Abstract
Five amino acids with known configuration: α- and β-3-amino-tropane- and 3-amino-bicyclo(3.2.1)octane-3-carboxylic acids and α -3-amino-granatane-3-carboxylic acid have been studied by i.r. and 1H NMR spectroscopy. Both α- and γ-zwitterion structures have been found for tropane and granatane amino acids. Equatorial and axial ammonium groups in α-zwitterions can be distinguished by the number and frequencies of the ammonium deformation modes. A chair—boat conformation has been deduced for α-3-amino-granatane-3-carboxylic acid.
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