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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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Journal ArticleDOI
TL;DR: New reaction conditions and stereochemical control elements for heterodimerization between ethylene (or propylene) and functionalized vinyl arenes are highlighted in this article, where an enantioselective version of the hydrovinylation reaction uses [{(allyl)NiBr}2], a noncoordinating counter anion, (bis-CF3−C6H3)4B−, and a hemilabile ligand such as MOP.
Abstract: New reaction conditions and stereochemical control elements for heterodimerization between ethylene (or propylene) and functionalized vinyl arenes are highlighted (see equation). For example, an enantioselective version of the hydrovinylation reaction uses [{(allyl)NiBr}2], a noncoordinating counter anion, (bis-CF3−C6H3)4B−, and a hemilabile ligand such as MOP. Other applications include intramolecular cyclization of 1,6-dienes and heterodimerization of norbornene and ethylene.

51 citations

Journal ArticleDOI
TL;DR: In this paper, the polymerization behavior of a new series of palladium(II) pre-catalysts in the vinyl-polymerization of norbornene has been investigated.
Abstract: The polymerization behaviour of a new series of palladium(II) pre-catalysts in the vinyl-polymerization of norbornene has been investigated. Compounds containing [PdCl4]2− or [Pd2Cl6]2− anions and the organic cations [K(18-crown-6)]+, [H3O(18-crown-6)]+, [Ph3PCH2C(O)CH3]+ or [Him]+ (im = imidazole) can be activated with the Lewis acids methylalumoxane (MAO), tris(pentafluorophenyl)borane, B(C6F5)3 or a combination of B(C6F5)3/triethylaluminum (TEA). The catalytic systems show very high norbornene polymerization activities of up to 107 gpolymer molPd−1 h−1. In the case of an activation with B(C6F5)3 alone it is possible to obtain soluble palladium-catalyzed poly(norbornene)s which exhibit a fully saturated polymer backbone and a molar mass (Mn) between 8 × 103 and 3 × 105 g mol−1. The activation process of the pre-catalyst [Ph3PCH2C(O)CH3]2[Pd2Cl6] (2C) in combination with B(C6F5)3 can be followed by multinuclear (1H, 13C, 19F and 31P) NMR investigations and points to the in situ formation of PdCl2 which then represents the active species for the polymerization process. The X-ray structure of compound 2C is reported.

51 citations

Journal ArticleDOI
TL;DR: In this paper, the polymerization of polynorbornene to poly (2,3-bicyclo [2.2.1] hept-2-ene) [poly (norbornene) was investigated.
Abstract: Nickel (salen) in conjunction with methylaluminoxane (MAO) catalyzes the polymerization of norbornene to poly (2,3-bicyclo [2.2.1] hept-2-ene) [poly (norbornene)]. Methylaluminoxane (MAO) was used as cocatalyst as such (MAO-I) and after distilling off free trimethylaluminium (MAO-II). The catalyst system was very active in chlorobenzene at room temperature. It was also found that MAO-II gave higher activity as compared to MAO-I. The samples of polynorbornene were soluble in 1,2,4-trichlorobenzene. The poly (norbomene)s were characterized by intrinsic viscosity and thermal properties.

50 citations

Journal ArticleDOI
TL;DR: The living ring-opening metathesis polymerization (ROMP) of cyclobutene has been used to synthesize near monodispersed linear polyethylene as discussed by the authors.
Abstract: Near monodispersed linear polyethylene can be synthesized y hydrogenation of polybutadiene prepared by the living ring-opening metathesis polymerization (ROMP) of cyclobutene. The polyethylene is highly crystalline, as determined by powder X-ray diffraction, and defect free, as shown by spectroscopic data. Living polycyclobutene can also react with anthracene dialdehyde to give a labeled polymer and with norbornene to produce a block copolymer.

50 citations

Journal ArticleDOI
TL;DR: In this paper, a commercial norbornyl-functionalized linseed oil, blended with a bicyclic norbornene-based crosslinking agent, undergoes ring-opening metathesis polymerization with the 1st generation Grubbs' catalyst to form a biorenewable polymer network.
Abstract: A commercial norbornyl-functionalized linseed oil, blended with a bicyclic norbornene-based crosslinking agent (at loadings ranging from 0 to 50 wt %) undergoes ring-opening metathesis polymerization with the 1st generation Grubbs' catalyst to form a biorenewable polymer network. Comonomers are characterized, the thermal and mechanical properties of the cured systems are investigated by dynamic mechanical analysis, and thermal decomposition is evaluated by thermogravimetric analysis. The resin is shown to consist of a modified linseed oil and small oligomers of cyclopentadiene. Broad tan δ peaks suggest inhomogeneous phase morphologies, which result in complex crosslinking behaviors. The thermal stability of the polymers increases with increasing crosslinker content.

50 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202376
2022165
2021113
2020119
2019141
2018136