Solid-State and Solution Conformation of N-tert-Butyloxycarbonyl-L-prolylglycine

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Abstract
The occurrence of the oxy analogue in the trans-II 4 leads to 1 intramolecularly hydrogen-bonded nonhelical peptide conformation, recently proposed for t-BOC-L-Pro-Gly-OH in the solid state on the basis of infrared absorption evidence, has been disproved by x-ray diffraction analysis. This type of folding is also absent in polar solvents. However, in solvents of low polarity the presence of this folded form cannot be excluded.

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