flash Point | 259.8±21.5 °C |
| Exact Mass | 386.367737 |
| PSA | 26.88000 |
| LogP | 9.40 |
| Vapor Pressure | 0.0±0.9 mmHg at 25°C |
| Refractive Index | 1.448 |
| Additional Property | Insoluble |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H318 — Causes serious eye damage
Customs & Trade Information
| HS Code | 32019090 |
|---|
Frequently Asked Questions
What is the CAS number of Trioctylphosphine oxide?
The CAS number of Trioctylphosphine oxide is 78-50-2.
What are the molecular formula and molecular weight of Trioctylphosphine oxide?
Trioctylphosphine oxide has molecular formula C24H51OP and molecular weight 386.635 g/mol.
Is Trioctylphosphine oxide hazardous?
Trioctylphosphine oxide has GHS signal word Danger and hazard statements H315 — Causes skin irritation; H318 — Causes serious eye damage.
What are the upstream and downstream products of Trioctylphosphine oxide?
For Trioctylphosphine oxide, Upstream Products: Trioctylphosphine, 1-Chlorooctane, 1-Bromooctane; Downstream Products: Perfluorooctane, Trioctylphosphine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Trioctylphosphine oxide (CAS 78-50-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1991787-4 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.