2-Pentynoic acid
Also known as: Pent-2-ynoic acid, Ethylacetylene carboxylic acid, NSC 289567, 2-Pentynoic acid (non-standard)
2-Pentynoic acid (CAS 5963-77-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H6O2 and a molecular weight of 98.09990 g/mol. Key properties include a melting point of 48-50ºC, a boiling point of 125ºC 30mm, a density of 1.102g/cm3 and a flash point of 96ºC. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 5963-77-9
- Jingsj CID
- J-1492877-9
- Molecular Formula
- C5H6O2
- Molecular Weight
- 98.09990 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 48-50ºC |
|---|---|
| Boiling Point | 125ºC 30mm |
| Density | 1.102g/cm3 |
| Flash Point | 96ºC |
| Exact Mass | 98.03680 |
| PSA | 37.30000 |
| LogP | 0.48440 |
| Refractive Index | 1.468 |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2916190090 |
|---|---|
| Summary | 2916190090 unsaturated acyclic monocarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and their derivatives。supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward)。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 2-Pentynoic acid?
The CAS number of 2-Pentynoic acid is 5963-77-9.
What are the molecular formula and molecular weight of 2-Pentynoic acid?
2-Pentynoic acid has molecular formula C5H6O2 and molecular weight 98.09990 g/mol.
Is 2-Pentynoic acid hazardous?
2-Pentynoic acid has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of 2-Pentynoic acid?
For 2-Pentynoic acid, Upstream Products: ethyl pent-2-ynoate, Carbon dioxide, 1-butyne; Downstream Products: Methyl 2-pentynoate, ethyl pent-2-ynoate, 3-Pentyn-1-ol.
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-Pentynoic acid (CAS 5963-77-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1492877-9 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.