Alkynes

\ce{H-C#C} \ce{-H} Acetylene \ce{H-C#C}{-} \ce{\overset{\displaystyle{H} \atop |}{\underset{| \atop \displaystyle{HC \ce{-H} Propyne \ce{H-C#C}{-} \ce{\overset{\displaystyle{H} \atop |}{\underset{| \atop \displaystyle{HC{-} \ce{\overset{\displaystyle{H} \atop |}{\underset{| \atop \displaystyle{HC \ce{-H} 1-Butyne

Acetylene (systematic name: ethyne) is a chemical compound with the formula and structure . It is a hydrocarbon and the simplest alkyne. This colorless gas is widely used as a fuel and a chemical building block. It is unstable in its pure form and thus is usually handled as a solution. Pure acetylene is odorless, but commercial grades usually have a marked odor due to impurities such as divinyl sulfide and phosphine.

Propyne (methylacetylene) is an alkyne with the chemical formula . It is a component of MAPD gas—along with its isomer propadiene (allene), which was commonly used in gas welding. Unlike acetylene, propyne can be safely condensed.

1-Butyne is an organic compound with the formula . It is a terminal alkyne. The compound is a common terminal alkyne substrate in diverse studies of catalysis. It is a colorless combustible gas. In 2017, was produced in the USA.

2-Butyne (dimethylacetylene, crotonylene or but-2-yne) is an alkyne with chemical formula CH3C≡CCH3. Produced artificially, it is a colorless, volatile, pungent liquid at standard temperature and pressure.

1-Pentyne is an organic compound with the formula . It is a terminal alkyne, in fact the smallest that is liquid at room temperature. The compound is a common terminal alkyne substrate in diverse studies of catalysis.

1-Decyne is the organic compound with the formula C8H17C≡CH. It is a terminal alkyne. A colorless liquid, 1-decyne is used as a model substrate when evaluating methodology in organic synthesis. It participates in a number of classical reactions including Suzuki-Miyaura couplings, Sonogashira couplings, Huisgen cycloadditions, and borylations.

2-Pentyne, an organic compound with the formula CH3CH2C≡CCH3 and is an internal alkyne. It is an isomer of 1-pentyne, a terminal alkyne. thumb|left|100px|1-Pentyne

Pentyne may refer to:

polymeric allotrope of carbon

3-Hexyne is the organic compound with the formula C2H5CCC2H5. This colorless liquid is one of three isomeric hexynes. 3-Hexyne forms with 5-decyne, 4-octyne, and 2-butyne a series of symmetric alkynes. It is a reagent in organometallic chemistry.

Octynes are alkynes with one triple bond and the molecular formula C8H14.

1-Hexyne is a hydrocarbon consisting of a straight six-carbon chain having a terminal alkyne. Its molecular formula is . A colorless liquid, it is one of three isomers of hexyne. It is used as a reagent in organic synthesis.

thumb|right|The structure of a conjugated enyne

The hexynes are a subgroup from the group of alkynes. It consists of several isomeric compounds having the formula C6H10.

Nonynes are alkynes with one triple bond and the molecular formula C9H16.

Butyne is an alkyne that contains 4 carbon and 6 hydrogen. It contains one triple bond and has two isomeric organic chemical compounds: 1-Butyne (ethylacetylene) 2-Butyne (dimethylacetylene)

4-Octyne, also known as dipropylethyne, is a type of alkyne with a triple bond at its fourth carbon (the '4-' indicates the location of the triple bond in the chain). Its formula is C8H14.

2-Octyne, also known as methylpentylethyne and oct-2-yne, is a type of alkyne with a triple bond at its second carbon (the '2-' indicates the location of the triple bond in the chain). Its formula is C8H14. Its density at 25 °C and otherwise stable conditions is 0.759 g/ml. The boiling point is 137 °C. The average molar mass is 110.20 g/mol.

Decynes are alkynes with one triple bond and the molecular formula C10H18.

Heptynes are alkynes with one triple bond and the molecular formula C7H12.

chemical compound

chemical compound

5-Decyne, also known as dibutylethyne, is a type of alkyne with a triple bond at its fifth carbon (the '5-' indicates the location of the triple bond in the chain). Its formula is C10H18. Its density at 25 °C and otherwise standard conditions is 0.766 g/ml. The boiling point is 177 °C. The average molar mass is 138.25 g/mol.

2-Hexyne is an organic compound that belongs to the alkyne group. Just like its isomers, it also has the chemical formula of C6H10.

Propynylidyne is a chemical compound that has been identified in interstellar space.

thumb|220px|right|Ethynyl group (highlighted red) as part of a large molecule ([[ethinylestradiol).]]