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[[File:2-butyne-3D-balls-B.png|thumb|3D model of 2-Butyne]]<br />
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'''2-Butyne''', also known as '''dimethylacetylene''', is an [[alkyne]] with the chemical formula <chem>H_3C-C#C-CH_3</chem>. It is a member of the [[butyne]] family, which consists of [[alkynes]] with four carbon atoms and a triple bond between two of them.<br />
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== Structure and Properties ==<br />
2-Butyne is a symmetrical alkyne, meaning it has a triple bond between the second and third carbon atoms in its carbon chain. The molecule is linear around the triple bond, with a bond angle of approximately 180 degrees. The presence of the triple bond gives 2-butyne its characteristic properties, such as a higher boiling point compared to its alkene and alkane counterparts.<br />
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== Synthesis ==<br />
2-Butyne can be synthesized through various methods, including the dehydrohalogenation of 2,3-dibromobutane or by the reaction of acetylene with methyl iodide in the presence of a strong base. These methods involve the removal of halogen atoms or the addition of methyl groups to form the triple bond characteristic of alkynes.<br />
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== Reactions ==<br />
As an alkyne, 2-butyne undergoes typical reactions associated with triple bonds. These include:<br />
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* '''Hydrogenation''': 2-Butyne can be hydrogenated to form [[butane]] or [[2-butene]], depending on the conditions and catalysts used.<br />
* '''Halogenation''': It reacts with halogens to form dihaloalkanes.<br />
* '''Hydration''': In the presence of acid and mercury(II) salts, 2-butyne can be hydrated to form [[ketones]].<br />
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== Uses ==<br />
2-Butyne is used in organic synthesis as a building block for more complex molecules. It serves as a precursor in the synthesis of pharmaceuticals, agrochemicals, and other industrial chemicals. Its reactivity makes it a valuable intermediate in various chemical reactions.<br />
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== Safety ==<br />
2-Butyne is a flammable liquid and should be handled with care. It can form explosive mixtures with air and should be stored in a cool, well-ventilated area away from sources of ignition.<br />
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== Related Pages ==<br />
* [[Alkyne]]<br />
* [[Butyne]]<br />
* [[Hydrogenation]]<br />
* [[Organic synthesis]]<br />
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[[Category:Alkynes]]<br />
[[Category:Hydrocarbons]]</div>Prab