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- 6 CH2OH 4 OH 2 ОН 3 OH (d) Draw the hemiacetal that results from above acetal. (e) Draw the open chain equivalent of the sugar in part (d). (f) Classify the monosaccharide below as a D-sugar or an L-sugar. H ОН O. ОН CH2OH ОН ОНO- alpha (1->4) ОН The name of this disaccharide is ribofuranose CH2OH It is a non-reducing ОН + ОН - -D- glucopyranosyl alpha sugar. CH2OH ОН ОН - -D-37 Following is a structural formula for a disaccharide. Sureonos aida -vlg e stellua boot nal H to dileed era of bis na as noitesger CH₂OH O O H Iq4 OH tomotub CH₂OH F 0 H OH Η OH H O Helo mendem H OH Η Η OH H H H Poanta OH ▶46 18 (a) Name the two monosaccharide units in the disaccharide. OH (b) Describe the glycosidic bond. (c) Is this disaccharide a reducing sugar or a non- reducing sugar? ITC (d) Will this disaccharide undergo mutarotation?
- 4. Identify the component monosaccharides of each of the following compounds and describe the type of glycosidic linkage in each. Но он Но OH HO он Но- Но- (a) OH (c) CH,OHO. (b) CH2OHO Lon OH HO H ČHOH H OH ÓH 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.6 сH-он (5 4 OH 1 2 ОН 3 OH (c) Trace and identify the acetal in the above monosaccharide. (d) Draw the hemiacetal that results from above acetal. (e) Draw the open chain equivalent of the sugar in part (d).
- The following sugar is? -ОН Но ОН O Но 0 ОН O A reducing sugar O Linked by an N-glycosidic bond O Derived from 2 ketoses O A non-reducing sugar trisaccharide -ОН НО ОН14) What type of glycosidic bond is shown here? Н OH A) a(1-4) B) a(1-6) C) B(1-4) D) B(1-6) CH₂OH H OH H I OH H H OH CH₂ H OH He od О I но-но- Н HOT1 OH OHНО Но н Н- НО он Н Н HO H OH оно н Н H. H Н ОН Н H н 아처 OH CH НО.
- Which of the following disaccharides is a non-reducing sugar? НО O U О О НО- O A D B لیتا ОН ОН НО- ОН НО. ОН ОН A C НО НО ОН ОН ОН ОН прион HO OH но.... HO НО -ОН HO ОН в NH₂ OH то OH D II O -OH НО OH NH₂ OHDraw the Haworth or Chair Haworth structures of the following disaccharides: (a) α-D-glucopyranosyl-(1,4)-β, D-galactopyranose (b) β,D-galactopyranosyl-(1,4)-α-D-glucopyranose (c) β-D-glucopyranosyl-(1,4)-α,D-galactopyranose. Identify all anomeric carbons and hemiacetal, acetal, hemiketal, and ketal linkages.m) Which pyranose ring (A, B, C, or D) in the tetrasaccharide below is derived from D-altrose? The Fischer projections for the four aldohexoses that make up this tetrasaccharide are shown below. B C D HOH CHO CHO CHO CHO HO+H HTOH Fонно н HOH HOH H-OH H-OH H-+-OH H-TOHHOH HOH H+OH HOHнтон нон CHOH CHOH CHOH CHOH De D-glue Dalose Datrone i NH Į HOH STEP 1 OH, HO- answer 1. Just add arrows and charges for steps 1, 2, and 3 in formation of this enamine з no arrows needed here OH н Н ЮН -OH STEP 3 :ÖH н H STEP 2 на это про за поч