Hexamethylphosphoramide
Also known as: Hexamethylphosphoric triamide, Tris(dimethylamino)phosphine oxide, HMPA, HMPTA, Hexametapol, Eastman Inhibitor HPT, ENT 50,882, ENT 50882, Phosphoric acid hexamethyltriamide, N,N,N',N',N'',N''-hexamethylphosphoric triamide, HPT, MFCD00008303, EINECS 211-653-8, HEMPA
Hexamethylphosphoramide (CAS 680-31-9) is a compound in the Organic Bases category listed in the Jingsj chemical database. It has the molecular formula C6H18N3OP and a molecular weight of 179.20000 g/mol. Key properties include a melting point of 7 °C(lit.), a boiling point of 230-232 °C740 mm Hg(lit.), a density of 1.03 g/mL at 25 °C(lit.) and a flash point of 105.6 °C. It is classified under GHS with signal word Danger and hazard statements H340 and H350 — May cause cancer. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.
- CAS No.
- 680-31-9
- Jingsj CID
- J-33403-3
- Molecular Formula
- C6H18N3OP
- Molecular Weight
- 179.20000 g/mol
- Category
- Organic Bases
- Last updated
- 11/2/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 7 °C(lit.) |
|---|---|
| Boiling Point | 230-232 °C740 mm Hg(lit.) |
| Density | 1.03 g/mL at 25 °C(lit.) |
| Flash Point | 105.6 °C |
| Exact Mass | 179.11900 |
| PSA | 36.60000 |
| LogP | 0.77930 |
| Additional Property | 6.18 (vs air) |
| Vapor Pressure | 0.07 mm Hg ( 25 °C) |
| Refractive Index | n20/D 1.459(lit.) |
| Additional Property | Miscible |
| Additional Property | 7℃ |
GHS Safety & Compliance
- H340
- H350 — May cause cancer
Frequently Asked Questions
What is the CAS number of Hexamethylphosphoramide?
The CAS number of Hexamethylphosphoramide is 680-31-9.
What are the molecular formula and molecular weight of Hexamethylphosphoramide?
Hexamethylphosphoramide has molecular formula C6H18N3OP and molecular weight 179.20000 g/mol.
Is Hexamethylphosphoramide hazardous?
Hexamethylphosphoramide has GHS signal word Danger and hazard statements H340; H350 — May cause cancer.
What are the upstream and downstream products of Hexamethylphosphoramide?
For Hexamethylphosphoramide, Upstream Products: Tris(dimethylamino)phosphine, Bis(dimethylamino)phosphoryl chloride, Triphenylphosphine; Downstream Products: Methyl 4,4-dimethyl-3-oxopentanoate, Imino-tris(dimethylamino)phosphorane, 2-Methylpyridine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Hexamethylphosphoramide (CAS 680-31-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-33403-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.