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Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 25.SE, Problem 70AP
Interpretation Introduction
Interpretation:
Based on the reaction the following answers are discussed.
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Trehalose, C12H22O11, is a nonreducing sugar that is only 45% as sweet as sugar. When hydrolyzed by aqueous acid or the enzyme maltase, it forms only d-glucose. When it is treated with excess methyl iodide in the presence of Ag2O and then hydrolyzed with water under acidic conditions, only 2,3,4,6-tetra-O-methyl-d-glucose is formed. Draw the structure of trehalose
a) The D-aldopentose A, C5H1005, reacts with HNO3 to yield an optically active aldaric acid B. Kiliani-Fischer
chain extension of A produces a pair of D-aldohexoses C and D. C is converted by HNO3 to an optically active
aldaric acid, but D is converted by HNO3 to an optically inactive aldaric acid. Write acyclic Fischer projections
for A, B, C, D.
b) Disaccharide E is a reducing sugar. It is hydrolyzed by an α-glycosidase enzyme, which means it contains an α-
glycoside link. Treatment of E with Ag2O and excess Mel gives an octamethyl derivative F. Hydrolysis of F in
dilute aqueous acid gives the pair of molecules shown below. Write the structures of E and F. (If the
stereochemistry at a particular carbon is not determined by the above data, indicate this with a wavy line as
shown below.)
HO OMe
OMe
MeO
MeO
MOH
OMe
mOH
OMe
OMe
a) The D-aldopentose A, C5H1005, reacts with HNO3 to yield an optically active aldaric acid B. Kiliani-Fischer
chain extension of A produces a pair of D-aldohexoses C and D. C is converted by HNO3 to an optically active
aldaric acid, but D is converted by HNO3 to an optically inactive aldaric acid. Write acyclic Fischer projections
for A, B, C, D.
Chapter 25 Solutions
Organic Chemistry
Ch. 25.1 - Prob. 1PCh. 25.2 - Prob. 2PCh. 25.2 - Prob. 3PCh. 25.2 - Prob. 4PCh. 25.2 - Prob. 5PCh. 25.3 - Prob. 6PCh. 25.3 - Prob. 7PCh. 25.4 - Prob. 8PCh. 25.4 - Prob. 9PCh. 25.4 - Prob. 10P
Ch. 25.5 - Prob. 11PCh. 25.5 - Prob. 12PCh. 25.5 - Prob. 13PCh. 25.5 - Prob. 14PCh. 25.5 - Prob. 15PCh. 25.6 - Prob. 16PCh. 25.6 - Prob. 17PCh. 25.6 - Prob. 18PCh. 25.6 - Prob. 19PCh. 25.6 - Prob. 20PCh. 25.6 - Prob. 21PCh. 25.6 - Prob. 22PCh. 25.6 - Prob. 23PCh. 25.7 - Prob. 24PCh. 25.8 - Show the product you would obtain from the...Ch. 25.SE - Prob. 26VCCh. 25.SE - Prob. 27VCCh. 25.SE - Prob. 28VCCh. 25.SE - Prob. 29VCCh. 25.SE - Prob. 30MPCh. 25.SE - Prob. 31MPCh. 25.SE - Glucosamine, one of the eight essential...Ch. 25.SE - D-Glicose reacts with acetone in the presence of...Ch. 25.SE - Prob. 34MPCh. 25.SE - Prob. 35MPCh. 25.SE - Prob. 36APCh. 25.SE - Prob. 37APCh. 25.SE - Prob. 38APCh. 25.SE - Prob. 39APCh. 25.SE - Prob. 40APCh. 25.SE - Assign R or S configuration to each chirality...Ch. 25.SE - Prob. 42APCh. 25.SE - Prob. 43APCh. 25.SE - Prob. 44APCh. 25.SE - Prob. 45APCh. 25.SE - Prob. 46APCh. 25.SE - Prob. 47APCh. 25.SE - Prob. 48APCh. 25.SE - Prob. 49APCh. 25.SE - Prob. 50APCh. 25.SE - Prob. 51APCh. 25.SE - Prob. 52APCh. 25.SE - Prob. 53APCh. 25.SE - Prob. 54APCh. 25.SE - Prob. 55APCh. 25.SE - Prob. 56APCh. 25.SE - Prob. 57APCh. 25.SE - Prob. 58APCh. 25.SE - Prob. 59APCh. 25.SE - Prob. 60APCh. 25.SE - Prob. 61APCh. 25.SE - Prob. 62APCh. 25.SE - Prob. 63APCh. 25.SE - D-Mannose reacts with acetone to give a...Ch. 25.SE - Prob. 65APCh. 25.SE - Prob. 66APCh. 25.SE - Prob. 67APCh. 25.SE - Prob. 68APCh. 25.SE - Prob. 69APCh. 25.SE - Prob. 70APCh. 25.SE - Prob. 71AP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- Two sugars differing in configuration at a single asymmetric carbon atom are known as epimers. D-mannose is a C-2 epimer of glucose (Structure I), while D-galactose is a C-4 epimer of glucose. Structure Il and IIl are H- -OH но- -H H OH HO H но- H HO H H -OH H- -OH HO OH H -OH H- -OH H OH HO. HO, OH II II Which of the following represents an aldopentose? OH H O HO O HO H но н HO H но- HO H HO H HO- H OH H OH H OH H OH OH HO Он of но" HO O OH он III IV These are chemical messengers that are secreted by endocrine glands and carried through the bloodstream to target tissues. prostaglandin deoxysugar glycoside hormones Which of the following is NOT correctly paired? cellulose: beta-1,4-glycosidic linkage amylose: alpha-1,4-glycosidic linkage chitosan: alpha-1,4-glycosidic linkage cellubiose: beta-1,4-glycosidic linkagearrow_forward(a) Label compounds A, B, and C as D- or L-sugars. (b) How are compounds A and B related? A and C? B and C? Choose from enantiomers, diastereomers, or constitutional isomers.arrow_forwardTrehalose, C12H22O11, is a nonreducing sugar that is only 45% as sweet as sugar. When hydrolyzed by aqueous acid or the enzyme maltase, it formsonly d-glucose. When it is treated with excess methyl iodide in the presence of Ag2O and then hydrolyzed with water under acidic conditions, only2,3,4,6-tetra-O-methyl-d-glucose is formed. Draw the structure of trehalose.arrow_forward
- 2) a-Draw the proper flat, Haworth form and most stable chair conformation for the B- anomer of L- glucopyranose b- Write the systematic name of this compound O: HO- НО—н НО H FOH HO-H -O- L-Gulosearrow_forwardThe structures of 4 isomers of ketopentose are shown. 1) which of the structures are diastereomers of structure A? C, B, or D 2) which of the structures are enantiomers of structure C? B, A, or D 3) which of the structures are stereoisomers of strcuture A?C, D, or Barrow_forward1. 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.arrow_forward
- (a) Label compounds A, B, and C as D- or L-sugars. (b) How are compounds A and B related? A and C? B and C? Choose from enantiomers, diastereomers, or constitutional isomers.arrow_forwardFischer projections for 2 D-aldohexosearrow_forwardC/: does the stable anti-conformer of CH3CH2C1 shows an equivalency of CH3 H's? Why?arrow_forward
- The acyclic form of D-talose is shown here as its Fischer projection. Identify the anomeric carbon. Но HO- H -OH D-Talose I Iarrow_forward23) Label the following pair as a/an enantiomer, diasteromer, structural isomer or identical C₂H5 НО (I) C₂H5 Н. (II) (III) HO НО OH -C2H5 он || -C2H5 OH НО Н. но. Н OH C₂H5 OH C₂H5 H H OH ОНarrow_forwardtion 6 of 17 > The structures of four isomers of a ketopentose are shown. OH کر کو 3 E D C 80 OH H-C-H 0=C HOLC-H HOC CH H-C-H OH A Dc $ 4 D B D D A Which of the structures are diastereomers of A? R F A DOD F4 H-C-H V OH C=0 HICIOH Но..C.....H HOLC-H HOCH H-C-H OH Which of the structures are stereoisomers of C? % 5 B T G H-C-H Es C=0 B H-C-H OH 6 C FG Y H & 7 OH H-C-H N 0=C HOLC…H HICIOH H-C-H 99 U OH D J * 8 M Which of the structures are enantiomers of C? - Ов OD A DII FB ( - 0 9 K DD FO H O < ) -O L command J F10 P A. : c F11 { [ option + ? 11 I 1 Attempt 5 F12 } 1 deletearrow_forward
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