Topic
Substituent
About: Substituent is a research topic. Over the lifetime, 42877 publications have been published within this topic receiving 516716 citations. The topic is also known as: side chain & side group.
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TL;DR: Effet des substituants des cyclopentadienyls sur la vitesse de reaction des t-butyl-3 di-η 5 -cyclopentadiyl-1,1 diphenyl-2,3 titanacyclobutenes-2 and le dimethyl-3,3 butene-1 as discussed by the authors.
Abstract: Effet des substituants des cyclopentadienyls sur la vitesse de reaction des t-butyl-3 di-η 5 -cyclopentadienyl-1,1 titanacyclobutanes avec le diphenylacetylene pour donner des di-η 5 -cyclopentadienyl-1,1 diphenyl-2,3 titanacyclobutenes-2 et le dimethyl-3,3 butene-1
90 citations
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TL;DR: In this article, Palladium-catalyzed cyclization of α-amino allenes affords either the pyrroline or pyrrole depending on reaction conditions and provides for introduction of an aryl substituent at the C-3 position of the α-amerino allene.
90 citations
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TL;DR: By incorporating the F substituent in tetrazolate-carboxylate ligands and combining the dipyridyl co-linkers, novel Zn-MOF, [(CH3)2NH2][Zn1.5]·2DMF·2H2O (1) (F-H2tzba = 2-F-4-(1H-tetrazol-5-yl) benzoic acid, bpy = 4,4′-bipyridine), was constructed as mentioned in this paper.
Abstract: By incorporating the F substituent in tetrazolate–carboxylate ligands and combining the dipyridyl co-linkers, novel Zn-MOF, [(CH3)2NH2][Zn1.5(μ3-O)0.5(F-tzba)1.25(bpy)0.25(μ2-F)0.5]·2DMF·2H2O (1) (F-H2tzba = 2-F-4-(1H-tetrazol-5-yl) benzoic acid, bpy = 4,4′-bipyridine), was constructed. 1 was based on an unprecedented 12-connected hexanuclear cluster and formed an fcu topological framework, which contained intriguing 3D polar pores formed by intersected octahedral and tetrahedral cages with the modification using F. The framework not only showed high adsorption capacity for CO2, C2H2, and C2H6 but also exhibited excellent selective capture for CO2, C2H2, and C2H6 over CH4 and C2H2 over CO2 at 298 K. The framework as a Lewis acid heterogeneous catalyst also displayed highly efficient catalytic activity in the cycloaddition reaction of CO2 with different epoxides to produce cyclic carbonate chemicals. Grand canonical Monte Carlo simulations were studied to identify the different CO2, C2H2 and C2H6 binding sites as well as the catalytic interactions between the framework and the propylene oxide substrate. Simultaneously, the MOF could selectively adsorb the methylene blue (MB) dye from other organic dyes.
90 citations
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TL;DR: In this article, the regioselectivity of the presented effective hydrosilylations of internal alkynes is predominantly governed by electronic effects, and it is shown that the effect of electronic effects is negligible.
Abstract: The regioselectivity of the presented effective hydrosilylations of internal alkynes is predominantly governed by electronic effects.
90 citations
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TL;DR: The reason for the high selectivity in the photocatalytic oxygenation of various toluene derivatives by molecular oxygen is discussed on the basis of the photoinduced electron transfer mechanism that does not involve the autoxidation process (radical chain reactions).
Abstract: A ring-substituted toluene with an electron-withdrawing substituent, p-tolunitrile, is oxygenated by molecular oxygen to yield the corresponding aldehyde with tetrafluoro-p-dicyanobenzene as a photocatalyst under photoirradiation with an Hg lamp (λ > 300 nm). The oxygenation of a ring-substituted toluene with an electron-donating substituent, p-xylene, by molecular oxygen is also achieved with 10-methyl-9-phenylacridinium ion as a photocatalyst under visible light irradiation, yielding p-tolualdehyde exclusively as the final oxygenated product. Both the oxygenation reactions are initiated by photoinduced electron transfer from the ring-substituted toluene to the singlet excited state of the photocatalyst. The reason for the high selectivity in the photocatalytic oxygenation of various toluene derivatives by molecular oxygen is discussed on the basis of the photoinduced electron transfer mechanism that does not involve the autoxidation process (radical chain reactions). The reactive intermediates in the ph...
90 citations