4,5-Dimethylthiazole
Also known as: Thiazole, 4,5-dimethyl-, FEMA 3274, FEMA NUMBER 3274, 4,5-Dimethyl-1,3-thiazole, 4,5-Dimethyl-thiazol, 4,5-Dimethylthiazole,98%, EINECS 222-703-3, MFCD00005336, 4,5-dimethyl-1,3-thiazole, 4,5-dimethyl-thiazol, 4-27-00-00986 (Beilstein Handbook Reference), Thiazole,4,5-dimethyl, dimethylthiazole,4,5-dimethylthiazole
4,5-Dimethylthiazole (CAS 3581-91-7) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H7NS and a molecular weight of 113.181 g/mol. Key properties include a melting point of 83-84ºC, a boiling point of 158.1±9.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 51.1±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H226 — Flammable liquid and vapour, H302 — Harmful if swallowed and H315 — Causes skin irritation. It is listed by 1 supplier, from 39.60 to 60.60 CNY. Record last updated Aug 21, 2026.
- CAS No.
- 3581-91-7
- Jingsj CID
- J-38705-3
- Molecular Formula
- C5H7NS
- Molecular Weight
- 113.181 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | >97.0%(GC) 25g | ¥990.00 | $5.93 /gBest ¥39.60/g CNY | CN China MOQ 25g | |
In Stock | >97.0%(GC) 5g | ¥303.00 | $9.07 /g ¥60.60/g CNY | CN China MOQ 5g |
Physicochemical Properties
| Melting Point | 83-84ºC |
|---|---|
| Boiling Point | 158.1±9.0 °C at 760 mmHg |
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 51.1±0.0 °C |
| Exact Mass | 113.029922 |
| PSA | 41.13000 |
| LogP | 1.36 |
| Vapor Pressure | 3.5±0.3 mmHg at 25°C |
| Refractive Index | 1.531 |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H318 — Causes serious eye damage
- 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 4,5-Dimethylthiazole?
The CAS number of 4,5-Dimethylthiazole is 3581-91-7.
What are the molecular formula and molecular weight of 4,5-Dimethylthiazole?
4,5-Dimethylthiazole has molecular formula C5H7NS and molecular weight 113.181 g/mol.
Which suppliers offer 4,5-Dimethylthiazole?
1 supplier(s) listed; reference unit price ¥39.60–60.60 /g.
Is 4,5-Dimethylthiazole hazardous?
4,5-Dimethylthiazole has GHS signal word Danger and hazard statements H226 — Flammable liquid and vapour; H302 — Harmful if swallowed; H315 — Causes skin irritation.
What are the upstream and downstream products of 4,5-Dimethylthiazole?
For 4,5-Dimethylthiazole, Upstream Products: Methanimidic acid, (Z)-, 3-Bromo-2-butanone, 4,5-Dimethyl-1,3-thiazol-2-amine; Downstream Products: 4-(Chloromethyl)-5-methylthiazole, 4-Methylthiazole-5-carboxaldehyde, 4,5-Dimethyl-1,3-thiazole-2-carboxylic acid.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "4,5-Dimethylthiazole (CAS 3581-91-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-38705-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.