Phenylbutazone
Also known as: Butazolidin, 4-Butyl-1,2-diphenyl-3,5-pyrazolidinedione, 1,2-Diphenyl-4-butyl-3,5-pyrazolidinedione, Diphenylbutazone, Phenylbutazone (USAN), Azolid, Butadione, Butalidon, Butapirazol, Butazina, Butidiona, Fenibutazona, Fenilbutina, Fenotone, Fenylbutazon, Mephabutazon, Phen-Buta, Reudo, Reumazin, Robizone
Phenylbutazone (CAS 50-33-9) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C19H20N2O2 and a molecular weight of 308.38100 g/mol. Key properties include a melting point of 104-107 °C, a boiling point of 240.4±23.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 99.2±22.6 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H312 — Harmful in contact with skin and H332 — Harmful if inhaled. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.
- CAS No.
- 50-33-9
- Jingsj CID
- J-8255-3
- Molecular Formula
- C19H20N2O2
- Molecular Weight
- 308.38100 g/mol
- Category
- Organic Compounds
- Last updated
- 11/2/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 104-107 °C |
|---|---|
| Boiling Point | 240.4±23.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 99.2±22.6 °C |
| Exact Mass | 184.984009 |
| PSA | 40.62000 |
| LogP | 2.76 |
| Vapor Pressure | 0.0±0.5 mmHg at 25°C |
| Refractive Index | 1.613 |
| Stability | Stable. Incompatible with strong oxidizing agents, strong acids, strong bases. |
| Additional Property | <0.1 g/100 mL at 23.5 ºC |
GHS Safety & Compliance
- H301 — Toxic if swallowed
- H312 — Harmful in contact with skin
- H332 — Harmful if inhaled
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Activity & Biological Data
| Target | COX-2:1.1 μM (IC50) COX-1:3.7 μM (IC50) |
|---|---|
| Additional Information | [1]. Beretta C, et al. COX-1 and COX-2 inhibition in horse blood by phenylbutazone, flunixin, carprofen and meloxicam: an in vitro analysis. Pharmacol Res. 2005 Oct;52(4):302-6. |
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 Phenylbutazone?
The CAS number of Phenylbutazone is 50-33-9.
What are the molecular formula and molecular weight of Phenylbutazone?
Phenylbutazone has molecular formula C19H20N2O2 and molecular weight 308.38100 g/mol.
Is Phenylbutazone hazardous?
Phenylbutazone has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H312 — Harmful in contact with skin; H332 — Harmful if inhaled.
What are the upstream and downstream products of Phenylbutazone?
For Phenylbutazone, Upstream Products: Diethyl 2-butylmalonate, 1,2-Diphenylhydrazine, 1-Bromobutane; Downstream Products: Bumadizone, Oxyphenbutazone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Phenylbutazone (CAS 50-33-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-8255-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.