Olefin metathesis, or alkene metathesis, is an important process in petroleum refining and in the synthesis of important compounds such as pharmaceuticals. The mechanism of olefin metathesis is related to pericyclic reactions like Diels Alder and [2+2] reactions. In other words, it occurs through the concerted interaction of one molecule with ...

In organic chemistry, olefin metathesis is an organic reaction that entails the redistribution of fragments of alkenes (olefins) by the scission and regeneration of carbon-carbon double bonds. [1] [2] Because of the relative simplicity of olefin metathesis, it often creates fewer undesired by-products and hazardous wastes than alternative ...

烯烃复分解反应（英文名为alkene metathesis）也称作烯烃换位反应，是指在金属催化剂作用下的两个碳－碳双键的切断并重新结合的过程。 按照反应过程中分子骨架的变化，可以分为五种情况：开环复分解、开环复分解聚合、非环二烯复分解聚合、关环复分解以及 ...

2014年1月15日 · 本反应是利用催化剂金属卡宾配合物使两中不同的烯烃连接而产生新的烯烃。 因为此反应是平衡反应，要控制反应条件使平衡往生成产物的方向移动（比如除掉在反应中产生的乙烯气体）。 在1990年代， Robert H.Grubbs 发现了实用性非常高的催化剂。 之后烯烃复分解反应成为有机合成化学里最常用的反应之一。 目前实验室常用的催化是通过多次的改善而得到的。 下面是现今最常用的催化剂的反应实例。 中心金属是钼的催化剂称Schrock催化剂。 虽然反应性 …

2021年3月29日 · 金属催化的碳碳双键重新构建的反应称为烯烃复分解反应。 烯烃复分解反应有：开环复分解聚合 (ROMP)、闭环复分解聚合 (RCM)、无环二烯复分解聚合 (ADMET)、开环复分解聚合 (ROM)和交叉复分解 (CM或XMET)。 反应通式. 起源与发展. 1955年，发表了双键与双键之间重构的第一份报道，但“烯烃复分解”一词直到13年后的1968年，才由N. Calderon和他的同事提出来。 目前， 烯烃复分解反应有许多种类：开环复分解聚合 (ROMP)、闭环复分解聚合 (RCM) …

2007年2月14日 · In addition to the metathesis of strained cyclic and exocyclic olefins, the remarkable functional group tolerance (alcohols, aldehydes, carboxylic acids) and stability toward air, water,

2016年3月10日 · Simply put, olefin metathesis stitches two alkenes together. It can be done between two individual alkenes (“intermolecular” or “cross-metathesis”) but is more commonly used to form rings from a molecule containing two alkene functional groups.

2023年6月30日 · Olefin Metathesis[1] involves two olefin substrates which form a four-membered ring intermediate (first proposed by Chauvin) and then rearrange the substituents to form two new carbon-carbon double bonds. Late transition metal alkylidene compounds (eg.

Alkene metathesis reactions are gaining wide popularity in synthesizing unsaturated olefinic compounds as well as the unsaturated polymeric counterparts. Central to this catalysis is a metal carbene intermediate that reacts with olefins to give different olefinic compounds or even the unsaturated olefinic polymers depending upon the reaction ...

1998年1月1日 · Current research in alkene metathesis has two significant strands of development. One pertains to rapid progress in catalyst development which permits far greater tolerance of organic functional groups. This includes synthesis of new, structurally defined, catalytically active molecules, some of them even performing in aqueous environment.