| 单词 | alkyne |
| 释义 | alkyne noun[C] chemistryspecializeduk/ˈæl.kaɪn/us/ˈæl.kaɪn/anunsaturatedcompoundofhydrogenandcarbon(= one that does notcontainthegreatestpossiblenumberofhydrogenatoms)that has at least onetriplebond, forexampleacetylene 炔，炔烃Chemistry: types of chemical
Examplesofalkynealkyne All reactions proceed via an initial addition of the radical to alkenes, alkynes and aromatic species. From theCambridge English Corpus Alternatively, acetylene may yield amino acids directly via a conversion of analkyneto the corresponding aldehyde, which then forms an alpha amino nitrile and eventually an amino acid. From theCambridge English Corpus Additionally, this compound can by produced through the hydration of analkynethrough mecuric sulfate catalysis. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.Using a protectedalkyne, as opposed to acetylene gas, prevents further (undesired) coupling reactions and also has the benefit of being a liquid. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The four main categories are (1) nucleophilic attack on an alkenealkyne, or allyl ligand and (2) insertion of the alkene into the metal-amide bond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Usually, the substrate is an alkene or analkyne. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The reaction shown below involves analkyneoxymercuration reaction to generate the requisite ketone. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.In the first step of this reaction, a metal acetylide is formed by reaction of the terminalalkynewith the copper salt. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.In the uncatalysed reaction thealkyneremains a poor electrophile. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The proton transfer leads to intermediate 4, which undergoes the key fragmentation toalkyne(6) and the corresponding carbonyl compound (7). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Alkenylalanes, which are easily synthesized with complete stereocontrol throughalkynehydroalumination, transfer the alkenyl unit to a variety of electrophiles. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.It is composed of bothalkyneand alkene groups. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Molecules called ene-diynes feature a ring containing an alkene (ene) between twoalkynegroups (diyne). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The most problematic side products of the reaction are due to cyclotetramerization (leading to cyclooctatetraenes) andalkynedimerization (leading to enynes). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The conjugatedalkyneis reduced to the methyl ester. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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