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Theoretical-Studies On The Conformations Of Acyclic Alditols

Ranganathan, M and Rao, VSR (1981) Theoretical-Studies On The Conformations Of Acyclic Alditols. In: Current Science, 50 (1). pp. 933-936.

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The conformational analysis by energy calculation is described for some acyclic sugars such as D-glucitol, D-mannitol and galactitol. Planar Zig-zag conformation is the most favoured conformation for the three alditols. However, the energy difference between the ‘bent-chain’ and ‘straight-chain’ conformation is less in the case of D-glucitol (0.9 Kcal Mole-1)compared to those of D-mannitol (~2.4 Kcal mole-1)and galactitol (~2.5 Kcal Mole-1).The solvent accessibility studies favour bent –chain conformation for D-glucitol and straight-chain conformation for D-mannitol and glactitol. These conformations, arrived at by theorticle analysis are compared with those abseverd in the solid state determined by X=ray differaction techinique and their acetylated derivatives in solution by NMR technique. These studies suggest that, when the energy difference between straight and bent conformations is small, latticc energy (in the case of solids) and solvent (in the case of solutions) do play a dominant role on the favoured conformations.

Item Type: Journal Article
Publication: Current Science
Publisher: Current Science Assn
Additional Information: Copyright of this article belongs to Current Science Assn.
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 19 Jan 2010 11:52
Last Modified: 19 Sep 2010 05:43
URI: http://eprints.iisc.ac.in/id/eprint/22875

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