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3,5-Dichlorobenzenesulfonyl chloride

3,5-二氯苯磺酰氯

Also known as: 3,5-Dichlorobenzene-1-sulfonyl chloride, 3,5-Dichlorobenzenesulphonyl chloride, Benzenesulfonyl chloride, 3,5-dichloro-, MFCD00051698, WSGR CG EG, BUTTPARK 95\57-48

3,5-Dichlorobenzenesulfonyl chloride (CAS 705-21-5) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C6H3Cl3O2S and a molecular weight of 245.511 g/mol. It is also known as 3,5-Dichlorobenzene-1-sulfonyl chloride, 3,5-Dichlorobenzenesulphonyl chloride and Benzenesulfonyl chloride, 3,5-dichloro-. Key properties include a melting point of 32-35 °C(lit.), a boiling point of 334.4±32.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 156.0±25.1 °C. GHS signal word: Danger. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
705-21-5
Jingsj CID
J-8621-7
Molecular Formula
C6H3Cl3O2S
Chinese Name
3,5-二氯苯磺酰氯
Molecular Weight
245.511 g/mol
Category
Aromatic Hydrocarbons
Last updated
8/21/2026

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Physicochemical Properties

Melting Point32-35 °C(lit.)
Boiling Point334.4±32.0 °C at 760 mmHg
Density1.6±0.1 g/cm3
Flash Point156.0±25.1 °C

GHS Safety & Compliance

CorrosionSignal word: Danger

Frequently Asked Questions

What is the CAS number of 3,5-Dichlorobenzenesulfonyl chloride?

The CAS number of 3,5-Dichlorobenzenesulfonyl chloride is 705-21-5.

What are the molecular formula and molecular weight of 3,5-Dichlorobenzenesulfonyl chloride?

3,5-Dichlorobenzenesulfonyl chloride has molecular formula C6H3Cl3O2S and molecular weight 245.511 g/mol.

Is 3,5-Dichlorobenzenesulfonyl chloride hazardous?

3,5-Dichlorobenzenesulfonyl chloride 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. "3,5-Dichlorobenzenesulfonyl chloride (CAS 705-21-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-8621-7 (accessed 2026-10-22).

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