MULTINUCLEAR, VARIABLE-TEMPERATURE NMR STUDY OF HYDROGEN BONDING IN TWO ORTHO-MANNICH BASES

摘要

~1H and ~(13)C NMR data for 2-diethylaminomethyl-3,4,6-tri- and -tetrachlorophenols in CH_2Cl_2 solutions at a variety of temperatures are reported. The results are consistent with intramolecular hydrogen bonding and proton transfer as shown in the structure 3. Concentration dependence of the NMR data for the perchloro compound shows an additional hydrogen bonding process attributed to the solute self-association. The ~1H, ~(13)C and ~(15)N NMR data support the proposed proton transfer structure.