Topic
Steric effects
About: Steric effects is a research topic. Over the lifetime, 16112 publications have been published within this topic receiving 319615 citations. The topic is also known as: steric hindrance.
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TL;DR: Porous microparticulate zirconium oxide shows very different selectivities and pH dependencies for the separation of benzoic acid derivatives than do conventional bonded-phase anion-exchange supports.
Abstract: Porous microparticulate zirconium oxide shows very different selectivities and pH dependencies for the separation of benzoic acid derivatives than do conventional bonded-phase anion-exchange supports This results from a very significant ligand-exchange contribution to the retention of hard Lewis bases on the surface of transition-metal oxide supports We have found that the capacity factors of a wide variety of derivatives of benzoic acid are closely correlated with their Bronsted acidities The eluent pH is also a critical factor in determining the magnitude of the capacity factor, but it does not have much influence on chromatographic selectivity The differential selectivity of this phase in comparison to conventional polymeric and bonded-phase anion exchangers can be attributed to complexation and steric effects which profoundly alter the elution patterns of certain solutes
67 citations
TL;DR: The results indicate that a subtle variation in the substitution pattern has a profound influence on the photophysical and DNA interactions and demonstrate that pi-stacking interactions of the ligand with DNA are essential for efficient electron transfer between the DNA bases and the ligands.
67 citations
67 citations
TL;DR: The methyl groups in TetMe-IBX lower the activation energy corresponding to the rate-determining hypervalent twisting, and the steric relay between successive methyl groups twists the structure, which manifests in significant solubility in common organic solvents.
Abstract: The methyl groups in TetMe-IBX lower the activation energy corresponding to the rate-determining hypervalent twisting (theoretical calculations), and the steric relay between successive methyl groups twists the structure, which manifests in significant solubility in common organic solvents. Consequently, oxidations of alcohols and sulfides occur at room temperature in common organic solvents. In situ generation of the reactive TetMe-IBX from its precursor iodo-acid, i.e., 3,4,5,6-tetramethyl-2-iodobenzoic acid, in the presence of oxone as a co-oxidant facilitates the oxidation of diverse alcohols at room temperature.
67 citations
TL;DR: A number of 2-aryl substituted 6-pyrrolidino-4(3H)-quinazolinones were synthesized in four steps starting from commercially available 5-chloro-2-nitrobenzoic acid.
Abstract: A number of 2-aryl substituted 6-pyrrolidino-4(3H)-quinazolinones are reported. They were synthesised in four steps starting from commercially available 5-chloro-2-nitrobenzoic acid. The key cyclis...
67 citations