Essential Organic Chemistry (3rd Edition)
3rd Edition
ISBN: 9780321937711
Author: Paula Yurkanis Bruice
Publisher: PEARSON
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Chapter 16, Problem 25P
Interpretation Introduction
Interpretation:
The method to determine which bottle contains D-lyxose is to be stated.
Concept Introduction:
Dilute nitric acid is a strong oxidizing agent. It is used to oxidize
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To synthesize D-galactose, a student went to the stockroom to get some D-lyxose to use as a starting material. She found that the labels had fallen off the bottles containing D-lyxose and D-xylose. How can she determine which bottle contains D-lyxose?
If anisole is allowed to sit in D2O that contains a small amount of D2SO4, what products are formed?
In 1891, Emil Fischer determined the structures of glucose and the seven other d-aldohexoses using only simple chemical reactions and clever reasoning about stereochemistry andsymmetry. He received the Nobel Prize for this work in 1902. Fischer had determined thatd-glucose is an aldohexose, and he used Ruff degradations to degrade it to (+)-glyceraldehyde. Therefore, the eight d-aldohexose structures shown in Figure 23-3 are the possiblestructures for glucose.Pretend that no names are shown in Figure 23-3 except for glyceraldehyde, and usethe following results to prove which of these structures represent glucose, mannose,arabinose, and erythrose.(a) Upon Ruff degradation, glucose and mannose give the same aldopentose: arabinose.Nitric acid oxidation of arabinose gives an optically active aldaric acid. What are thetwo possible structures of arabinose?(b) Upon Ruff degradation, arabinose gives the aldotetrose erythrose. Nitric acid oxidation of erythrose gives an optically inactive…
Chapter 16 Solutions
Essential Organic Chemistry (3rd Edition)
Ch. 16.1 - Prob. 1PCh. 16.2 - Prob. 2PCh. 16.3 - Prob. 3PCh. 16.3 - Prob. 4PCh. 16.4 - Prob. 5PCh. 16.4 - Prob. 6PCh. 16.5 - Prob. 7PCh. 16.5 - Prob. 8PCh. 16.6 - Prob. 10PCh. 16.8 - Prob. 12P
Ch. 16.8 - Prob. 14PCh. 16.9 - Prob. 15PCh. 16.10 - Prob. 16PCh. 16.11 - Refer to Figure 16.4 to answer the following...Ch. 16 - Prob. 18PCh. 16 - Prob. 19PCh. 16 - Prob. 20PCh. 16 - Prob. 21PCh. 16 - Prob. 22PCh. 16 - Prob. 23PCh. 16 - Prob. 24PCh. 16 - Prob. 25PCh. 16 - Name the following compounds:Ch. 16 - Prob. 28PCh. 16 - Prob. 29PCh. 16 - Prob. 31PCh. 16 - Prob. 32PCh. 16 - Prob. 33PCh. 16 - Prob. 34PCh. 16 - Prob. 35PCh. 16 - Prob. 36PCh. 16 - Prob. 37PCh. 16 - Draw the mechanism for the acid-catalyzed...Ch. 16 - Prob. 39PCh. 16 - Prob. 40PCh. 16 - Prob. 41P
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- In 1891, Emil Fischer determined the structures of glucose and the seven other d-aldohexoses using only simple chemical reactions and clever reasoning about stereochemistry andsymmetry. He received the Nobel Prize for this work in 1902. Fischer had determined thatd-glucose is an aldohexose, and he used Ruff degradations to degrade it to (+)-glyceraldehyde. Therefore, the eight d-aldohexose structures shown in Figure 23-3 are the possiblestructures for glucose.Pretend that no names are shown in Figure 23-3 except for glyceraldehyde, and usethe following results to prove which of these structures represent glucose, mannose,arabinose, and erythrose.(a) Upon Ruff degradation, glucose and mannose give the same aldopentose: arabinose.Nitric acid oxidation of arabinose gives an optically active aldaric acid. What are thetwo possible structures of arabinose?(b) Upon Ruff degradation, arabinose gives the aldotetrose erythrose. Nitric acid oxidation of erythrose gives an optically inactive…arrow_forwardIdentify the sugar in each description. a. An aldopentose that is not d-arabinose forms d-arabinitol when it is reduced with NaBH4. b. A sugar that is not D-altrose forms d-altraric acid when it is oxidized with nitric acid. c. A ketose that, when reduced with NaBH4, forms d-altritol and d-allitol.arrow_forwardSugar X is known to be a d-aldohexose. On oxidation with HNO3, X gives an optically inactive aldaric acid. WhenX is degraded to an aldopentose, oxidation of the aldopentose gives an optically active aldaric acid. Determine thestructure of Xarrow_forward
- An aldopentose "O", is oxidized with HNO3 to a diacid "P" which is optically active. The compound "O", is also degraded to an aldotetrose "Q" which undergoes another oxidation to an optically inactive diacid "R". Assuming that "O" has the configuration D-(4R); what are the structures of "O" to "R"?arrow_forwardThe 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-sugarsarrow_forwardPredict the products obtained when d-galactose reacts with each reagent. (f) excess Ac2O and pyridine (g) excess CH3 I, Ag2Oarrow_forward
- 1. Carbohydrates classification. 2. Write down the reactions: a) α,D-Glucopyranose + C2H5OH → b) D-Glucose + [Ag(NH3)2]+ → c) D-Glucopyranose + (CH3CO)2 O → d) D-Glucopyranose + CH3I → e) D-Glucose + HNO3 → f) D-Glucose + H2 → g) Lactose formation h) Sucrose hydrolysis 3. Write down the formula of β,D-galactopyranosearrow_forwardRegarding the following monosaccharides, indicate the CORRECT alternative: a) Only Gulosa, Idosa and Mannose can produce alditols because they are aldoses. b) There is only one pair of epimers. c) The reaction of Idosa with HNO3 converts it into a product without optical activity. d) Only two monosaccharides will give a positive result with Fehling's reagent. e) Mutarotation converts D-psychose into an aldose.arrow_forwardd-Altrose is an aldohexose. Ruff degradation of d-altrose gives the same aldopentose asdoes degradation of d-allose, the C3 epimer of glucose. Give the structure of d-altrosearrow_forward
- does structure E represent fructofuranose? explainarrow_forwardShow the steps in converting Fischer to Haworth to: Convert D-Talose to its aIpha pyranose structure. Convert D-Tagatose to its beta furanose structure.arrow_forwardd-Xylose and d-lyxose are formed when d-threose undergoes a Kiliani–Fischer synthesis. d-Xylose is oxidized to an optically inactive aldaric acid,whereas d-lyxose forms an optically active aldaric acid. What are the structures of d-xylose and d-lyxose?arrow_forward
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