
Enyne - Wikipedia
An enyne is an organic compound containing a C=C double bond (alkene) and a C≡C triple bond (alkyne). [1] . It is called a conjugated enyne when the double and triple bonds are conjugated. The term is a contraction of the terms alk en e and alk yne. The simplest enyne is vinylacetylene. [2] The organic enyne is isanolic acid.
有机人名反应——烯炔复分解(Enyne Metathesis) - 知乎
分子间的反应称为交叉烯炔复分解(Cross-Enyne Metathesis),而分子内反应称为闭环烯炔复分解(Ring-Closing Enyne Metathesis,RCEYM)。 烯炔复分解,或所谓的环异构化反应,首先报道了使用钯(II)和 铂(II)盐,并且在机理上不同于金属卡宾介导的途径。 由于 钌卡宾 是目前在烯烃复分解和烯炔键重组中的首选催化剂,因此我们将重点介绍这一类催化剂。 钌卡宾是可商购的,可耐受许多官能团,并且在不断开发新的催化剂。 在引发步骤中,稳定的催化剂经历环加 …
烯炔复分解反应 (Enyne metathesis) - 化学空间 Chem-Station
2014年10月24日 · 烯烃-炔烃之间的复分解反应用于合成1,3-二烯的合成方法。 通常该反应使用Grubbs第一代or第二代催化剂进行催化反应。 由于该反应是结合再重排的形式所以原子经济性可以达到惊人的100%,是十分优异的反应之一。 与烯烃复分解以及炔烃复分解反应一样, 分子内闭环烯炔复分解 同样也是十分有用的反应。 此类反应一般在乙烯气体下进行反应。 虽然对于分子间的交叉复分解反应也同样适用,但是其中化学选择性・位置选择性・几何异构等诸多问题目前来 …
Regioselective, catalytic 1,1-difluorination of enynes
2023年10月16日 · Here we demonstrate that enynes are competent proxies for styrenes, thereby mitigating the recurrent need for aryl substituents, and enabling highly versatile homopropargylic difluorides to be...
Zhang enyne cycloisomerization - 化学空间 Chem-Station
2017年1月19日 · 在铑催化剂作用下烯炔化合物可以发生环化异构化反应,此反应被称作Zhang enyne cycloisomerization。 该反应可以方便的实现烯烃和炔烃分子内的不对称环化,具有很好的区域选择性以及立体选择性,高效地构筑一系列五元环化合物。
Enyne Metathesis - Organic Chemistry Portal
The Enyne Metathesis is a ruthenium-catalyzed bond reorganization reaction between alkynes and alkenes to produce 1,3-dienes. The intermolecular process is called Cross-Enyne Metathesis, whereas intramolecular reactions are referred as Ring-Closing Enyne Metathesis (RCEYM).
Unraveling Enyne Bonding via Dehydrogenation–Hydrogenation …
2024年4月15日 · It is proposed that enyne formation initiates with a direct carbon–carbon coupling between two alkyne groups, followed by surface-assisted dehydrogenation-hydrogenation processes. Thereby consecutive steps of atomic hydrogen cleavage, surface migration and recombination to a different carbon atom enable bridging via carbon–carbon double ...
Enyne - an overview | ScienceDirect Topics
An enyne is a compound that exhibits a spectrum similar to a diene and is characterized by a shoulder at approximately 235 mμ in its spectrum. It is often distinguished by its infrared and n.m.r. spectra as well.
Mechanism of Enyne Metathesis Catalyzed by Grubbs …
2005年4月27日 · The alkyne insertion step and the cycloreversion of 2-vinyl ruthenacyclobutanes feature comparable predicted overall barriers in intermolecular enyne metathesis. For intramolecular enyne metathesis, a noncyclic alkene fragment of the enyne substrate is first incorporated into the Grubbs catalyst by an alkene metathesis reaction.
On-surface synthesis of enetriynes - Nature Communications
2023年3月6日 · Our study introduces an integrated strategy for the precise fabrication of functional enetriyne species, thus providing access to a distinct class of highly conjugated π-system compounds. Enynes...