Conformational analysis of hydroxyproline and its protected derivatives by 1H NMR

Ramakrishna, J (1985) Conformational analysis of hydroxyproline and its protected derivatives by 1H NMR. In: Spectrochimica Acta Part A: Molecular Spectroscopy, 41 (10). pp. 1229-1233.

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Abstract

From a computer simulation of the 270 MHz 1H NMR spectra of hydroxyproline (Hyp) and its protected derivatives, precise values of ring vicinal coupling constants were obtained. These couplings were related to ring torsional angles, using a Karplus type analysis. From the NMR analysis it was observed that the pyrrolidine ring possesses a unique and highly homogeneous conformation (Cγ-exo form). Temperature dependence studies on protected dipeptides suggest that the pyrrolidine ring conformation is independent of backbone conformation. An unusual X-Hyp, β-turn was observed for Boc-Aib-Hyp-NHMe.

Item Type:	Journal Article
Publication:	Spectrochimica Acta Part A: Molecular Spectroscopy
Publisher:	Elsevier Science
Additional Information:	The copyright of this article belongs to Elsevier Science
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	29 May 2009 10:14
Last Modified:	19 Sep 2010 05:32
URI:	http://eprints.iisc.ac.in/id/eprint/20268

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