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1-Butyl-3-methylimidazolium methanesulfonate

Also known as: 1-Butyl-3-methylimidazolium methanesulfonate, 1-Butyl-3-methyl-1H-imidazol-3-ium methanesulfonate, 1-Butyl-3-methyl-1H-imidazolium methanesulfonate, 1-Butyl-3-methylimidazolium mesylate, 1-n-Butyl-3-methylimidazolium methanesulfonate, BMIM CH3SO3, BASIONIC ST 78, BASIONIC(R) ST 78, BASIONIC(TM) ST 78

1-Butyl-3-methylimidazolium methanesulfonate (CAS 342789-81-5) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H18N2O3S and a molecular weight of 234.316 g/mol. Key properties include a melting point of 75-80ºC and a flash point of 119 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed and H314 — Causes severe skin burns and eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
342789-81-5
Jingsj CID
J-35837-2
Molecular Formula
C9H18N2O3S
Molecular Weight
234.316 g/mol
Category
Pharma Intermediates
Last updated
8/21/2026
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Physicochemical Properties

Melting Point75-80ºC
Flash Point119 °C
Exact Mass234.103806
PSA74.39000
LogP1.35490

GHS Safety & Compliance

Corrosion / Acute ToxicitySignal word: Danger
  • H301 — Toxic if swallowed
  • H314 — Causes severe skin burns and eye damage

Customs & Trade Information

HS Code2933290090
Summary2933290090. other compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 1-Butyl-3-methylimidazolium methanesulfonate?

The CAS number of 1-Butyl-3-methylimidazolium methanesulfonate is 342789-81-5.

What are the molecular formula and molecular weight of 1-Butyl-3-methylimidazolium methanesulfonate?

1-Butyl-3-methylimidazolium methanesulfonate has molecular formula C9H18N2O3S and molecular weight 234.316 g/mol.

Is 1-Butyl-3-methylimidazolium methanesulfonate hazardous?

1-Butyl-3-methylimidazolium methanesulfonate has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H314 — Causes severe skin burns and eye damage.

What are the upstream and downstream products of 1-Butyl-3-methylimidazolium methanesulfonate?

For 1-Butyl-3-methylimidazolium methanesulfonate, Upstream Products: 1-methylimidazole, Butyl methanesulfonate, Methanesulfonic acid; Downstream Products: 1-methylimidazole, 1-butyl-1H-imidazole, 1-Butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide.

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

Last updated:

How to cite: Jingsj. "1-Butyl-3-methylimidazolium methanesulfonate (CAS 342789-81-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-35837-2 (accessed 2026-11-09).

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