5, 6-Unsaturated disaccharide derivative prepared from maltose via its 6-iodo derivative was treated with mercuric chloride, giving α-linked pseudodisaccharide in good yield, which contains cyclohexanonederivatives as constituents. On treatment with an acetic anhydride-pyridine mixture, the cyclohexanone constituents underwent β-elimination to be changed into a sole cyclohexenone moiety. Hydrogenation of the double bond between two carbon atoms and subsequent reductive amination of the carbonyl group gave aminocyclitol-containing pseudodisaccharides.

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