2,4-Dihydroxypyridine
Also known as: 2,4-Pyridinediol, 4-Hydroxy-2-pyridone, 3-Deazauracil, 4-Hydroxypyridin-2(1H)-one, Pyridine-2,4-diol
2,4-Dihydroxypyridine (CAS 626-03-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H5NO2 and a molecular weight of 111.099 g/mol. Key properties include a melting point of 272-276 °C(lit.), a boiling point of 509.8±30.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 262.1±24.6 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 626-03-9
- Jingsj CID
- J-48821-1
- Molecular Formula
- C5H5NO2
- Molecular Weight
- 111.099 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 272-276 °C(lit.) |
|---|---|
| Boiling Point | 509.8±30.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 262.1±24.6 °C |
| Exact Mass | 111.032028 |
| PSA | 53.35000 |
| LogP | -2.65 |
| Vapor Pressure | 0.0±1.4 mmHg at 25°C |
| Refractive Index | 1.625 |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- 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 2,4-Dihydroxypyridine?
The CAS number of 2,4-Dihydroxypyridine is 626-03-9.
What are the molecular formula and molecular weight of 2,4-Dihydroxypyridine?
2,4-Dihydroxypyridine has molecular formula C5H5NO2 and molecular weight 111.099 g/mol.
Is 2,4-Dihydroxypyridine hazardous?
2,4-Dihydroxypyridine has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of 2,4-Dihydroxypyridine?
For 2,4-Dihydroxypyridine, Upstream Products: 2,4-Dimethoxypyridine, 4-Hydroxypyridine, 3-Cyano-1,2-dihydro-4-hydroxy-2-oxopyridine; Downstream Products: 4-Hydrazinylpyridin-2(1H)-one, 4-Aminopyridin-2(1H)-one, 2,4-Dibromopyridine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,4-Dihydroxypyridine (CAS 626-03-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-48821-1 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.