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词汇 double-bond
释义 double bond
noun[ C ]
 chemistry specializeduk /ˌdʌb.əl ˈbɒnd/ us /ˌdʌb.əl ˈbɑːnd/
a chemical bond in which a molecule has two shared pairs of electrons双键(两个原子间以两对共享电子构成的化学键)
SMART Vocabulary: related words and phrases

Chemistry - general words
acceptor
aerosol
aerosolize
allotrope
amphiprotic
balanced equation
chemical equation
electrolyte
endocrine disruptor
endothermic
epitaxial
epitaxially
epitaxy
ionic bond
latent heat
nonchemical
nonelectrolyte
nonreactive
preatomic
reactive

Examples of double bond


double bond
This doublebond is located between the fourth and fifth carbon atoms of the 18-carbon sphingoid base.
Note the addition of a restraining olefin (doublebond) bridge in (g).
It is initiated by free-radical attack upon a lipid, resulting in the removal of a hydrogen atom from a methylene group adjacent to a doublebond.
Saturated cyclic compounds contain single bonds only, whereas aromatic rings have an alternating (or conjugated) doublebond.
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This compound features a rare example of a stable, unhindered carbon-selenium doublebond.
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They have a long and flexible chain between the onium heads, except for the doublebond of mivacurium.
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Each contains one doublebond within its molecular structure.
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The compound is deprotonated on one side and protonated on another side, whereas a single bond and a doublebond are exchanged.
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Each doublebond has two additional localized electrons, while each triple bond has four additional electrons (two pairs) between the bonded atoms.
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Oxidation at the doublebond occurs slowly in air, and is known as rancidification in foodstuffs or drying in coatings.
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The overall transformation is the conversion of the carbonsulfur bonds to a carboncarbon doublebond.
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Due to the nature of elimination, it can be applied to both small rings, and large rings containing a doublebond.
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The aldehydic carbon-oxygen doublebond can also be subject to hydroformylation, which leads to formic acid and its esters.
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These materials exist as "cis" or "trans" isomers depending on the geometry of the doublebond.
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Alkenes with a thiol group on both sides of the doublebond are called enedithiols.
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See all examples of double bond
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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