alkyne

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alkyne

(ăl`kīn), any of a group of aliphatic hydrocarbons whose molecules contain one or more carbon-carbon triple bonds (see chemical bondchemical bond,
mechanism whereby atoms combine to form molecules. There is a chemical bond between two atoms or groups of atoms when the forces acting between them are strong enough to lead to the formation of an aggregate with sufficient stability to be regarded as an
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). Alkynes with one triple bond have the general formula CnH2n−2. In the International Union of Pure and Applied Chemistry (IUPAC) system of chemical nomenclature, the name of an alkyne is derived from the name of the corresponding alkanealkane
, any of a group of aliphatic hydrocarbons whose molecules contain only single bonds (see chemical bond). Alkanes have the general chemical formula CnH2n+2.
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 by replacing the -ane alkane suffix with -yne and, if necessary, adding a prefix to indicate the location of the triple bond in the molecule. The IUPAC name of the simplest alkyne, HC≡CH, is thus ethyne, which is derived from ethane. Ethyne is more commonly known as acetyleneacetylene
or ethyne
, HC≡CH, a colorless gas. It melts at −80.8°C; and boils at −84.0°C;. Offensive odors often noted in commercial acetylene are due to impurities. Acetylene forms explosive mixtures with oxygen or air.
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; it is an extremely important starting material in commercial chemical synthesis. The next simplest alkyne is propyne, CH3C≡CH. There are two butynes, 1-butyne and 2-butyne, which are structural isomersisomer
, in chemistry, one of two or more compounds having the same molecular formula but different structures (arrangements of atoms in the molecule). Isomerism is the occurrence of such compounds. Isomerism was first recognized by J. J. Berzelius in 1827.
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 that differ in the location of the triple bond in their molecule. The alkynes are sometimes referred to as the acetylene series, the higher members of the series being named as derivatives of acetylene, e.g., propyne as methylacetylene, 1-butyne as ethylacetylene, and 2-butyne as dimethylacetylene. The usefulness of the alkynes in chemical synthesis is due both to the reactions of the triple bond itself and to the relative acidity of a hydrogen atom bonded to a triply bonded carbon.

alkyne

[′al‚kīn]
(organic chemistry)
One of a group of organic compounds containing a carbon-to-carbon triple bond.
References in periodicals archive ?
Caption: FIGURE 3: Huisgen [3 + 2] cycloaddition reaction: the copper-catalyzed 1,3-dipolar cycloaddition of an azide to an alkyne to create 1,2,3-triazoles.
For example in case of basic solution n-hexane fraction shown in Figure-1, contains peaks for the amide, alkyne and hydroxyl group, that for chloroform fraction the spectrum shown in Figure-2, contain peaks for amines, amides, alcohol and phenols.
Zhu, "Facile synthesis of novel C[F.sub.3]-substituted ring-fused furo[2,3-c]pyrazoles through [Rh.sub.2][(OAc).sub.4] catalyzed [3+2] cycloaddition of 4-diazo-1-phenyl3-(trifluoromethyl)-1H-pyrazol-5(4H)-one with aromatic alkynes," Tetrahedron, vol.
Why did the discovery of the alkene ZACA reaction take such a long time, i.e., 17 years, after the discovery of the Zr-catalyzed carboalumination of alkynes? Arguably, carbometalation is fundamentally less facile than hydrometalation for various reasons which are not discussed here except to point out more stringent steric requirements stemming from shear bulk and more highly directional properties of C relative to H, just to mention a few.
The band at 2923 [cm.sup.-1] shows C-H stretching of aliphatic group [39] and 2329 [cm.sup.-1 because of C[equivalent to]C of alkynes, respectively [16].
In addition, the research terms have developed a number of MEMS gas sensors such as for chlorine, aviation kerosene, gasoline, alkynes, alkenes, hydrocarbon, ammonia, ketene, alcohol, benzene, and glacial acetic acid.
Wakatsuki, "Isolation and structural characterization of 1-zirconacyclopent-3-yne, five-membered cyclic alkynes," Science, vol.
Cycloaddition of thiophene S-oxides to allenes, alkynes and to benzyne, New Journal of Chemistry, 27: 1377-1384.
Treatment of azide 8 with alkynes proceeded smoothly in the presence of a catalytic amount of CuS[O.sub.4] and sodium ascorbate in a 10% solution of DMSO in water to produce 1,4-disubstituted-1,2,3-triazole derivatives 11 and 12 in good yields, respectively.
The IR findings revealed involvement of carboxyl (-COOH), hydroxyl (-OH), amides (-NH), amine (-NH), alkynes (CH), alkanes (CH2, CH3), ethers (C-O), ketones (C=O) and some other miscellaneous groups i.e.
In this way the 1,2,4-triazines can be reacted with alkynes to form pyridine rings.
For CC biochar, various bands in the spectra were identified representing stretches due to alcohol and phenol-OH (3600-3200 [cm.sup.-1]; 1100-1000 [cm.sup.-1]), carboxylic acid (3000-2500 [cm.sup.-1]), alkynes (2260-2100 [cm.sup.-1]), nitrile C[equivalent to]N (2277 [cm.sup.-1]), aliphatic C-H (1470-1455 [cm.sup.-1]), and alkenes (1000-675 [cm.sup.-1]).