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Diphenyl phosphite

Also known as: Diphenyl hydrogen phosphite, Diphenoxyphosphine oxide, Diphenyl phosphonate, Phosphonic acid diphenyl ester, Phosphorous acid diphenyl ester, Diphenyl H-phosphonate, Diphenylphosphite, Weston DPP, Doverphos DPP, EINECS 225-202-8, MFCD00044497

Diphenyl phosphite (CAS 4712-55-4) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C12H11O3P and a molecular weight of 234.18800 g/mol. Key properties include a melting point of 12 °C(lit.), a boiling point of 218-219 °C26 mm Hg(lit.), a density of 1.223 g/mL at 25 °C(lit.) and a flash point of 176.7 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H318 — Causes serious eye damage. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.

CAS No.
4712-55-4
Jingsj CID
J-15114-4
Molecular Formula
C12H11O3P
Molecular Weight
234.18800 g/mol
Category
Organic Acids
Last updated
11/2/2026
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Physicochemical Properties

Melting Point12 °C(lit.)
Boiling Point218-219 °C26 mm Hg(lit.)
Density1.223 g/mL at 25 °C(lit.)
Flash Point176.7 °C
Exact Mass234.04500
PSA59.00000
LogP3.53410
Additional Property8.1 (vs air)
Vapor Pressure5 mm Hg ( 140 °C)
Refractive Indexn20/D 1.558(lit.)

GHS Safety & Compliance

Corrosion / IrritantSignal word: Danger
  • H302 — Harmful if swallowed
  • H315 — Causes skin irritation
  • H318 — Causes serious eye damage
  • H335 — May cause respiratory irritation

Frequently Asked Questions

What is the CAS number of Diphenyl phosphite?

The CAS number of Diphenyl phosphite is 4712-55-4.

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

Diphenyl phosphite has molecular formula C12H11O3P and molecular weight 234.18800 g/mol.

Is Diphenyl phosphite hazardous?

Diphenyl phosphite has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H318 — Causes serious eye damage.

What are the upstream and downstream products of Diphenyl phosphite?

For Diphenyl phosphite, Upstream Products: Phenol, Triphenyl phosphite, Diethyl phosphate; Downstream Products: Diphenyl (N-Methoxy-N-methylcarbamoylmethyl)phosphonate, Triphenyl phosphite, Dioctadecyl phosphite.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Diphenyl phosphite (CAS 4712-55-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-15114-4 (accessed 2026-11-09).

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