| 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） 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 bonddouble 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. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This compound features a rare example of a stable, unhindered carbon-selenium doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They have a long and flexible chain between the onium heads, except for the doublebond of mivacurium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Each contains one doublebond within its molecular structure. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The compound is deprotonated on one side and protonated on another side, whereas a single bond and a doublebond are exchanged. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Each doublebond has two additional localized electrons, while each triple bond has four additional electrons (two pairs) between the bonded atoms. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Oxidation at the doublebond occurs slowly in air, and is known as rancidification in foodstuffs or drying in coatings. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The overall transformation is the conversion of the carbonsulfur bonds to a carboncarbon doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Due to the nature of elimination, it can be applied to both small rings, and large rings containing a doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The aldehydic carbon-oxygen doublebond can also be subject to hydroformylation, which leads to formic acid and its esters. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These materials exist as "cis" or "trans" isomers depending on the geometry of the doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alkenes with a thiol group on both sides of the doublebond are called enedithiols. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. 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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