alkene metathesis

In der Enyn-Metathese reagieren ein Alken und ein Alkin zu einem konjugierten Dien. Die beiden Gruppen können intramolekular wie in der RCM reagieren und liefern cyclische Olefine, die eine weitere Doppelbindung in Konjugation zur Ringdoppelbindung aufweisen. Die Reaktion wird als Ringschluß-Enyne-Metathese
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. Because of the relative simplicity of olefin metathesis, it often creates fewer undesired by-products and hazardous wastes than alternative organic reactions.
Olefin Metathesis allows the exchange of substituents between different olefins - a transalkylidenation. This reaction was first used in petroleum reformation for the synthesis of higher olefins (Shell higher olefin process - SHOP), with nickel catalysts under high pressure and high temperatures. Nowadays, even polyenes with
Ring Closing Metathesis (RCM). The Ring-Closing Metathesis (RCM) allows synthesis of 5- up to 30-membered cyclic alkenes. The E/Z-selectivity depends on the ring strain. The Ru-catalysts used tolerate a variety of functional groups, but normally the molecule must have polar side chains that are able to build a template
Olefin Metathesis in Organic Synthesis. Wendy Jen. MacMillan Group Meeting. January 17, 2001. I. Well-defined alkene metathesis catalysts. II. Applications of Olefin Metathesis. A. Ring closing metathesis. B. Cross metathesis. C. Ring opening metathesis. Recent Reviews: Furstner, A. Angew. Chem. Int. Ed. 2000, 39, 3013
07.07.2015 -
19.12.2016 -
Discusses olefin (alkene) metathesis reactions. Part of an organometallic hypertext.
Metathesis in acid-base chemistry and ion exchange is well defined and simple. However, until recently, bond formation in organic reactants is difficult without the presence of catalysts. • In the past 30 years or so industry has used olefin metathesis to form alkenes into other alkenes through a variety of mechanisms.
03.01.2017 -

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