Mutarotation occurs when the two anomers interconvert in solution. Outline a stepwise mechanism for the acid-catalysed interconversion of glucose anomers by mutarotation. OH OH HO H,O* HO HO Но но. HO
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- Click on the glycosidic linkage НО CH2OH ОН ОН CH₂OH ОН ОН ОН(d) Draw the structure of the expected product when monosaccharide B undergo mutarotation upon dissolving in water in the presence of Tollens reagent (AGNO3, NHẠOH). он OH O. OH OH OH monosaccharide BThe dynamic process by which both forms of a- and B-D-glucopyranose in solution change slowly into an equilibrium mixture of both is known as (choose the name). OH OH Но но НО HO OH OH OH OH a-D-glucopyranose 36% B-D-glucopyranose 64% OA Acetylation O B. Enediol Rearrangement OC Mutarotation O D. Acetal Formation O E Epimerization
- Shown 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 OHMutarotation occurs when the two anomers interconvert in solution. Outline a stepwise mechanism for the acid-catalysed interconversion of glucose anomers by mutarotation. он он H,0* но OH Но Но НО ÓHIdentify the anomeric carbon. Identify the glycosidic linkage. Lactose ОН ОН OH HO HO, HO OH
- In solution, glucose is mostly found in the cyclic hemiacetal state, which lacks an aldehyde group. How are mild oxidising agents able to oxidise glucose?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 ОНTrehalose and maltose are both dimers of glucose. However, they have considereably different reactivities. Concisely explain why these differences are observed. но но HO HO но "HO он но он OH O HO OHOH но trehalose maltose 1. Malthose is a reducing sugar while trehalose is not. 2. Trehalose is very resistant to acid hydrolysis while maltose can be acid-hydrolyzed with ease.
- Cellulose is not digestible by humans because it contains glucose units linked by -glycosidic bonds. O a-1,6 O a-1,4 O a-1,2 O B-1,4 O B-1,2rivatives: Nucleophilic Acyl Substitution Reactions - EOC O C-O [References] One step in the gluconeogenesis pathway for the biosynthesis of glucose is the partial reduction of 3-phosphoglycerate to give glyceraldehyde 3-phosphate. The process occurs by phosphorylation with ATP to give 1,3-bisphosphoglycerate, reaction with a thiol group on the enzyme to give an enzyme-bound thioester, and reduction with NADH. H-C-OH ATP ADP CH₂OPO32- 3-phosphoglycerate 0= OPO32- C H-C-OH CH₂OPO32 1,3-bisphosphoglycerate Enz-SH PO43- O= C S-Enz H-C-OH CH₂OPO3² (Enzyme-bound thioester) NADH/H+ O=C NAD*, Enz-SH H H-C-OH CH₂OPO3²- glyceraldehyde 3-phosphate Propose a structure for the first intermediate in the reaction of the enzyme-bound thioester with NADH to form glyceraldehyde 3-phosphate. To simplify the drawing process, substitute the structure below for the enzyme-bound thioester. S-CH3 substitute for the CH2CH3 enzyme-bound thioester You do not have to consider stereochemistry. • You do not have…The following molecule has a glycosidic bond that is best described as HỌ – CH2 НО HỌ – CH2 HO OH O ОН alpha-1,4-glycosidic bond beta-1,6-glycosidic band alpha-1,6-glycosidic bond beta-1,4-glycosidic bond ОН OH OH.H2O