Topic
Norbornadiene
About: Norbornadiene is a research topic. Over the lifetime, 2389 publications have been published within this topic receiving 38603 citations.
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TL;DR: In this paper, poly(1a) was found to be composed of a cis structure in the main chain by NMR analysis, while poly (1d) contained both cis and trans structures in the helical main chain without showing significant CD.
Abstract: Monosubstituted aliphatic acetylenes such as cholesteryl 3-butynyl carbonate (1a) and cholesteryl 6-heptynyl carbonate (1d) were synthesized and polymerized with a Rh(nbd)[C 6 H 5 ) 4 ] (nbd: norbornadiene) catalyst in tetrahydrofuran to give soluble polymers in almost quantitative yields. Poly(1a), which was found to be composed of a cis structure in the main chain by NMR analysis, showed intense circular dichroism (CD) in the UV/Vis region assigned to the π-π* transmission of the helical main chain induced by the cholesteryl side group, while poly (1d) contains both cis and trans structure in the main chain without showing significant CD. Poly(1a) was not deteriorated in air after a month, although the cis to trans isomerization was observed to take place by annealing, together with the intramolecular trimerization of the main chain.
21 citations
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TL;DR: In this article, the authors describe novel developments in the framework of the studies of sequential palladium-catalyzed reactions, involving palladacycle formation with norbornene or norbornadiene via aromatic C-H activation.
21 citations
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TL;DR: In this article, Copolymerization of ethylene with a symmetrical diene, namely, 2,5-norbornadiene, was studied using a homogeneous metallocene/MAO catalyst system.
Abstract: Copolymerization of ethylene with a symmetrical diene, namely, 2,5-norbornadiene was studied using a homogeneous metallocene/MAO catalyst system. Copolymerizations were found to occur exclusively through one of the two equally reactive endocyclic double bonds with Cp 2 ZrCl 2 , (buCp) 2 ZrCl 2 and Et(Ind) 2 ZrCl 2 catalysts. Both double bonds are involved in the polymerization when Me 2 SiCp 2 ZrCl 2 is used as the catalyst. In the case of Et(Ind) 2 ZrCl 2 , the incorporation of the diene was found to increase with time. The extent of incorporation of the diene, molecular weight and copolymerization activity were found to depend on the nature of the catalyst.
21 citations
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TL;DR: In this article, the norbornadiene complexes [M(CO)4(pyridyl-CH=N-CHRCO2R′] were obtained by reaction of the Schiff bases from pyridine-2-carboxaldehyde and glycine, L-alanine, l-valine or L-leucine esters.
Abstract: The complexes [M(CO)4(pyridyl-CH=N-CHRCO2R′)] (M = Cr, Mo; R = H, CH3, CH(CH3)2, CH2CH(CH3)2) were obtained by reaction of the Schiff bases from pyridine-2-carboxaldehyde and glycine, L-alanine, L-valine or L-leucine esters with the norbornadiene complexes [M(CO)4(nbd)] and were characterized by IR, 1H and 13C NMR and UV-vis spectra. The deeply colored complexes exhibit solvatochromism.
21 citations
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TL;DR: The intramolecular Diels-Alder reaction of a (5′-hexynyl)cyclopentadiene provides a 1,2-tetramethylene-bridged norbornadiene which undergoes selective monohydrogenation followed by ozonolysis to provide the title compounds as mentioned in this paper.
21 citations