3-Methyl-1,2-oxathiolane 2,2-dioxide

Also known as: 2,4-Butanesultone, 4-Hydroxy-2-butanesulfonic acid gamma-sultone, 1,2-oxathiolane, 3-methyl-, 2,2-dioxide, 1-Methyl-1,3-propanesultone, 3-Methyl-1,2-oxathiolane 2,2-Dioxide, 4-Hydroxy-2-butanesulfonic acid γ-sultone, (R,S)-3-Methyl-[1,2]oxathiolane 2,2-dioxide

3-Methyl-1,2-oxathiolane 2,2-dioxide (CAS 1121-03-5) is a compound in the Esters category listed in the Jingsj chemical database. It has the molecular formula C4H8O3S and a molecular weight of 136.17000 g/mol. Key properties include a boiling point of 280.8ºC at 760mmHg, a density of 1.28g/cm3 and a flash point of 123.6ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 1121-03-5
Jingsj CID: J-48493-8
Molecular Formula: C₄H₈O₃S
Molecular Weight: 136.17000 g/mol
Category: Esters
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	280.8ºC at 760mmHg
Density	1.28g/cm3
Flash Point	123.6ºC
Exact Mass	136.01900
PSA	51.75000
LogP	1.20580
Vapor Pressure	0.00631mmHg at 25°C
Refractive Index	1.458

Customs & Trade Information

HS Code	2934991000
Summary	2934991000. sultones and sultams. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 3-Methyl-1,2-oxathiolane 2,2-dioxide?

The CAS number of 3-Methyl-1,2-oxathiolane 2,2-dioxide is 1121-03-5.

What are the molecular formula and molecular weight of 3-Methyl-1,2-oxathiolane 2,2-dioxide?

3-Methyl-1,2-oxathiolane 2,2-dioxide has molecular formula C4H8O3S and molecular weight 136.17000 g/mol.

What are the upstream and downstream products of 3-Methyl-1,2-oxathiolane 2,2-dioxide?

For 3-Methyl-1,2-oxathiolane 2,2-dioxide, Upstream Products: 1-Chlorobutane, 1,3-Propanesultone, iodomethane.

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-Methyl-1,2-oxathiolane 2,2-dioxide (CAS 1121-03-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-48493-8 (accessed 2026-11-06).

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