But-1-yne

A terminal alkyne with an acidic hydrogen at the triple bond.

Formula
C4H6
Molar mass
54.09 g/mol
Also known as
1-BUTYNE, Ethyl acetylene, Butyne-1, UN2452, A6B47CPN6W

Overview

A terminal alkyne with an acidic hydrogen at the triple bond.

Its terminal hydrogen can be removed by a sufficiently strong base to form an acetylide. This property differs from the behaviour of internal but-2-yne. Under mercury-catalysed hydration, the carbon skeleton is retained and the carbonyl product is butan-2-one.

Identifiers

Formula
C4H6
Molar mass
54.09 g/mol
Also known as
1-BUTYNE, Ethyl acetylene, Butyne-1, UN2452, A6B47CPN6W
Chemical identifiers
SMILES
CCC#C
InChI
InChI=1S/C4H6/c1-3-4-2/h1H,4H2,2H3
PubChem CID
7846
Data availability

Not published: Melting Point, Boiling Point, Density, Solubility.

Related compounds

  • Alkynes

    But-1-yne is a specific member of the alkynes family.

References

  1. PubChem Compound Summary: But-1-yne (CID 7846)National Center for Biotechnology Information · PubChem

    Identity, molecular formula, molecular weight and aliases retrieved via PUG REST on 2026-09-08.

  2. OpenStax Organic Chemistry: Alkyne acidity: formation of acetylide anionsJohn McMurry · OpenStax · 2023

    Supports the qualitative structure and reactivity context; identity and numerical measurements retain their original references.

  3. OpenStax Organic Chemistry: Hydration of alkynesJohn McMurry · OpenStax · 2023

    Supports the qualitative structure and reactivity context; identity and numerical measurements retain their original references.