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Pent-2-yne

Also known as: 1-Ethyl-2-methylacetylene, 2-PENTYNE, 2-PENTYNE 98%, 2-Pentyne, 2-Pentyne, 98% 5GR, 2-Pentyne,98+%, C2H5CequivCCH3, CH3C≡CCH2CH3, EINECS 210-989-2, ETHYLMETHYLACETYLENE, Ethylmethylacetylene, MFCD00009380, Pent-2-in, Valerylene, pent-2-yne, trans 2-pentyne

Pent-2-yne (CAS 627-21-4) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C5H8 and a molecular weight of 68.117 g/mol. Key properties include a melting point of −109 °C(lit.), a boiling point of 56.7±3.0 °C at 760 mmHg, a density of 0.7±0.1 g/cm3 and a flash point of -28.1±11.2 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
627-21-4
Jingsj CID
J-1314394-5
Molecular Formula
C5H8
Molecular Weight
68.117 g/mol
Category
Aliphatic Hydrocarbons
Last updated
8/21/2026
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Physicochemical Properties

Melting Point−109 °C(lit.)
Boiling Point56.7±3.0 °C at 760 mmHg
Density0.7±0.1 g/cm3
Flash Point-28.1±11.2 °C
Exact Mass68.062599
LogP1.99
Vapor Pressure237.4±0.0 mmHg at 25°C
Refractive Index1.407

Frequently Asked Questions

What is the CAS number of Pent-2-yne?

The CAS number of Pent-2-yne is 627-21-4.

What are the molecular formula and molecular weight of Pent-2-yne?

Pent-2-yne has molecular formula C5H8 and molecular weight 68.117 g/mol.

What are the upstream and downstream products of Pent-2-yne?

For Pent-2-yne, Upstream Products: Pent-1-yne, 3,3-Dimethyl-1-butene, Isobutylene; Downstream Products: 1,3-Pentadiene, CIS-2-PENTENE, Pent-1-ene.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Pent-2-yne (CAS 627-21-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1314394-5 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.