2,3,5-Trimethylpyridine 1-oxide

Also known as: 2,3,5-Trimethylpyridine N-oxide, 2,3,5-Collidine N-Oxide, 2,3,5-Trimethylpyridine-1-Oxide, 2,3,5-trimethyl-1-oxidopyridin-1-ium, 2,3,5-trimethyl-pyridine 1-oxide, Esomeprazole Impurity 20, Esomeprazole Sodium Impurity 35, Omeprazole Related Compound 4, Pyridine, 2,3,5-trimethyl-, 1-oxide

2,3,5-Trimethylpyridine 1-oxide (CAS 74409-42-0) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C8H11NO and a molecular weight of 137.17900 g/mol. Key properties include a melting point of 40-41 ºC and a density of 0.99±0.1 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 74409-42-0
Jingsj CID: J-1460432-1
Molecular Formula: C₈H₁₁NO
Molecular Weight: 137.17900 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	40-41 ºC
Density	0.99±0.1 g/cm3
Exact Mass	137.08400
PSA	25.46000
LogP	2.04030
Additional Property	Sparingly soluble (18 g/L) (25 ºC)

Customs & Trade Information

HS Code	2933399090
Summary	2933399090. other compounds containing an unfused pyridine 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 2,3,5-Trimethylpyridine 1-oxide?

The CAS number of 2,3,5-Trimethylpyridine 1-oxide is 74409-42-0.

What are the molecular formula and molecular weight of 2,3,5-Trimethylpyridine 1-oxide?

2,3,5-Trimethylpyridine 1-oxide has molecular formula C8H11NO and molecular weight 137.17900 g/mol.

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. "2,3,5-Trimethylpyridine 1-oxide (CAS 74409-42-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1460432-1 (accessed 2026-11-09).

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