4,4'-Bis(chlorosulfonyl)diphenyl ether

4,4'-氧双苯磺酰氯

Also known as: 4,4'-Oxybis(benzenesulfonyl chloride), 4,4'-Oxydibenzenesulfonyl chloride, bis(4-chlorosulfonylphenyl) ether, p,p'-oxybis(benzenesulfonyl chloride), phenoxybenzene-4,4'-disulfonyl chloride

4,4'-Bis(chlorosulfonyl)diphenyl ether (CAS 121-63-1) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C12H8Cl2O5S2 and a molecular weight of 367.225 g/mol. It is also known as 4,4'-Oxybis(benzenesulfonyl chloride), 4,4'-Oxydibenzenesulfonyl chloride and bis(4-chlorosulfonylphenyl) ether. Key properties include a melting point of 124-127°C, a boiling point of 471.8±30.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 239.1±24.6 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 121-63-1
Jingsj CID: J-23988-0
Molecular Formula: C₁₂H₈Cl₂O₅S₂
Chinese Name: 4,4'-氧双苯磺酰氯
Molecular Weight: 367.225 g/mol
Category: Aromatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	124-127°C
Boiling Point	471.8±30.0 °C at 760 mmHg
Density	1.6±0.1 g/cm3
Flash Point	239.1±24.6 °C

Frequently Asked Questions

What is the CAS number of 4,4'-Bis(chlorosulfonyl)diphenyl ether?

The CAS number of 4,4'-Bis(chlorosulfonyl)diphenyl ether is 121-63-1.

What are the molecular formula and molecular weight of 4,4'-Bis(chlorosulfonyl)diphenyl ether?

4,4'-Bis(chlorosulfonyl)diphenyl ether has molecular formula C12H8Cl2O5S2 and molecular weight 367.225 g/mol.

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

Last updated: 8/21/2026

How to cite: Jingsj. "4,4'-Bis(chlorosulfonyl)diphenyl ether (CAS 121-63-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-23988-0 (accessed 2026-10-23).

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