Nuclear Magnetic Resonance Studies of Dynamic Exchange Processes in N,N'-dimethylpiperazine Hydrochlorides and in Ethylenediamine-N,N'-diacetatocobalt (III) Chelates |
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55 LOS ANGELES AA'BB acid dissociation constants acid-catalyzed deuteration acidic D₂O acidic solution ALOS ANGELES ANGELES 50 ANGELES OF CALIFORN ANGELES THE LIBRARY ANGELES THE UNIVERSITY base-catalyzed deuteration broad peaks CALIFORN 55 CALIFORN OF CALIFORN CALIFORN THE LIBRARY CALIFORN THE UNIVERSITY catalysis CH₂ chelates Chem chemical shifts cis-H₂p+2 cis-HP Co(III Co(III)CyDTA complex COYH COYHAHB cyclohexane CyDTA degree of stereospecificity determined dihedral angle doublet downfield EDDA EDDA)(dmen enol equation ethylenediamine H₂p+2 half-width HNO3 hydrogen atoms interconversion K₁ k₂ kcal/mole KD(acid KD(base line width methyl groups methyl resonance methylene N-methyl N,N'-dimethylpiperazine nitrogen inversion rate Nmr spectra nmr tubes NUCLEAR MAGNETIC RESONANCE obtained pattern pD values ppm vs TMS proton exchange rates rate constants reaction shown in Figure singlet spectrum of trans-[Co(III stereospecificity steric t-BuOH t-H₂p+2 t-HP t-HP+ trans trans-H₂p+2 trans-trans conversion UNIVERSIT OF CALIFORN UNIVERSITY 55 UNIVERSITY LOS ANGELES various values water molecules x-hydrogen