Attempted synthesis of pseudoaldobiuronic acids.

Glycosides, oligosaccharides, and especially polysaccharides are widespread in nature and occur in bacteria, algae, land plants and animals. One of their most important characteristics is their ability to hydrolyze under the influence of acids, and this fact makes it relatively easy to determine their overall chemical composition, as well as their detailed structure. On the other hand, it is often desirable to avoid hydrolytic depolymerization of polysaccharides, either for practical or for theoretical reasons. [...