| 词汇 | example_english_double-bond |
| 释义 | Examples of double bondThese 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. 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. If there are both double bonds and triple bonds, en (doublebond) is written before yne (triple bond). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The products of fragmentation methods retain a doublebond as a result, and extra synthetic steps are usually required to incorporate the chain-carrying group. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Such intermediates arise from the addition of singlet oxygen to the doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The three step reaction begins with the regioselective addition of nitrosyl chloride across the trisubstituted doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. For each of the two atoms in the doublebond, it is necessary to determine the priority of each substituent. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. As a result, only one face of the doublebond is exposed on the "exo" face of the aromatic ring. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The doublebond is then reformed, effectively discharging ribose 5-phosphate as a leaving group. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. For example, using olefin polymerization catalysts, copolymers can be formed with ethylene or styrene by polymerizing only the norbornene doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is because the benzoxazine was originally the compound with a doublebond, such as in structured. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In other unsaturated hydrocarbons, the doublebond between two carbons prevents rotation of the atoms about the bond, locking them into specific structural formations. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Radicals add rapidly to the doublebond, and the resulting -radical carbonyl is relatively stable; it can couple with another molecule or be oxidized. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It consists of a carbon atom bound by two single bonds and one doublebond, where one of the single bonds is to a hydrogen. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The ketone group was deprotected by action of tetra-n-butylammonium fluoride, and the doublebond was epoxidized with meta-chloroperoxybenzoic acid to epoxide 32. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Cyclic rearrangements include cycloadditions and, more generally, pericyclic reactions, wherein two or more doublebond-containing molecules form a cyclic molecule. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In this isomerization reaction a stable carbon-carbon doublebond is rearranged top create a highly electrophilic allylic isomer. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The doublebond of maleic anhydride forms two carboncarbon bonds on the ends of the bay region, making a new six-membered ring. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Additionally, the conjugated doublebond systems in the polymers which carry the charge, react more readily with light and oxygen. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Initial synthesis gave a racemic form of the compound using an intramolecular etherification reaction of the alcohol motifs and the doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The other doublebond connects a metal-based catalyst to a fragment of an organic molecule. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The doublebond of the attacked carbonyl reforms and the serine is then esterified to chlorophyllide. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There are two isomers of nerolidol, "cis" and "trans", which differ in the geometry about the central doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. An -attack from the nucleophile (at the position bearing the halogen) is distinguishable from a -attack (at the doublebond) by inspecting the products. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Desomorphine is derived from morphine where the 6-hydroxyl group and the 7,8 doublebond have been reduced. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The ketone carbonyl and isolated doublebond are unaffected under the conditions shown. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The product contains a new exocyclic doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. But "gem" -difluoroalkenes can react also with nucleophiles, since their carbon-carbon doublebond is electrophilically activated by the two fluorine atoms. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This doublebond is absent in the lolines, explaining the lack of hepatotoxicity of this group of compounds. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A push-pull configuration also helps to stabilize the doublebond because the carbon-carbon bond has considerably less doublebond character. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When acting on the single substrate, a molecule is eliminated and this generates either a new doublebond or a new ring. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They should not be confused with isoprenol, which is an isomer of prenol with a terminal doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These bonds may be seen as a hybrid of a single bond and a doublebond, each bond in the ring identical to every other. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It has no doublebond isomers nor stereoisomers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They are aglycone constituents of cardiac glycosides and must have at least one doublebond in the molecule. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Clostridia are the main exception; they have a novel enzyme, yet to be identified, that catalyzes the formation of the cis doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The bond order has been described as 1.4 (intermediate between a single and doublebond). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The reaction is driven by the formation of a more substituted doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alkenes with a hydroxyl group on both sides of the doublebond are called enediols. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Because the process is stepwise, the configuration of the carbon-carbon doublebond is not necessarily preserved. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Thus, the doublebond can re-form as either "cis" or "trans", of which "trans" is favored, regardless the starting material. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A doublebond may exhibit one of two possible configurations: "trans" or "cis". From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This process appears to be concerted, but either doublebond of ketenes can react. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Since it does not have a doublebond, acrylic rubber also boasts of good weatherability and ozone resistance. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Hydrogenation of the doublebond yields the saturated derivative stearic acid. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The geometry of the doublebond of the starting vinyl boronic acid is completely retained in the final product. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The partial doublebond renders the amide group planar, occurring in either the cis or trans isomers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The structure of these compounds differ only in the position of the conjugated doublebond system. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The now electron-deficient carbonyl carbon re-forms the doublebond with the oxygen. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The borohydride added hydrogen and boron to the carbon-carbon doublebond in the ethyl oleate. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. All four of these hydrocarbons have four carbon atoms and one doublebond in their molecules, but have different chemical structures. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is usually found as a mixture with isocaryophyllene (the "cis" doublebond isomer) and -humulene (obsolete name: -caryophyllene), a ring-opened isomer. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Substitution of the exocyclic doublebond is well tolerated. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Most of the common addition polymers are formed from unsaturated monomers (usually having a doublebond). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This doublebond would result in a rigid ring conformation, thereby destabilizing the molecule. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. On the exocyclic doublebond there is cis/trans-isomerism. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is of interest in chemical research as an alkene whose doublebond is strained but protected by steric hindrance. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Nearly all monomers, even saturated hydrocarbons and organic compounds without a polymerizable structure such as a doublebond, can be polymerized with this technique. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There are several isomers of hexene, depending on the position and geometry of the doublebond in the chain. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Several isomers of octene are known, depending on the position and the geometry of the doublebond in the carbon chain. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Besides the single bond, a covalent bond can be either a doublebond or a triple bond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A doublebond has one sigma plus one pi bond, and a triple bond has one sigma plus two pi bonds. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This process leaves the fragment attached to the remainder of the organic molecule with a doublebond, forming a new organic compound. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The relative preference of attack on either doublebond is governed by the electronic nature of the azides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The beta isomer exists as two stereoisomers about the geometry of its central doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Hydroboration proceeds via a four-membered transition state: the hydrogen and the boron atoms added on the same face of the doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Thus, the configuration of the doublebond is retained after loss of the silyl group. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Allylsilanes react through a conformation in which the smallest substituent on the carbon attached to silicon is essentially eclipsing the doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In this case, it is the placing of the two highest priority substituents with respect to the doublebond which matters. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Kistiakowsky and fellow researchers collected heats of hydrogenation data during gas-phase reactions of various species containing one doublebond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The molecule carries a doublebond which induces significant ring strain and significant reactivity. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Isomeric with nerol is geraniol, wherein the doublebond is trans. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Fulvenes typically react in the ring, leaving the doublebond intact. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Oxidation of the doublebond with chromic acid gave the triacid 48 as an intermediate which gave dilactone 49 in two intramolecular esterifications. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There is potential for confusion because there are different numbering systems used to describe the position of this doublebond. 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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