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1-Butyne vs. 2-Butyne: What's the Difference?

Edited by Aimie Carlson || By Harlon Moss || Published on January 10, 2024
1-Butyne is a terminal alkyne with the triple bond at the end of the carbon chain, while 2-butyne is an internal alkyne with the triple bond at the second carbon atom.

Key Differences

1-Butyne is an organic compound characterized by a triple bond between the first and second carbon atoms in its four-carbon chain. In contrast, 2-butyne has its triple bond between the second and third carbon atoms.
The position of the triple bond in 1-butyne makes it a terminal alkyne, meaning the triple bond is at the end of the carbon chain. 2-butyne is an internal alkyne, as its triple bond is located between internal carbon atoms.
This structural difference impacts the chemical reactivity of 1-butyne and 2-butyne. 1-butyne tends to undergo reactions typical of terminal alkynes, like acid-base reactions with ammonia. 2-butyne, however, shows reactivity more akin to internal alkynes.
In terms of synthesis and applications, 1-butyne is often used in organic synthesis and can be a starting material for other chemicals. 2-butyne, with its different structure, has slightly different uses and is also important in various chemical syntheses.
The physical properties of 1-butyne and 2-butyne, such as boiling points, are also slightly different due to their structural dissimilarities. Both compounds are important in the field of organic chemistry for their unique properties and reactions.

Comparison Chart

Location of Triple Bond

Between first and second carbon atoms
Between second and third carbon atoms

Type of Alkyne

Terminal alkyne
Internal alkyne

Chemical Reactivity

Undergoes reactions typical of terminal alkynes
Shows reactivity like internal alkynes

Uses and Applications

Used in organic synthesis, versatile
Used in specific chemical syntheses

Physical Properties

Slightly different boiling point and reactivity
Different boiling point and reactivity compared to 1-butyne

1-Butyne and 2-Butyne Definitions


Has distinct reactivity due to its terminal alkyne structure.
The reactivity of 1-butyne makes it suitable for various addition reactions.


Less reactive in certain reactions compared to terminal alkynes.
2-Butyne does not react as readily as 1-butyne in certain addition reactions.


Can participate in acid-base reactions typical of alkynes.
1-butyne reacts with ammonia to form a product with a nitrogen triple-bonded to carbon.


Its structure impacts its boiling point and physical properties.
The boiling point of 2-butyne is different from that of 1-butyne due to its internal triple bond.


Contains four carbon atoms with a C≡C bond at the first carbon.
In 1-butyne, the triple bond's position significantly influences its chemical reactions.


Used in specialized organic synthesis and industrial applications.
2-Butyne is a key component in some specific chemical manufacturing processes.


A terminal alkyne with a triple bond at the end of the carbon chain.
1-Butyne is more reactive than 2-butyne due to its terminal triple bond.


Contains four carbon atoms with a central C≡C bond.
In 2-butyne, the central placement of the triple bond leads to different synthesis routes.


Often used as a building block in organic chemistry.
Synthetic chemists frequently use 1-butyne in constructing complex molecules.


An internal alkyne with a triple bond between the second and third carbons.
2-Butyne's internal triple bond location affects its chemical behavior.


Where is the triple bond located in 2-butyne?

The triple bond in 2-butyne is located between the central carbon atoms of the chain.

What is 1-butyne?

1-Butyne is a terminal alkyne with a triple bond at the beginning of a four-carbon chain.

How is 2-butyne different from 1-butyne?

2-Butyne is an internal alkyne with the triple bond between the second and third carbon atoms.

How does the reactivity of 2-butyne compare to 1-butyne?

2-Butyne is less reactive in certain types of chemical reactions compared to 1-butyne.

How is 2-butyne synthesized?

2-Butyne is synthesized through controlled chemical reactions involving acetylene or other alkynes.

Can 1-butyne be used in polymer synthesis?

Yes, 1-butyne can be used as a building block in polymer and other organic syntheses.

What type of reactions is 1-butyne known for?

1-Butyne typically undergoes addition reactions and acid-base reactions common to terminal alkynes.

What is the main use of 2-butyne in industry?

2-Butyne is used in specialized chemical syntheses and industrial applications.

What are the physical properties of 1-butyne?

1-Butyne is a colorless gas with distinct reactivity and boiling points.

Are 1-butyne and 2-butyne isomers?

Yes, they are positional isomers, differing in the location of the triple bond.

Can 2-butyne be used in medicinal chemistry?

Its use in medicinal chemistry is limited but possible in specific synthetic routes.

Is 2-butyne more stable than 1-butyne?

2-Butyne is generally more stable due to its internal triple bond.

What is the boiling point of 1-butyne?

1-Butyne has a boiling point that is distinct due to its terminal alkyne structure.

Are there environmental concerns with 1-butyne?

As with many industrial chemicals, proper handling and disposal of 1-butyne are essential to minimize environmental impact.

Can 1-butyne participate in hydrogenation reactions?

Yes, like other alkynes, 1-butyne can undergo hydrogenation.

Does 2-butyne react with ammonia?

2-Butyne's reactivity with ammonia is different from 1-butyne due to its internal alkyne nature.

How are 1-butyne and 2-butyne stored?

They are stored under controlled conditions to prevent unwanted reactions and ensure safety.

What makes 2-butyne unique in its chemical behavior?

Its internal triple bond placement gives it unique reactivity and properties.

Is 1-butyne found in nature?

1-Butyne is not typically found in nature and is usually synthesized in laboratories.

Are 1-butyne and 2-butyne soluble in water?

Both compounds have limited solubility in water, typical of hydrocarbons.
About Author
Written by
Harlon Moss
Harlon is a seasoned quality moderator and accomplished content writer for Difference Wiki. An alumnus of the prestigious University of California, he earned his degree in Computer Science. Leveraging his academic background, Harlon brings a meticulous and informed perspective to his work, ensuring content accuracy and excellence.
Edited by
Aimie Carlson
Aimie Carlson, holding a master's degree in English literature, is a fervent English language enthusiast. She lends her writing talents to Difference Wiki, a prominent website that specializes in comparisons, offering readers insightful analyses that both captivate and inform.

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