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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: In this article, a series of ansa-fluorenylamidodimethyltitanium complexes, [t-BuNSiMe2Flu]TiMe2 (1), [T-BuNsiMe2(3,6-tBu2flu), [TiNsiME2(2,7-TBuNME2FFL), and [TBuNE2(C29H36), were used for copolymerization of norbornene with propylene and 1-octene.
Abstract: Copolymerizations of norbornene with propylene and 1-octene were conducted with a series of ansa-fluorenylamidodimethyltitanium complexes, [t-BuNSiMe2Flu]TiMe2 (1), [t-BuNSiMe2(3,6-tBu2Flu)]TiMe2 (2), [t-BuNSiMe2(2,7-tBu2Flu)]TiMe2 (3), and [t-BuNSiMe2(C29H36)]TiMe2 (4; C29H36, octamethyloctahydrodibenzofluorenyl), activated by trialkylaluminum-free modified methylaluminoxane. The catalytic systems promoted random copolymerizations in a living manner regardless of the titanium complex used. The activity increased by the introduction of the tBu groups on the Flu ligand, and 4 showed the highest activity for each copolymerization. The comonomer content of the copolymers obtained was controllable in a wide range by changing comonomer feed ratio with these catalytic systems. The linear relationships were observed between the norbornene content and the glass transition temperature of the copolymer, whereas the slopes depended on the titanium complex used. The result suggested that the titanium complexes affect...

57 citations

Journal ArticleDOI
Xin Wang1, Guo-Xin Jin1
TL;DR: In this paper, the picolyl-functionalized o-carborane ligand CabNH (1; CabNH = 1-(2‘-picolyl)-o-Carborane) was prepared from the monolithium carborane LiHC2B10H10 (=LiCab) and 2-CH2ClC5H5N.

57 citations

Journal ArticleDOI
TL;DR: In this paper, two synthetic approaches are presented: reacting the NHC phosphine complex 5 with the chelating ligand or reacting the pyridinyl-alcoholatophosphine complex 3 with a free NHC ligand.
Abstract: Ruthenium alkylidene complexes bearing one NHC ligand and one chelating pyridinyl alcoholate ligand 6 are generated by exchange of a phosphine ligand. Two synthetic approaches are presented: reacting the NHC phosphine complex 5 with the chelating ligand or reacting the pyridinyl-alcoholatophosphine complex 3 with a free NHC ligand. To evaluate the properties of 6 as metathesis catalysts, ROMP experiments with the strained olefin norbornene and the less strained cyclooctene were performed at different temperatures.

57 citations

Journal ArticleDOI
Wei-Guo Jia1, Yuan-Biao Huang1, Yue-Jian Lin1, Guo-Liang Wang1, Guo-Xin Jin1 
TL;DR: In this paper, the organochalcogen ligands derived from 3-methylimidazole-2-thione/selone groups mbit (2a), mbis (2b), ebit(2c), and ebis (2d) were synthesized and characterized.
Abstract: The organochalcogen ligands (S, Se) derived from 3-methylimidazole-2-thione/selone groups mbit (2a), mbis (2b), ebit (2c), and ebis (2d) [mbit = 1,1′-methylenebis(1,3-dihydro-3-methyl-2H-imidazole-2-thione), mbis = 1,1′-methylenebis(1,3-dihydro-3-methyl-2H-imidazole-2-selone), ebit = 1,1′-(1,2-ethanediyl)bis(1,3-dihydro-3-methyl-1H-imidazole-2-thione), ebis = 1,1′-(1,2-ethanediyl)bis(1,3-dihydro-3-methyl-1H-imidazole-2-selone)] were synthesized and characterized. Mononuclear NiII complexes NiBr2mbit (3a), NiBr2mbis (3b), NiBr2ebit (3c), and NiBr2ebis (3d) were obtained by the reactions of Ni(PPh3)2Br2 with 2a, 2b, 2c, and 2d, respectively. However, when the corresponding ligands 2a, 2b, 2c, and 2d were treated with CoCl2 in thf solution CoII 1D coordination polymers (CoCl2mbit)n (4a), (CoCl2mbis)n (4b), (CoCl2ebit)n (4c), and (CoCl2ebis)n (4d) were obtained. All compounds were fully characterized by IR spectroscopy and elemental analysis. The crystal structures of 2c, 3a, 3b, 3c, 4a, 4b, and 4c were determined by X-ray crystallography. The local geometry around the nickel atom in complexes 3a–c was distorted tetrahedron with coordinated S(Se) and two Br atoms, and the organochalcogen ligands form an eight- or a nine-membered ring with the nickel atom included. The cobalt atom coordination polymers 4a and 4b coexist as left-handed and right-handed helical chains, but 4c formed a zigzag chain with a CH3CN solvent molecule taken up in the channel structure. After activation with methylaluminoxane (MAO), the nickel complexes exhibited high activities for addition polymerization of norbornene (1.42 × 108 g PNBmol–1 Nih–1 for 3a). The effects of the Al/Ni ratio, reaction temperature, and reaction time to norbornene polymerization were also investigated.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

57 citations

Journal ArticleDOI
TL;DR: In this paper, the Grubbs−Hoveyda-type complexes with ferrocenyl- or −NEt2-substituted NHC ligands were synthesized according to standard procedures.

57 citations


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