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AA'BB acid and base-catalyzed acid dissociation constants acid-catalyzed deuteration Acidic D20 acidic solution alkaline D20 alkaline solutions aminocarboxylate chelates assigned base-catalyzed deuteration become deuterated broad peaks catalysis Chem chemical shifts cis isomer cis-HP Co(III Co(III)CyDTA complex cyclohexane CyDTA D(acid D(base degree of stereospecificity determined dihedral angle dmen and deen doublet EDDA enol equation equilibrium ethylenediamine backbone field proton Figure 1(b half-width high field highest field interconversion isomer kcal/mole kinetic line width low field MAGNETIC RESONANCE STUDIES mechanism methyl groups methyl resonance methylene N-H protons N-H resonance N,N'-dimethylpiperazine nitrogen inversion rate Nmr spectra nmr tubes NUCLEAR MAGNETIC RESONANCE obtained OC Hydrogen Atoms pattern pD values ppm vs TMS proton exchange rates rapid rate constants reaction ring inversion shown in Figure singlet spectrum split t-HP+ Terrill and Reilley trans trans-HgP trans-trans conversion undergo upfield various temperatures various values water molecules yielded a slope