Structure of N,N'-bis(amino acids) in the solid state and in solution. A 13C and 15N CPMAS NMR study.

[摘要]：Three bis(amino acids) linked by the amino groups have been prepd. and structurally characterized. We have named them Gly-Gly, Ala-Ala and Gly-Ala (or Ala-Gly). These compds. have been characterized by NMR both in soln. and in the solid state. They exist as zwitterions with the ammonium group proximal to the carboxylate anion. In the case of corresponding to a double proton migration between two proximal tautomers.

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