But-2-yne
Also known as: 1,2-dimethylvinylene, 1-methyl-1-propynyl, 2-BUTYNE 98%, 2-Butyne, 2-Butyne,98%, Butyne, CH3CequivCCH3, CROTONYLENE(DOT), Crotonylene, Crotonylene, Dimethylacetylene, Crotonylenetylene, Dimethyl acetylene, Dimethylacetylene, EINECS 207-962-2, MFCD00009275, UN1144, but-2-yne
But-2-yne (CAS 503-17-3) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C4H6 and a molecular weight of 54.090 g/mol. Key properties include a melting point of -32 °C, a boiling point of 25.6±3.0 °C at 760 mmHg, a density of 0.7±0.1 g/cm3 and a flash point of -48.5±11.2 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 503-17-3
- Jingsj CID
- J-1243-0
- Molecular Formula
- C4H6
- Molecular Weight
- 54.090 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -32 °C |
|---|---|
| Boiling Point | 25.6±3.0 °C at 760 mmHg |
| Density | 0.7±0.1 g/cm3 |
| Flash Point | -48.5±11.2 °C |
| Exact Mass | 54.046951 |
| LogP | 1.46 |
| Vapor Pressure | 745.1±0.0 mmHg at 25°C |
| Refractive Index | 1.393 |
Frequently Asked Questions
What is the CAS number of But-2-yne?
The CAS number of But-2-yne is 503-17-3.
What are the molecular formula and molecular weight of But-2-yne?
But-2-yne has molecular formula C4H6 and molecular weight 54.090 g/mol.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "But-2-yne (CAS 503-17-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1243-0 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.