Synthetic Non-reducing Disaccharides

In connection with synthetic studies of fragments of the O-antigens of the polysaccharide of Shigella flexneri three pentasaccharides were made based on the tetramer p-D-GlcNAc-(1 2)-a-L-Rha-(1 2)-a-L-Rha-(l- 3)-L-Rha with modifications as follows a-D-Glc substituted at 0-4 of the terminal Rha unit, the same substituent at the 0-3 of the central Rha unit, and a-D-Glc attached at 0-3 of the terminal Rha and also, at the non-reducing end, the disaccharide moiety inverted in a-L-Rha-(l->3)-p-D-GlcNAc-(l- 2)-a-L-Rha-(l- 2)-[a-D-Glc-(l- 3)]-L-Rha. ... 

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