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 origin of the observed nonplanarity of the syn-sesquinorbornene (syn-tetracyclo-[6.1.1 3,6.0 2,7 ]dodec-2(7)-ene) π system is discussed in this article in terms of simple molecular orbital theory.
46 citations
TL;DR: In this paper, aryloxide-NHC-ligated nickel complexes 2−5 were determined by single-crystal X-ray diffraction analysis, and the same complexes were obtained with the same pro-ligands/Ni ratio of 1:1 or 2:1.
46 citations
TL;DR: In this article, the Ni(II) and copper (II) complexes bearing 2′-(4′,6′-di-tert-butylhydroxy-phenyl)-1,4,5-triphenyl imidazole ligand have been synthesized and characterized.
46 citations
TL;DR: A catalytic system of new titanium complexes with methylaluminoxane (MAO) was found to effectively polymerize ethylene for high molecular weight polyethylene as well as highly active copolymerization of ethylene and norbornene as mentioned in this paper.
Abstract: A catalytic system of new titanium complexes with methylaluminoxane (MAO) was found to effectively polymerize ethylene for high molecular weight polyethylene as well as highly active copolymerization of ethylene and norbornene. The bis (imino-indolide)titanium dichlorides (L2TiCl2, 1–5), were prepared by the reaction of N-((3-chloro-1H-indol-2-yl)methylene)benzenamines with TiCl4, and characterized by elemental analysis, 1H and 13C NMR spectroscopy. The solid-state structures of 1 and 4 were determined by X-ray diffraction analysis to reveal the six-coordinated distorted octahedral geometry around the titanium atom with a pair of chlorides and ligands in cis-forms. Upon activation by MAO, the complexes showed high activity for homopolymerization of ethylene and copolymerization of ethylene and norbornene. A positive “comonomer effect” was observed for copolymerization of ethylene and norbornene. Both experimental observations and paired interaction orbital (PIO) calculations indicated that the titanium complexes with electron-withdrawing groups in ligands performed higher catalytic activities than those possessing electron-donating groups. Relying on different complexes and reaction conditions, the resultant polyethylenes had the molecular weights Mw in the range of 200–2800 kg/mol. The influences on both catalytic activity and polyethylene molecular weights have been carefully checked with the nature of complexes and reaction conditions. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 3415–3430, 2007
46 citations
TL;DR: In this article, the authors describe a cascade of tandem metathesis reactions when treated with Grubbs' catalyst, resulting in dienes which can be trapped in situ by dienophiles in Diels-Alder reactions to yield polycyclic compounds.
46 citations