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: The results of single crystal X-ray diffraction characterisation and magnetic susceptibility measurements demonstrated that nickel complexes 6a-c possess octahedral geometries around the nickel atoms with variable configurations, the Br atoms of which can be ionized when dissolved in methanol.
Abstract: A series of zinc complexes of the general formula {[ZnCl(ArNC(An)–C(An)NAr)]+}2[Zn2Cl6]2− (where Ar = 2-(1-benzyl-1H-1,2,3-triazol-4-yl)phenyl 2a, 2-(1-(1-phenylethyl)-1H-1,2,3-triazol-4-yl)phenyl 2b, 2-(1-phenyl-1H-1,2,3-triazol-4-yl)phenyl 2c; An = acenaphthene backbone) were prepared by the condensation of acenaphthenequinone with the corresponding o-triazolyl-substituted anilines (2-(1-benzyl-1H-1,2,3-triazol-4-yl)aniline 1a, 2-(1-(1-phenylethyl)-1H-1,2,3-triazol-4-yl)aniline 1b, 2-(1-phenyl-1H-1,2,3-triazol-4-yl)aniline 1c) which were formed by the copper(I)-catalyzed Huisgen[3+2] dipolar cycloaddition between 2-ethynylaniline and the corresponding azides in high yields, using anhydrous ZnCl2 as the metal template, in boiling glacial acetic acid. Zinc complexes of the type [ZnCl(ArNC(An)–C(An)NAr)]+[ZnCl3(NCCH3)]− (4a–c) were synthesized by crystallisation of the corresponding complexes 2a–c in acetonitrile, at −20 °C. After removal of zinc dichloride from complexes 2a–c by the addition of potassium oxalate, in dichloromethane, the tetradentate N,N,N,N-chelating α-diimine ligands of the type ArNC(An)–C(An)NAr (5a–c) were obtained. The new ligand precursors and zinc complexes were characterised by elemental analysis, 1H and 13C{1H} NMR spectroscopy, two-dimensional NMR spectroscopy, and X-ray diffraction. Reaction of the ligand precursors 5a–c with [NiBr2(DME)], in dichloromethane, gave nickel complexes of the type [NiBr2(ArNC(An)–C(An)NAr)] (6a–c). The results of single crystal X-ray diffraction characterisation and magnetic susceptibility measurements demonstrated that nickel complexes 6a–c possess octahedral geometries around the nickel atoms with variable configurations, the Br atoms of which can be ionized when dissolved in methanol. In preliminary catalytic tests, complexes 6a–c revealed to be active as catalysts for the polymerisation of norbornene and styrene, when activated by cocatalyst MAO. The characterisation of the polymers by 1H and 13C{1H} NMR spectroscopy, gel permeation chromatography/size-exclusion chromatography (GPC/SEC) revealed that these polymers were formed by a coordination addition mechanism.
47 citations
TL;DR: Pd/Norbornene cocatalyzed tandem C-H activation/annulation reactions of free NH-sulfoximines with aryl iodides to produce diverse polyheterocyclic sulfoximine in highly chemoselective models reported.
47 citations
Patent•
07 Sep 1976TL;DR: Methylenemalonates are prepared by reacting a substituted norbornene with an electrophilic material in the presence of a lithium amide complex and pyrolyzing.
Abstract: Methylenemalonates are prepared by reacting a substituted norbornene with an electrophilic material in the presence of a lithium amide complex and pyrolyzing. The resulting acrylates are useful as fast setting, polymerizable adhesives.
47 citations
TL;DR: In this paper, the reaction of Ni(COD)2, benzyl chloride, potassium N-(2,6-diisopropylphenyl)-2-(2.6-)propanamidate, and pyridine or 2.6-lutidine yields N,O-bound α-iminocarboxamide complexes that can be used as single-component initiators for the homopolymerization of ethylene or the copolymerization with functionalized norbornene monomers.
47 citations
TL;DR: The binuclear complex [Cp2Zr(Et)]2(μ-ethene) as mentioned in this paper was derived from the reaction of CpZrCl2 and 2 equiv of EtMgCl in THF at 0 °C.
47 citations