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单词 olefin
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Examples ofolefin

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Note the addition of a restrainingolefin(double bond) bridge in (g).
From theCambridge English Corpus
The chemoselective ruthenium-catalysedolefinmetathesis reaction was used to 'staple' together the two alkene tethers to provide peptides that maintain helical structure, but with enhanced stability.
From theCambridge English Corpus
This model seems to be valid despite substitution on theolefin.
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Furthermore, with the exception noted above, a given dialkyl tartrate will preferentially add to the same face independent of the substitution on theolefin.
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Olefinis abrasion, stain, sunlight, fire, and chemical resistant.
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Approaches to this synthesis are diverse, and include central steps such as annululation,olefinmetathesis, radical cyclization, and trapping reactions.
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Terminal olefins are converted to the corresponding alkyl bromides and alkyl iodides by treating the organoborane intermediates with bromine or iodine.
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Trisubstituted olefins can rapidly produce dialkyl boranes, but further alkylation of the organoboranes is slowed because of steric hindrance.
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These electron-donating groups make theolefinnucleophilic enough to attack electrophilic initiators or growing polymer chains.
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Enones, or electron-poor olefins, were discovered to react via a radical-anion pathway, utilizing diisopropylethylamine as a transient source of electrons.
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It may contain higher concentrations of olefins, oxygen, and nitrogen than conventional crude oil.
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They are also known as thiiranes,olefinsulfides, thioalkylene oxides, and thiacyclopropanes.
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The configuration of theolefinis retained in the cycloaddition product.
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Moreover, few unwanted by products are formed, such as olefins.
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The simplest type of molecules which exhibit allylic strain are olefins.
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It is generally believed that vinyl iodide can not survive common reduction conditions, which reduces the vinyl iodide to anolefinor unsaturated alkane.
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The reverse ofolefininsertion into a metal-hydrogen bond is -hydride elimination.
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Some of these materials are cotton, wool, nylon, acrylic, polyester, olefins, (such as polypropylene), or spandex.
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Prior to entering the reaction section, theolefinand isobutane feed are treated in a coalescer to remove water, sulfur and other contaminants.
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For example, usingolefinpolymerization catalysts, copolymers can be formed with ethylene or styrene by polymerizing only the norbornene double bond.
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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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更新时间:2024/12/28 6:57:06