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- 23) Label the following pair as a/an enantiomer, diasteromer, structural isomer or identical C₂H5 НО (I) C₂H5 Н. (II) (III) HO НО OH -C2H5 он || -C2H5 OH НО Н. но. Н OH C₂H5 OH C₂H5 H H OH ОН1. Draw Haworth projections of B-D-arabinofuranose and a-L-mannopyranose. 2. Consider the structure of the disaccharide drawn at right: НО `CH2 В ОН (a) Give the names and D/L designation for the two monosaccharides linked together. H,C-O OHO „OH OH А: НО НО A В: ОН (b) In the structure, circle the anomeric carbon of each saccharide. (c) Is each saccharide present in its a or ß anomer? Specify both A and B (d) Would this disaccharide undergo mutarotation? Why or why not? (e) Would this disaccharide react with Tollens and/or Benedicts reagent? Why or why not? (f) There are two reasons this is very unlikely to be a naturally occurring disaccharide. What about its structure suggests this is true? Give both reasons.но CH₂OH Но НО anx CH₂OH НО OH CH3OH H* ӧ: H OH OH B-D-glucose Treatment of B-D-glucose with methanol in the presence of an acid catalyst converts it into a mixture of two compounds called methyl glucosides. Draw curved arrow to show the movement of electrons in this step of the reaction mechanism. Arrow-pushing Instructions HO H₂O CH₂OH Q-CH3 OCH3 + HO OH НО methyl B-D-glucoside CH₂OH -Ö: ний но НО CH₂OH НО он methyl a-D-glucoside OH OCH3 Н w-CH3 H2O
- Select ALL of the TRUE descriptors of this structure: -OH H- -OH но -H HO -H CHOH |D-sugar ) L-sugar Ketose Aldose | Triose | Tetrose Pentose |HexoseThe reaction below is: hy Cl2 heterolysis homolysis heterogenic homogenicAn oligosaccharide isolated from an organism is found tocontain two glucose residues and one galactose residue.Exhaustive methylation followed by hydrolysis producedtwo glucoses with methoxy groups at positions 2, 3,and 6 and galactose with methoxy groups at positions2, 3, 4, and 6. What is the structure of the originaloligosaccharide?
- The C2-epimer of D-xylose is called (blank 1). The enediol rearrangementconverts an aldose into a (blank 2). The aldopentose embedded in RNA is(blank 3). An aldopentose would have (blank 4) possible stereoisomers,of whichBlankwould be D-sugars. An ketopentose would have (blank 4) possiblestereoisomers, of which (blank 5) would be D-sugarsGive typing answer with explanation and conclusionShown here is a/anglycosidic linkage. CH₂OH CH₂OH I OH Н OH Н O Alpha Beta OL- O D- О Н I ОН HO OH -О Н Н H OH OH