Topic
Norbornene
About: Norbornene is a research topic. Over the lifetime, 5628 publications have been published within this topic receiving 104495 citations. The topic is also known as: norbornylene & norcamphene.
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TL;DR: In this article, a small degree of polarization of the π-olefin-Pd bond in the transition state for the σ-allyl migration is interpreted in terms of the polarization of a σallylic carbon atom from Pd to the coordinated olefin in a concerted cis-exo addition of PdC across the double bond.
37 citations
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TL;DR: In this article, polynorbornadiene and polynorbornene were synthesized via ring opening metathesis polymerization (ROMP) with [RuCl 2 (PPh 3 ) 2 (amine)] as catalyst precursors, amine=piperidine ( 1 ) or perhydroazepine ( 2 ) in the presence of 5μL of EDA.
Abstract: Polynorbornadiene and polynorbornene were synthesized via ring opening metathesis polymerization (ROMP) with [RuCl 2 (PPh 3 ) 2 (amine)] as catalyst precursors, amine = piperidine ( 1 ) or perhydroazepine ( 2 ) in the presence of 5 μL of ethyl diazoacetate (EDA) ([monomer]/[Ru] = 5000; 40 °C with 1 ; 25 °C with 2 ). The effects of the solvent volume (2–8 mL of CHCl 3 ), reaction time (5–120 min) and atmosphere type (argon and air) on the yields were investigated to observe the behavior of the two different precursors. Quantitative yields were obtained for 60 or 120 min regardless of the starting volumes, either in argon or air, with both Ru species. However, low yields were obtained for short times (5–30 min) when the reactions are performed with large volumes (6–8 mL). In argon, the yields were larger with 2 , associated to a faster propagation reaction controlled by the Ru active species. In air, the yields were larger with 1 , associated to a higher resistance to O 2 of the starting and propagating Ru species. The different activities between 1 and 2 are discussed considering the steric hindrance and electronic characteristics of the amines such as ancillary ligands and their arrangements with PPh 3 and Cl − ions in the metal centers.
37 citations
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TL;DR: In this article, N-Cyano- and N-(methylsulfonyl)alkoxycarbimidoyl)nitrenes, generated in situ from the corresponding azides by 300-nm UV light, convert a variety of olefins cleanly and stereospecifically to the corresponding Aziridines.
Abstract: (N-Cyano- and N-(methylsulfonyl)alkoxycarbimidoyl)nitrenes, generated in situ from the corresponding azides by 300-nm UV light, convert a variety of olefins cleanly and stereospecifically to the corresponding aziridines. These can readily be hydrolyzed to N-unsubstituted aziridines or ring-opened to allylic isoureas. The nitrenes can also be generated by thermolysis at 80{degree}C. The azides add to norbornene to give triazolines, which lose nitrogen to give the exo-aziridines.
37 citations
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TL;DR: In this article, a series of polynorbornene homopolymers and block copolymers containing side-chain amidoferrocenyl groups and tetraethylene glycol linkers were prepared via living ring-opening metathesis polymerization initiated by Grubbs' third-generation catalyst.
37 citations
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TL;DR: In this paper, the gas transport and sorption properties of a series of cyclic olefin copolymer (COC, Topas®) membranes containing 40−66 mol% norbornene were investigated.
37 citations