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- What aldoses are formed when the following aldoses are subjected to the Kiliani–Fischer synthesis: (a) d-threose; (b) dribose; (c) D-galactose?2. Draw structures for furanose and pyranose forms of D- lyxose. Draw the scheme of a tautomeric equilibrium for D-lyxose (a and b-anomers).Predict the products obtained when d-galactose reacts with each reagent.(a) Br2 and H2O (b) NaOH, H2O (c) CH3OH, H + (d) Ag(NH3) 2+ -OH(e) H2, Ni (f) excess Ac2O and pyridine (g) excess CH3 I, Ag2O (h) NaBH4(i) Br2, H2O, then H2O2 and Fe2(SO4)3 (j) (1) KCN/HCN; (2) H2, Pd/BaSO4; (3) H3O! (k) excess HIO42
- Predict the products obtained when d-galactose reacts with each reagent. (f) excess Ac2O and pyridine (g) excess CH3 I, Ag2OWhat aldoses are formed when the following aldoses are subjected to the Kiliani-Fischer synthesis: (a) D-threose; (b) D-ribose; (c) D-galactose?5. Which two D-pentose sugars give optically active alditols when reduced with NABH4 CHO н— он CH2OH D-glyceraldehyde. Сно CHO H HOH H HOH CH2OH „D-erythrose HO H H HOH ČH2OH D-threose CHO CHO CHO CHO -OH HO-H H OH Но -O- H +OH но -H но- H- HFOH CH2OH H- -OH H +OH H FOH CH2OH CH2OH ČH2OH D-ribose D-arabinose D-хylose D-lyхose CHO CHO CHO CHO Сно CHO CHO CHO HO-H HO-H HO-H H HOH но—н но—н H FOH H HOH H +OH HO-H H FOH H- -O- HO-H но- H OH H- -O- но но—н H FOH HO-H H +OH CH2OH H HOH H -OH H HOH H FOH но FH HHOH ČH2OH HHOH ČH2OH H- -OH H -OH H- -OH -OH ČH2OH ČH2OH CH2OH CH2OH ČH2OH D-allose D-altose D-glucose D-mannose D-gulose D-idose D-galactose D-talose
- 1. 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.The following observations are obtained after a D-hexose was made to react with several reagents: (1) The reactions of a D-hexose with (a) to (d) below yields an aldaric acid (a) NH₂OH, (b) (CH3CO)₂O, NaOCOCH 3, and, (c) NaOCH3, and then, (d) HNO3, H₂O (2) HNO3 oxidation of the same D-hexose gives an aldaric acid. Predict the structures of the three (3) possible hexoses that can undergo the above reactions?CH OH CH OH CH,OH CHOH CH2 CHOH O OH OH CH2 HO OH C 3 CHOH OH OH OH OH OH OH OH OH Download Image... The oligosaccharide was subjected to exhaustive methylation followed by acid hydrolysis. The product obtained for manosaccharide A is O A. 1,2,3,4,6-penta-0-methylfructose O B. 2,3,4-tri-O-methyfructose OC 1,3,4,6-tetra-O-methylfructose O D.2,3,4,5-tetra-O-methylfructose P Type here to search
- Predict the products obtained when d-galactose reacts with each reagent. (h) NaBH4(i) Br2, H2O, then H2O2 and Fe2(SO4)36. Identifv each of the following reactions as an organic oxidation, reduction or neither. Pt + H, b. COO ÇO0 но -с — н C=0 Malate dehydrogenase CH; + NAD CH; + NADH + H COO COO Malate Oxaloacetate с. OH ACP + NADPH + H* ACP + NADP* d. OH + ноDetermine A and B to complete the reaction below: CH,OH CH,OH H+ OH OH H,0 OH OCH OH OH tr-D-glucopyranose a glycoside O A: CH3 ; B. H2O O A CH3CH2OH; B. H2O O A CH3OH; B. H2O О А ОСНЗ В. Н20