Polynorbornene by Coördination Polymerization<sup>1</sup>

Truett, W. L.; Johnson, D. R.; Robinson, I. M.; Montague, B. A.

doi:10.1021/ja01494a057

Cited by 194 publications

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“…Obwohl die Entdeckung der Olefinmetathese [1,2] über vier Jahrzehnte zurück liegt, wurde die Bedeutung dieser Reaktion erst spät erkannt. Forschungsarbeiten von S C H R O C K und G R U B B S in den 90er Jahren brachten der Metathese den entscheidenden Durchbruch.…”

Section: Problemstellungunclassified

Metathese von C₅‐Olefinen im kontinuierlich betriebenen Festbettreaktor

Behr¹,

Obst

SCHüLLER

et al. 2005

Chemie Ingenieur Technik

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Ziel dieser Arbeit war die Synthese unverzweigter C8-Olefine auf der Basis von C5-Olefinen. Ausgehend von 1-Penten gelingt diese Umsetzung durch eine Metathese an heterogenen Re 2 O 7 /Al 2 O 3 -Kontakten mit einer Selektivität von 98 %. Kleine Mengen an verzweigten C5-Olefinen führen allerdings zu einer starken Absenkung dieser Selektivität. Grund hierfür sind nicht nur die Homometathesen der verzweigten C5-Olefine, sondern auch deren Kreuzmetathese mit 1-Penten.

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Section: Problemstellungunclassified

Metathese von C₅‐Olefinen im kontinuierlich betriebenen Festbettreaktor

Behr¹,

Obst

SCHüLLER

et al. 2005

Chemie Ingenieur Technik

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“…One method that has found wide application in this endeavor is olefin metathesis (OM) [1][2][3][4][5][6][7][8]. Initially viewed as a strange olefin rearrangement reaction [9,10], the utility of OM now ranges from synthetic organic chemistry [11,12] to materials chemistry [13,14]. Studies on OM have further enhanced the understanding of this process, promoting the development of interesting and useful metathesis catalysts.…”

Section: Introductionmentioning

confidence: 99%

Recent Advancements in Stereoselective Olefin Metathesis Using Ruthenium Catalysts

2017

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Olefin metathesis is a prevailing method for the construction of organic molecules. Recent advancements in olefin metathesis have focused on stereoselective transformations. Ruthenium olefin metathesis catalysts have had a particularly pronounced impact in the area of stereoselective olefin metathesis. The development of three categories of Z-selective olefin metathesis catalysts has made Z-olefins easily accessible to both laboratory and industrial chemists. Further design enhancements to asymmetric olefin metathesis catalysts have streamlined the construction of complex molecules. The understanding gained in these areas has extended to the employment of ruthenium catalysts to stereoretentive olefin metathesis, the first example of a kinetically E-selective process. These advancements, as well as synthetic applications of the newly developed catalysts, are discussed.

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“…The fascinating history of olefin (or alkene) metathesis started almost five decades ago, when Anderson and Merckling published their observation of methine exchange by scission-migration of carbon-carbon double bonds in titanium-catalyzed polymerization of norbornene [1,2]. One decade later, Banks and Bailey reported a new comproportionation reaction converting dissymmetric alkenes to symmetric counterparts through elementary disproportionation processes [3,4], what is now known as olefin metathesis.…”

Section: Introductionmentioning

confidence: 99%

Olefin Metathesis with Ru-Based Catalysts Exchanging the Typical N-Heterocyclic Carbenes by a Phosphine–Phosphonium Ylide

2017

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Density functional theory (DFT) calculations have been used to describe the first turnover of an olefin metathesis reaction calling for a new in silico family of homogenous Ru-based catalysts bearing a phosphine-phosphonium ylide ligand, with ethylene as a substrate. Equal to conventional Ru-based catalysts bearing an N-heterocyclic carbene (NHC) ligand, the activation of these congeners occurs through a dissociative mechanism, with a more exothermic first phosphine dissociation step. In spite of a stronger electron-donating ability of a phosphonium ylide C-ligand with respect to a diaminocarbene analogue, upper energy barriers were calculated to be on average ca. 5 kcal/mol higher than those of Ru-NHC standards. Overall, the study also highlights advantages of bidentate ligands over classical monodentate NHC and phosphine ligands, with a particular preference for the cis attack of the olefin. The new generation of catalysts is constituted by cationic complexes potentially soluble in water, to be compared with the typical neutral Ru-NHC ones.

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Polynorbornene by Coördination Polymerization¹

Cited by 194 publications

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Metathese von C₅‐Olefinen im kontinuierlich betriebenen Festbettreaktor

Metathese von C₅‐Olefinen im kontinuierlich betriebenen Festbettreaktor

Recent Advancements in Stereoselective Olefin Metathesis Using Ruthenium Catalysts

Olefin Metathesis with Ru-Based Catalysts Exchanging the Typical N-Heterocyclic Carbenes by a Phosphine–Phosphonium Ylide

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Polynorbornene by Coördination Polymerization1

Cited by 194 publications

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Metathese von C5‐Olefinen im kontinuierlich betriebenen Festbettreaktor

Metathese von C5‐Olefinen im kontinuierlich betriebenen Festbettreaktor

Recent Advancements in Stereoselective Olefin Metathesis Using Ruthenium Catalysts

Olefin Metathesis with Ru-Based Catalysts Exchanging the Typical N-Heterocyclic Carbenes by a Phosphine–Phosphonium Ylide

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Polynorbornene by Coördination Polymerization¹

Metathese von C₅‐Olefinen im kontinuierlich betriebenen Festbettreaktor

Metathese von C₅‐Olefinen im kontinuierlich betriebenen Festbettreaktor