Solution conformations of 2-amino-1-hydroxy-2-aryl ethylphosphonic acids and their diethyl esters
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Add time:08/03/2019 Source:sciencedirect.com
Conformations of 2-amino-1-hydroxy-2-aryl ethylphosphonic acids (in D2O) and their diethyl esters (in CDCl3 and CD3OD) were determined by means of NMR on the basis of dependence between observed values of coupling constants (3JPC, 3JHH and 3JPH) and corresponding dihedral angles. In case of diethyl esters we observed that the conformation was stabilised by the formation of the intramolecular hydrogen bond between (NH2)⋯(OH) moieties in both solvents, whereas for acids formation of hydrogen bond between NH3+⋯PO groups predominates.
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