4-Hydroxybut-2-ynoic acid
Also known as: 4-Hydroxy-2-butynoic acid, 2-Butynoic acid, 4-hydroxy-, 4-HYDROXY-BUT-2-YNOIC ACID, Hydroxytetrolic acid, NSC 620042, g-Hydroxytetrolic acid, hydroxy-but-2-ynoic acid
4-Hydroxybut-2-ynoic acid (CAS 7218-52-2) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C4H4O3 and a molecular weight of 100.07300 g/mol. Key properties include a melting point of 115-116 °C, a boiling point of 319.2ºC at 760 mmHg, a density of 1.429 g/cm3 and a flash point of 161ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 7218-52-2
- Jingsj CID
- J-1161892-1
- Molecular Formula
- C4H4O3
- Molecular Weight
- 100.07300 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 115-116 °C |
|---|---|
| Boiling Point | 319.2ºC at 760 mmHg |
| Density | 1.429 g/cm3 |
| Flash Point | 161ºC |
| Exact Mass | 100.01600 |
| PSA | 57.53000 |
| Storage Conditions | 2-8°C |
Customs & Trade Information
| HS Code | 2918199090 |
|---|---|
| Summary | 2918199090 other carboxylic acids with alcohol function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their derivatives。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 4-Hydroxybut-2-ynoic acid?
The CAS number of 4-Hydroxybut-2-ynoic acid is 7218-52-2.
What are the molecular formula and molecular weight of 4-Hydroxybut-2-ynoic acid?
4-Hydroxybut-2-ynoic acid has molecular formula C4H4O3 and molecular weight 100.07300 g/mol.
What are the upstream and downstream products of 4-Hydroxybut-2-ynoic acid?
For 4-Hydroxybut-2-ynoic acid, Upstream Products: 2-Butyne-1,4-diol, 2-(propargyloxy)tetrahydropyran, Ethylmagnesium bromide; Downstream Products: Pterin-6-carboxylic acid, 2(5H)-Furanone, Methyl 4-hydroxy-2-butynoate.
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-Hydroxybut-2-ynoic acid (CAS 7218-52-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1161892-1 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.