1-Methyl-1H-pyrazole-5-carbaldehyde
Also known as: 1-Methylpyrazole-5-carbaldehyde, 1-Methyl-1H-pyrazol-5-carbaldehyde, 1-Methyl-1H-pyrazole-5-carboxaldehyde, 2-Methyl-2H-pyrazole-3-carbaldehyde, 5-Formyl-1-methylpyrazole, 1H-Pyrazole-5-carboxaldehyde, 1-methyl-, 2-Methylpyrazole-3-carbaldehyde, MFCD03419801
1-Methyl-1H-pyrazole-5-carbaldehyde (CAS 27258-33-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H6N2O and a molecular weight of 110.114 g/mol. Key properties include a boiling point of 218.9±13.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 86.2±19.8 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H317 — May cause an allergic skin reaction. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 27258-33-9
- Jingsj CID
- J-1523767-9
- Molecular Formula
- C5H6N2O
- Molecular Weight
- 110.114 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 218.9±13.0 °C at 760 mmHg |
|---|---|
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 86.2±19.8 °C |
| Exact Mass | 110.048012 |
| PSA | 34.89000 |
| LogP | -0.61 |
| Vapor Pressure | 0.1±0.4 mmHg at 25°C |
| Refractive Index | 1.552 |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H317 — May cause an allergic skin reaction
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2933199090 |
|---|---|
| Summary | 2933199090. other compounds containing an unfused pyrazole 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-Methyl-1H-pyrazole-5-carbaldehyde?
The CAS number of 1-Methyl-1H-pyrazole-5-carbaldehyde is 27258-33-9.
What are the molecular formula and molecular weight of 1-Methyl-1H-pyrazole-5-carbaldehyde?
1-Methyl-1H-pyrazole-5-carbaldehyde has molecular formula C5H6N2O and molecular weight 110.114 g/mol.
Is 1-Methyl-1H-pyrazole-5-carbaldehyde hazardous?
1-Methyl-1H-pyrazole-5-carbaldehyde has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H317 — May cause an allergic skin reaction.
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-Methyl-1H-pyrazole-5-carbaldehyde (CAS 27258-33-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1523767-9 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.