Steric and Electronic Effects on an Antibody-Catalyzed Diels-Alder Reaction, ArtículoA series of substituted thiophene dioxides was tested as diene substrates for the antibody 1E9, which was elicited with a hexachloronorbornene derivative and normally catalyzes the inverse electron-demand Diels–Alder ...
The first relationship took the form 1 : Open image in new window where k bi is the observed overall rate constant for the reaction, k f is the rate constant for the formation of the activated complex, C 1 is a constant and P rs the mobile bond order 2 between the atoms r and s ...
In the absence of varying steric effects an excellent additive relationship is found between the electronic effects of the substituents and the position of the first electronic absorption band. Conformational changes brought about by crowding substituents are detected by an increase in intensity of the ...
In order to study electronic and steric effects on (103Rh), the 103Rh-NMR spectra of a series of [Rh(cod)L2] complexes (with L = nitrogen, oxygen, or chloride) have been measured by gradient-enhanced HMQC (1H,103Rh) NMR spectroscopy. Density functional computations of representative exampl...
Steric and Electronic Effects on the Configurational Stability of Residual Chiral Phosphorus-Centered Three-Bladed Propellers: Tris-aryl Phosphane Oxides (2013). Steric and electronic effects on the configurational stability of residual chiral phosphorus-centered three-bladed propellers: tris-aryl phosphane...
Conformational, steric and electronic effects on the site- and chemoselectivity of the metal-catalyzed reaction of N-bis(trimethylsilyl)methyl, N-(2-indoly... G. H. Wee, "Conformational, steric and electronic effects on the site- and chemoselectivity of the metal-catalyzed reaction of N-bis(...
The effects of introducing ionic functionalities in phosphine ligands on the coordination chemistry of these ligands and the catalytic behavior of the corresponding metal complexes are reviewed. The steric and electronic consequences of such functionalizations are discussed. Apart from these steric and elec...
1) electronic and steric effects 电子和空间效应2) photoelectron interference effect 光电子空间干涉效应3) Space-charge effect 空间电荷效应 1. The phenomenon could be explained in view of the space-charge effect. 这种现象可由空间电荷效应来解释。 2. Based on space-charge effect,I choose ...
The electronic and steric effects of chiral biaryl diphosphine ligands on the Rh(I)-catalyzed asymmetric Pauson–Khand type reaction were examined. We demonstrated that enantioselectivity and reaction yield were influenced by the electronic density on phosphorus, the dihedral angle of ligands and the ...
Electronic and steric factors affecting the formation of four or five-coordinated aluminum complexes: syntheses and crystal structures of some aluminum alk... Electronic and steric factors affecting the formation of four or five-coordinated aluminum complexes: syntheses and crystal structures of some ...