4-Hydroxypyridine
Also known as: 4-Pyridinol, 4-Pyridone, Pyridin-4-ol, 4(1H)-Pyridinone, 1H-Pyridin-4-ol, gamma-Hydroxypyridine, p-Hydroxypyridine
4-Hydroxypyridine (CAS 626-64-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H5NO and a molecular weight of 95.10 g/mol. Key properties include a melting point of 150-151 °C(lit.), a boiling point of 380.6±0.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 182.3±20.4 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H318 — Causes serious eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 626-64-2
- Jingsj CID
- J-1003071-4
- Molecular Formula
- C5H5NO
- Molecular Weight
- 95.10 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 150-151 °C(lit.) |
|---|---|
| Boiling Point | 380.6±0.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 182.3±20.4 °C |
| Exact Mass | 95.037117 |
| PSA | 33.12000 |
| LogP | -1.30 |
| Vapor Pressure | 0.0±0.9 mmHg at 25°C |
| Refractive Index | 1.560 |
| Additional Property | Soluble |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H318 — Causes serious eye damage
- H335 — May cause respiratory irritation
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 4-Hydroxypyridine?
The CAS number of 4-Hydroxypyridine is 626-64-2.
What are the molecular formula and molecular weight of 4-Hydroxypyridine?
4-Hydroxypyridine has molecular formula C5H5NO and molecular weight 95.10 g/mol.
Is 4-Hydroxypyridine hazardous?
4-Hydroxypyridine has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H318 — Causes serious eye damage.
What are the upstream and downstream products of 4-Hydroxypyridine?
For 4-Hydroxypyridine, Upstream Products: 4-Methoxypyridine, 4-Iodopyridine, 1-(4-Pyridyl)pyridinium chloride hydrochloride; Downstream Products: Methyl 4-(pyridin-4-yl)benzoate, 4-Hydroxy-3-nitropyridine, 4-(4-Methoxyphenyl)pyridine.
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-Hydroxypyridine (CAS 626-64-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1003071-4 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.