Triphenylphosphine oxide
Also known as: TPPO, Ph3P=O, Ph3PO, triphenylphosphane oxide, triphenylphosphine oxide (TPPO), phosphorane, triphenyl-, oxide, triphenylphosphoniumolate, triphenylphosphanoxid, AURORA KA-1603, MFCD00002080
Triphenylphosphine oxide (CAS 791-28-6) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C18H15OP and a molecular weight of 278.285 g/mol. Key properties include a melting point of 150-157 °C(lit.), a boiling point of 462.9±18.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 233.8±21.2 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 791-28-6
- Jingsj CID
- J-20137-3
- Molecular Formula
- C18H15OP
- Molecular Weight
- 278.285 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 150-157 °C(lit.) |
|---|---|
| Boiling Point | 462.9±18.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 233.8±21.2 °C |
| Exact Mass | 278.086060 |
| PSA | 26.88000 |
| LogP | 2.87 |
| Vapor Pressure | 0.0±1.1 mmHg at 25°C |
| Refractive Index | 1.619 |
| Additional Property | slightly soluble |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
- H412 — Harmful to aquatic life with long lasting effects
Customs & Trade Information
| HS Code | 29310095 |
|---|
Frequently Asked Questions
What is the CAS number of Triphenylphosphine oxide?
The CAS number of Triphenylphosphine oxide is 791-28-6.
What are the molecular formula and molecular weight of Triphenylphosphine oxide?
Triphenylphosphine oxide has molecular formula C18H15OP and molecular weight 278.285 g/mol.
Is Triphenylphosphine oxide hazardous?
Triphenylphosphine oxide has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of Triphenylphosphine oxide?
For Triphenylphosphine oxide, Upstream Products: Dichlorotriphenylphosphorane, Bromobenzene, Diphenylphosphine oxide; Downstream Products: Diphenylphosphine oxide, Triphenylphosphine, Diphenylphosphine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Triphenylphosphine oxide (CAS 791-28-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-20137-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.