✦ LIBER ✦

Chemical synthesis of (1 → 2)-α-D-mannopyranan

✍ Scribed by Hidemasa Yamaguchi; Conrad Schuerch

Publisher: Wiley (John Wiley & Sons)
Year: 1980
Tongue: English
Weight: 566 KB
Volume: 19
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1980.360190208

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✦ Synopsis

Abstract

The polymerization of 1,2‐anhydro‐3,4,6‐tri‐O‐benzyl‐β‐D‐mannopyranose proceeds in the presence of Lewis acids, cationic coordination catalysts, and strong bases. Debenzylation of the products yields oligomeric saccharides or low polymers. Polymerization in toluene by means of potassium alkoxide complexed with crown ethers leads to essentially stereoregular (1 → 2)‐α‐D‐mannopyranan. The original derivatives have been characterized by optical rotation, viscosity, molecular weight, gel permeation chromatography, and spectrometry. The free polysaccharides have been characterized by optical rotation, molecular weight, and ^1^H‐ and ^13^C‐nmr spectrometry and compared to yeast mannan hydrolysate oligomers.

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