5-Methylthiazole
Also known as: 5-Methyl-1,3-thiazole, Thiazole, 5-methyl-, MFCD00005335
5-Methylthiazole (CAS 3581-89-3) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H5NS and a molecular weight of 99.154 g/mol. Key properties include a melting point of -40.4ºC, a boiling point of 142.2±0.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 42.2±0.0 °C. It is classified under GHS with signal word Warning and hazard statements H226 — Flammable liquid and vapour, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 3581-89-3
- Jingsj CID
- J-1369839-0
- Molecular Formula
- C4H5NS
- Molecular Weight
- 99.154 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -40.4ºC |
|---|---|
| Boiling Point | 142.2±0.0 °C at 760 mmHg |
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 42.2±0.0 °C |
| Exact Mass | 99.014267 |
| PSA | 41.13000 |
| LogP | 0.90 |
| Vapor Pressure | 7.1±0.2 mmHg at 25°C |
| Refractive Index | 1.536 |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2934100090 |
|---|---|
| Summary | 2934100090 other compounds containing an unfused thiazole ring (whether or not hydrogenated) in the structure VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:6.5% General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of 5-Methylthiazole?
The CAS number of 5-Methylthiazole is 3581-89-3.
What are the molecular formula and molecular weight of 5-Methylthiazole?
5-Methylthiazole has molecular formula C4H5NS and molecular weight 99.154 g/mol.
Is 5-Methylthiazole hazardous?
5-Methylthiazole has GHS signal word Warning and hazard statements H226 — Flammable liquid and vapour; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of 5-Methylthiazole?
For 5-Methylthiazole, Upstream Products: 2-bromopropanal, Methanimidic acid, (Z)-, 2-Amino-5-methylthiazole; Downstream Products: 2-Bromo-5-methylthiazole, 5-Chloromethylthiazole, 5-Methyl-1,3-thiazole-2-carboxaldehyde.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "5-Methylthiazole (CAS 3581-89-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1369839-0 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.