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4,4'-Oxybis(phenyl isocyanate)

氧化双(4-苯基异氰酸酯)

Also known as: 4,4'-Diisocyanatodiphenyl ether, 4,4'-Diisocyanatodiphenyl oxide, 1-isocyanato-4-(4-isocyanatophenoxy)benzene, 4,4'-Oxybis(isocyanatobenzene), Oxybis(1,4-phenylene)diisocyanate, Oxybis(1,4-phenylene)bisisocyanate, 4,4'-Diisocyanato[1,1'-oxybisbenzene]

4,4'-Oxybis(phenyl isocyanate) (CAS 4128-73-8) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C14H8N2O3 and a molecular weight of 252.22500 g/mol. It is also known as 4,4'-Diisocyanatodiphenyl ether, 4,4'-Diisocyanatodiphenyl oxide and 1-isocyanato-4-(4-isocyanatophenoxy)benzene. Key properties include a melting point of 64-68ºC(lit.), a boiling point of 196ºC5 mm Hg(lit.) and a density of 1.2700 (rough estimate). GHS signal word: Danger. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
4128-73-8
Jingsj CID
J-1166-4
Molecular Formula
C14H8N2O3
Chinese Name
氧化双(4-苯基异氰酸酯)
Molecular Weight
252.22500 g/mol
Category
Organic Acids
Last updated
8/21/2026

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Physicochemical Properties

Melting Point64-68ºC(lit.)
Boiling Point196ºC5 mm Hg(lit.)
Density1.2700 (rough estimate)

GHS Safety & Compliance

Acute Toxicity / Health HazardSignal word: Danger

Frequently Asked Questions

What is the CAS number of 4,4'-Oxybis(phenyl isocyanate)?

The CAS number of 4,4'-Oxybis(phenyl isocyanate) is 4128-73-8.

What are the molecular formula and molecular weight of 4,4'-Oxybis(phenyl isocyanate)?

4,4'-Oxybis(phenyl isocyanate) has molecular formula C14H8N2O3 and molecular weight 252.22500 g/mol.

Is 4,4'-Oxybis(phenyl isocyanate) hazardous?

4,4'-Oxybis(phenyl isocyanate) has GHS signal word Danger.

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

Last updated:

How to cite: Jingsj. "4,4'-Oxybis(phenyl isocyanate) (CAS 4128-73-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1166-4 (accessed 2026-10-23).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.