3,4-Dichloro-1,2-epoxybutane

Also known as: 1,2-Dichloro-3,4-epoxybutane, 2-(1,2-dichloroethyl)oxirane, Oxirane,2-(1,2-dichloroethyl)-, 1,2-epoxy-3,4-dichlorobutane, 3,4-Dichloro-1,2-epoxybutane, 3.4-Dichlor-1.2-epoxy-butan, DCEB

3,4-Dichloro-1,2-epoxybutane (CAS 3491-32-5) is a compound in the Ethers category listed in the Jingsj chemical database. It has the molecular formula C4H6Cl2O and a molecular weight of 140.99600 g/mol. Key properties include a boiling point of 187.7ºC at 760mmHg, a density of 1.373g/cm3 and a flash point of 127.3ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 3491-32-5
Jingsj CID: J-1510826-3
Molecular Formula: C₄H₆Cl₂O
Molecular Weight: 140.99600 g/mol
Category: Ethers
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	187.7ºC at 760mmHg
Density	1.373g/cm3
Flash Point	127.3ºC
Exact Mass	139.98000
PSA	12.53000
LogP	1.23140
Refractive Index	1.491

Customs & Trade Information

HS Code	2910900090
Summary	2910900090. epoxides, epoxyalcohols, epoxyphenols and epoxyethers, with a three-membered ring, and their halogenated, sulphonated, nitrated or nitrosated derivatives. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:5.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 3,4-Dichloro-1,2-epoxybutane?

The CAS number of 3,4-Dichloro-1,2-epoxybutane is 3491-32-5.

What are the molecular formula and molecular weight of 3,4-Dichloro-1,2-epoxybutane?

3,4-Dichloro-1,2-epoxybutane has molecular formula C4H6Cl2O and molecular weight 140.99600 g/mol.

What are the upstream and downstream products of 3,4-Dichloro-1,2-epoxybutane?

For 3,4-Dichloro-1,2-epoxybutane, Upstream Products: 2-Vinyloxirane, propylene glycol; Downstream Products: Oxirane, 2-(1-chloroethenyl)-.

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

Last updated: 8/21/2026

How to cite: Jingsj. "3,4-Dichloro-1,2-epoxybutane (CAS 3491-32-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1510826-3 (accessed 2026-11-06).

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