| 单词 | double bond |
| 释义 | double bond noun[C] chemistryspecializeduk/ˌdʌb.əl ˈbɒnd/us/ˌdʌb.əl ˈbɑːnd/achemicalbondin which amoleculehas twosharedpairsofelectrons 双键（两个原子间以两对共享电子构成的化学键）Chemistry - general words
Examplesofdouble bonddouble bond Thisdoublebondis located between the fourth and fifth carbon atoms of the 18-carbon sphingoid base. From theCambridge English Corpus Note the addition of a restraining olefin (doublebond) bridge in (g). From theCambridge English Corpus It is initiated by free-radical attack upon a lipid, resulting in the removal of a hydrogen atom from a methylene group adjacent to adoublebond. From theCambridge English Corpus 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-seleniumdoublebond. 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 thedoublebondof mivacurium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Each contains onedoublebondwithin 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 adoublebondare exchanged. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Eachdoublebondhas 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 thedoublebondoccurs 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 carboncarbondoublebond. 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 adoublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The aldehydic carbon-oxygendoublebondcan 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 thedoublebond. 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 thedoublebondare called enedithiols. 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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