Reference of 108-47-4, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.108-47-4, Name is 2,4-Dimethylpyridine, molecular formula is C7H9N. In a Article£¬once mentioned of 108-47-4
Substituent Effects in Various Alkyl Derivatives of 9aH-Quinolizine-1,2,3,4-tetracarboxylate Studied by 13C NMR Spectroscopy and X-Ray Analysis
The 13C NMR spectra of 22 alkyl-substituted 9aH-quinolizine-1,2,3,4-tetracarboxylates have been obtained and X-ray analyses have been performed for three of them.The chemical shift differences between the parent 9aH-quinolizine and the methyl-substituted compounds can only be interpreted in terms of the usual alpha and beta effects for 8-methyl-9aH-quinolizine. 6-, 7-, 9-, and 9a-methyl substituents cause not only a very large deshielding of the carbon at the position of substitution together with shielding changes at adjacent atoms, but also influence the shieldings of the other carbons in both rings of the compounds under study.The observed changes are interpreted in terms of steric hindrance between the methyl groups of ring B and the ester groups of ring A, and hyperconjugative effects introduced by the methyl groups.
A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 108-47-4
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Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis¡ªI. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis