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Diethyl phosphite

Also known as: Diethyl phosphonate, Phosphonic acid diethyl ester, Diethyl hydrogen phosphite, Diethoxyphosphine oxide, Ethyl phosphonate ((EtO)2HPO)

Diethyl phosphite (CAS 762-04-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C4H10O3P and a molecular weight of 138.10200 g/mol. Key properties include a melting point of -70 °C, a boiling point of 50-51 °C2 mm Hg(lit.), a density of 1.072 g/mL at 25 °C(lit.) and a flash point of 82.2 °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.
762-04-9
Jingsj CID
J-3247-3
Molecular Formula
C4H10O3P
Molecular Weight
138.10200 g/mol
Category
Organic Acids
Last updated
11/2/2026
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Physicochemical Properties

Melting Point-70 °C
Boiling Point50-51 °C2 mm Hg(lit.)
Density1.072 g/mL at 25 °C(lit.)
Flash Point82.2 °C
Exact Mass138.04500
PSA59.00000
LogP1.44910
Refractive Indexn20/D 1.407(lit.)
Additional Propertymiscible (hydrolysis)

GHS Safety & Compliance

IrritantSignal word: Warning
  • H315 — Causes skin irritation
  • H319 — Causes serious eye irritation
  • H335 — May cause respiratory irritation

Frequently Asked Questions

What is the CAS number of Diethyl phosphite?

The CAS number of Diethyl phosphite is 762-04-9.

What are the molecular formula and molecular weight of Diethyl phosphite?

Diethyl phosphite has molecular formula C4H10O3P and molecular weight 138.10200 g/mol.

Is Diethyl phosphite hazardous?

Diethyl phosphite has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of Diethyl phosphite?

For Diethyl phosphite, Upstream Products: Triethyl phosphite, Ethanol, Diethyl (2-bromoethyl)phosphonate.

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 phosphite (CAS 762-04-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-3247-3 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.