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The 15N NMR chemical shifts of ten substituted pyridines (B) and their complexes with trifluoroacetic acid (AHB) were measured at the natural abundance level in dichloromethane.The plot of the relative chemical shifts against DeltapKa gives a titration curve which reflects a protometric equilibrium AH…B ->/<- A-...HB+.These data were used to determine the constants of the overall proton transfer reaction (Kexp).A linear relationship holds between log Kexp and DeltapKa. Deltadelta(15N) values can be treated as a good hydrogen bond parameter.KEY WORDS: 15N NMR spectroscopy, Hydrogen bond, Proton transfer, Pyridines
In conclusion, we affirm that quantitative kinetic descriptions of catalytic behavior continue to serve as an indispensable tool to navigate research efforts intended to model. If you are interested in 108-47-4, you can contact me at any time and look forward to more communication. Recommanded Product: 2,4-Dimethylpyridine
Reference：
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis