Question

3. Treatment of an unknown disaccharide with an excess of methyl iodide followed by aqueous sulfuric acid produced the disaccharides below. Treatment of the disaccharide in aqueous solution with 2,4-dinitrophenyl hydraz in e (2,4-DNP) gave a precipitate, indicating the presence of a ketone in the disaccharide. он нсо н.со нно, чосн, нсо нсо" но осн, Осн, Draw the structure of the disaccharide. Depict both of the monosaccharide units in their cyclic forms. a.

Answer 1

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2 August Week. 35 7 AUGUST Mo Tu We Th Fr Sa S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 SATURDAY 3CH25 26 27 28 9.00 2 Excess Mel Unknown disaccharide. 2. H₂SO4 10.00 IA och me do ocn34 11.00 21 + 12.00 Born on 1.00 only case this position in free a is hco f 3 Horor r och, o 200 Above inference cleary indicate the point of linkage in disaccharide sugar lei 3.00 1-position af sugar B & 3'-position of sugar C, because only this position is free in monosaccharide sugar, on sugar C position - I have one hydroxy group , but it is present in hemiketal form, & responsible you 100 giving keto group test, when treated with 2,4-DNP reagent ome Loon rome Ho cha tsB +C 1 ome Excess MeI Och 28 Sunday ОИ Munn 2016 bed wit7 Cat Scann OH Hot hon - Unknown disaccharide