A D-aldohexose A is formed from an aldopentose B by the Kiliani-Fischer synthesis. Reduction of A with NABH4 forms an optically inactive alditol. Oxidation of B forms an optically active aldaric acid. What are the structures of A and B?
Q: Trehalose is a nonreducing disaccharide (C12H22O11) isolated from the poisonous mushroom Amanita…
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Q: Threose is an aldose monosaccharide. The Fischer projection of D-threose is shown.
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A: A question based on biochemistry that is to be accomplished.
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Q: Using Fischer projection structure where no cyclization took place, what product/s formed when…
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A: To find: The structure of 2-ketohexose
Q: Identify the sugar in each description. a. An aldopentose that is not d-arabinose forms d-arabinitol…
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Q: What monosaccharides are formed in the Kiliani-Fischer synthesis starting with D-xylose? HCFO H--OH…
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Q: Draw the structure of the expected product when monosaccharide A undergo mutarotation upon…
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Q: A D-aldohexose A is formed from an aldopentose B by the Kiliani–Fischer synthesis. Reduction of A…
A: Compound A is D-aldopentose. When treated with sodium borohydride, it is converted into alditol…
Q: Name an aldohexose other than d-glucose that is oxidized to d-glucaric acid by nitric acid.
A: The d-glucose when react with nitric acid undergo oxidation to form d-glutaric acid also known as…
Q: Draw the structure of the expected product when monosaccharide A undergo mutarotation upon…
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Q: What reaction is responsible for the conversion of linear d-glucose to cyclic d-glucose? A.…
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Q: The carbonyl group in d-galactose may be isomerized from C1 to C2 by brief treatmentwith dilute base…
A: The isomerization of carbonyl group in D-galactose from C1 to C2 represented as shown below.
Q: Aldohexoses A and B are formed from aldopentose C via a Kiliani–Fischer synthesis. Nitric acid…
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Q: Consider the tetrasaccharide stachyose drawn below. Stachyose is found in white jasmine, soybeans,…
A: a. b.
Q: A D-aldopentose is oxidized by nitric acid to an optically active aldaric acid. A Wohl degradation…
A: The process and indentification of the D-aldopentose is done below:
Q: A hexose was obtained after (+)-glyceraldehyde underwent three successive Kiliani–Fischer syntheses.…
A: The above info can be used to identify the hexose as follows:
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Q: Draw Fischer projections for the product(s) formed by reaction of d-ribose with the following. In…
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Q: Predict the products obtained when d-galactose reacts with each reagent.(a) Br2 and H2O (b) NaOH,…
A: SOLUTION: Step 1: (a). d-galactose on oxidation with bromine water forms galactonic acid. The…
Q: What D-aldohexose forms the same osazone as D-glucose?
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Q: Draw the two possible Haworth structures (both alpha and beta anomers) for the following…
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Q: Answer the following questions about the eight aldopentoses: a. Which are enantiomers? b. Which are…
A: a. The aldopentoses are eight in number which consists of D and L form of ribose, arabinose, xylose…
Q: Predict the products obtained when d-galactose reacts with each reagent.(a) Br2 and H2O
A: The structure of D-galactose is as follows,
Q: Draw Fischer projections for the product(s) formed by reaction of d-galactose with the following. In…
A: The D-galactose can be oxidized to form aldaric acid in the presence of strong oxidizing agent HNO3.…
Q: A 2-ketohexose is reduced with NaBH4 in CH3OH to form a mixture of D-galactitol and Dtalitol. What…
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Q: Draw Fischer projections for the product(s) formed by reaction of d-ribose with the following. In…
A: In presence of strong oxidizing agent HNO3, D-galactose is oxidized to form aldaric acid. Because of…
Q: Draw Fischer projections for the product(s) formed by reaction of d-galactose with the following. In…
A: When three-dimensional molecules are represented in two-dimensional form, a representation called…
Q: (d) Draw the structure of the expected product when monosaccharide C undergo mutarotation upon…
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Q: A 2-ketohexose is reduced with NaBH4 in CH3OH to form a mixture of D-galactitol and D-talitol. What…
A: Given that a mixture of D-galactitol and D-talitol is formed by the reduction of a 2-ketohexose…
Q: What product or products are obtained when d-galactose reacts with each of the following? a. nitric…
A: D-galactose is monosaccharide molecule. Nitric acid behaves as good oxidizing agent. It oxidizes…
Q: d-Xylose and d-lyxose are formed when d-threose undergoes a Kiliani–Fischer synthesis. d-Xylose is…
A: In carbohydrates, we studied carbohydrates containing five carbon atoms. Here we will discuss the…
Q: A D-aldopentose A is reduced to an optically active alditol. Upon Kiliani–Fischer synthesis, A is…
A: The layout of the given reaction sequence is shown below:
Q: Identify the sugar in description. An aldopentose that is not d-arabinose forms d-arabinitol when it…
A: Sodium borohydride is used as a reducing agent (addition of hydrogen). Its molecular formula is…
Q: Which d-aldohexose in its beta-d-pyranose form has only one OH group in the axial position? O…
A: The beta-d-pyranose forms of given d-aldohexoses are shown below, (1) D-allose (2) D-galactose
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- A D-aldohexose A is formed from an aldopentose B by the Kiliani–Fischer synthesis. Reduction of A with NaBH4 forms an optically inactive alditol. Oxidation of B forms an optically active aldaric acid. What are the structures of A and B?A D-aldopentose A is reduced to an optically active alditol. Upon Kiliani–Fischer synthesis, A is converted to two Daldohexoses, B and C. B is oxidized to an optically inactive aldaric acid. C is oxidized to an optically active aldaric acid. What are the structures of A–C?Sugar 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 X
- Aldohexoses A and B are formed from aldopentose C via a Kiliani–Fischer synthesis. Nitric acid oxidizes A to an optically active aldaric acid, B to an optically inactive aldaric acid, and C to an optically active aldaric acid. Wohl degradation of C forms D, which is oxidized by nitric acid to an optically active aldaric acid. Wohl degradation of D forms (+)-glyceraldehyde. Identify A, B, C, and D.Raffinose is a trisaccharide (C18H32O16) isolated from cottonseed meal. Raffinose doesnot reduce Tollens reagent, and it does not mutarotate. Complete hydrolysis of raffinosegives d-glucose, d-fructose, and d-galactose. When raffinose is treated with invertase,the products are d-fructose and a reducing disaccharide called melibiose. Raffinose isunaffected by treatment with a b@galactosidase, but an a@galactosidase hydrolyzes itto d-galactose and sucrose. When raffinose is treated with dimethyl sulfate and basefollowed by hydrolysis, the products are 2,3,4-tri-O-methylglucose, 1,3,4,6-tetraO-methylfructose, and 2,3,4,6-tetra-O-methylgalactose. Determine the completestructures of raffinose and melibiose, and give a systematic name for melibiose.An unknown reducing disaccharide is found to be unaffected by invertase enzymes. Treatment with an a@galactosidasecleaves the disaccharide to give one molecule of d-fructose and one molecule of d-galactose. When the disaccharideis treated with excess iodomethane and silver oxide and then hydrolyzed in dilute acid, the products are2,3,4,6-tetra-O-methylgalactose and 1,3,4-tri-O-methylfructose. Propose a structure for this disaccharide, and give itscomplete systematic name.
- Identify 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.d-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?Identify the sugar in description. An aldopentose that is not d-arabinose forms d-arabinitol when it is reduced with NaBH4.
- Draw Fischer projections for the product(s) formed by reaction of d-ribose with the following. In addition, state whether each product is optically active or inactive Q. NaBH4 in H2ORegarding 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.
