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CHAPTER 25 2. If D-arabinose underwent the Wohl Degradation (chain shortening), what new sugar would be...
Chapter 25: Reactions & Linkages Name: 1. If D-ribose underwent the Kiliani-Fischer synthesis (chain lengthening), what...
Chapter 25: Reactions & Linkages Name: 1. If D-ribose underwent the Kiliani-Fischer synthesis (chain lengthening), what two new sugars would be produced. Draw the Fischer projections of the new sugars. CHO Н. OH Kiliani-Fischer H OH Synthesis H -OH CH2OH D-Ribose
2. Draw Fischer projections of the open chain tautomer of each of the monosaccharides shown below,...
2. Draw Fischer projections of the open chain tautomer of each of the monosaccharides shown below, and indicate whether the compound is: i. an aldose or a ketose; ii. a D- or an L-sugar; iii. a triose, tetrose, pentose or hexose OH OH HO HO HO OH OH HO OH OH HO H OH 3. Draw Fischer projections of L-arabinose, D-fucose, and L-mannoheptulose given the structures below OH CHO CHO HOH HOH HOHH H-OH HOH H OH H OH OH...
Culhydrates 1. Complete th Complete the table by classifying each sugar sugar (A, B, C, D)...
Culhydrates 1. Complete th Complete the table by classifying each sugar sugar (A, B, C, D) below based on carbonyl group and number of carbons (c.8. aldohexose, ketotriose, etc.). Classify them as an antiomer. Indicate the number of chiral carbons for each sugar. Sugar Classification based on carbonyl group and number of carbons Lor D enantiomer Number of chiral carbons н-с-он HO-6-H. н-с-он ін,он CH,OH C=0 HO-C-H н-с-он HO-C-H. ён,он снон c=0 | HO-C-H ін,он H-C-OH CH, OH CD 2....
Chemistry help please 3 easy questions 3. Which are the correct configurations of the two chirality...
Chemistry help please 3 easy
questions
3. Which are the correct configurations of the two chirality centers (stereocenters) in the following Fischer projection? CHO H HO ОН H CH2OH A. 2R, 3R B. 2R, 3S C. 2S, 3R D. 2S, 3S 4. When a sugar was treated with warm nitric acid it gave an optically active compound. Wohl degradation of the same sugar gave L-glyceraldehyde. The structure of the sugar is CHO -ОН H HO H CHO HO -H HO...
ÇI-lagl- (2 pts) Use the Fischer projection shown below for the sugar D-altrose to draw a...
ÇI-lagl- (2 pts) Use the Fischer projection shown below for the sugar D-altrose to draw a Haworth projection of the beta- 2. pyranose form of this sugar. но -Н H- OH H- OH OH H- CH-ОН 1
Draw the Fischer projections of the four aldotetroses. Draw the D-sugar on the left and its...
Draw the Fischer projections of the four aldotetroses. Draw the D-sugar on the left and its L-isomer directly to the right of it. Be sure you select the appropriate hydroxy group so that the bond carbon is connected to the oxygen bond. Draw D sugar 1 Draw L sugar 1 H H CH2OH Answer Bank CH2OH -OH Н но- Draw D sugar 2 Draw L sugar 2 H Answer Bank CH2OH CH-он он н Но- Draw D sugar 2 Draw...
11.a) Draw the open chain (Fischer) structure of D-altrose. (1pt) (b) How many chiral centers are...
11.a) Draw the open chain (Fischer) structure of D-altrose.
(1pt)
(b) How many chiral centers are in D-altrose? ______ (1pt)
(c) What is the maximum number of possible stereoisomers whch
can exist for D-altrose? _____ (1pt)
(d) Draw L-altrose in open chain form (use Fischer projection) –
you may use the space above. (1pt)
(e) Use the information above to draw a Haworth projection for
alpha-D-altropyranose. (2pt)
Ruff degradation on a monosaccharide causes C1 to be lost as
carbon dioxide,...
CHO 1. NH2OH 2. Ac2o 3. CH,O CHO OH H- HO H HO H HCN H...
CHO 1. NH2OH 2. Ac2o 3. CH,O CHO OH H- HO H HO H HCN H OH OH H- OH H- -OH H- CH2OH CH2OH The Wohl degradation is a series of reactions that shorten an aldose chain by one carbon, it is almost the exact opposite of the Kiliani In this reaction the aldose aldehyde carbonyl group is converted into a nitrile. The resulting cyanohydrin loses HCN under basic cone Conversion of the aldehyde to a nitrile is accomplished...
18. Draw the product of the following Dieckmann cyclization: 1) NaOCH2CH3 CH3CH2OH 2) H30* 19. Glucosamine...
18. Draw the product of the following Dieckmann cyclization: 1) NaOCH2CH3 CH3CH2OH 2) H30* 19. Glucosamine is a product of the fermentation of corn and is shown below. Draw the Fischer projection of glucosamine: OH H ОН NH2 OH 20. Draw the most stable chair conformation of the D-idose, whose Fisher projection is shown below. Is it an a-or B-anomer? CHO HO -H H- -OH HO Н H -OH CH2OH
1. Which of the following is an aldohexose? 2. Which of the following is a cetopentose? 3. Which of the following best d...
1.
Which of the following is an aldohexose?
2. Which of the following is a cetopentose?
3. Which of the following best describes the relationship
between D-glucose and D-fructose?
4. Which of the following is (are) L-alfohexose(s)?
5. Which of the following aldohexose(s) is (are)
dextrorotatory?
6. How many stereoisomers are possible for L-galactose? Draw
or look for its structure.
7. Which of the following conpounds is a pair of
enantiomers?
8. Draw the fisher projection for L-sedoheptulose and also...
Chapter 25: Reactions & Linkages Name: 1. If D-ribose underwent the Kiliani-Fischer synthesis (chain lengthening), what two new sugars would be produced. Draw the Fischer projections of the new sugars. CHO Н. OH Kiliani-Fischer H OH Synthesis H -OH CH2OH D-Ribose
2. Draw Fischer projections of the open chain tautomer of each of the monosaccharides shown below, and indicate whether the compound is: i. an aldose or a ketose; ii. a D- or an L-sugar; iii. a triose, tetrose, pentose or hexose OH OH HO HO HO OH OH HO OH OH HO H OH 3. Draw Fischer projections of L-arabinose, D-fucose, and L-mannoheptulose given the structures below OH CHO CHO HOH HOH HOHH H-OH HOH H OH H OH OH...
Culhydrates 1. Complete th Complete the table by classifying each sugar sugar (A, B, C, D) below based on carbonyl group and number of carbons (c.8. aldohexose, ketotriose, etc.). Classify them as an antiomer. Indicate the number of chiral carbons for each sugar. Sugar Classification based on carbonyl group and number of carbons Lor D enantiomer Number of chiral carbons н-с-он HO-6-H. н-с-он ін,он CH,OH C=0 HO-C-H н-с-он HO-C-H. ён,он снон c=0 | HO-C-H ін,он H-C-OH CH, OH CD 2....
Chemistry help please 3 easy
questions
3. Which are the correct configurations of the two chirality centers (stereocenters) in the following Fischer projection? CHO H HO ОН H CH2OH A. 2R, 3R B. 2R, 3S C. 2S, 3R D. 2S, 3S 4. When a sugar was treated with warm nitric acid it gave an optically active compound. Wohl degradation of the same sugar gave L-glyceraldehyde. The structure of the sugar is CHO -ОН H HO H CHO HO -H HO...
ÇI-lagl- (2 pts) Use the Fischer projection shown below for the sugar D-altrose to draw a Haworth projection of the beta- 2. pyranose form of this sugar. но -Н H- OH H- OH OH H- CH-ОН 1
Draw the Fischer projections of the four aldotetroses. Draw the D-sugar on the left and its L-isomer directly to the right of it. Be sure you select the appropriate hydroxy group so that the bond carbon is connected to the oxygen bond. Draw D sugar 1 Draw L sugar 1 H H CH2OH Answer Bank CH2OH -OH Н но- Draw D sugar 2 Draw L sugar 2 H Answer Bank CH2OH CH-он он н Но- Draw D sugar 2 Draw...
11.a) Draw the open chain (Fischer) structure of D-altrose.
(1pt)
(b) How many chiral centers are in D-altrose? ______ (1pt)
(c) What is the maximum number of possible stereoisomers whch
can exist for D-altrose? _____ (1pt)
(d) Draw L-altrose in open chain form (use Fischer projection) –
you may use the space above. (1pt)
(e) Use the information above to draw a Haworth projection for
alpha-D-altropyranose. (2pt)
Ruff degradation on a monosaccharide causes C1 to be lost as
carbon dioxide,...
CHO 1. NH2OH 2. Ac2o 3. CH,O CHO OH H- HO H HO H HCN H OH OH H- OH H- -OH H- CH2OH CH2OH The Wohl degradation is a series of reactions that shorten an aldose chain by one carbon, it is almost the exact opposite of the Kiliani In this reaction the aldose aldehyde carbonyl group is converted into a nitrile. The resulting cyanohydrin loses HCN under basic cone Conversion of the aldehyde to a nitrile is accomplished...
18. Draw the product of the following Dieckmann cyclization: 1) NaOCH2CH3 CH3CH2OH 2) H30* 19. Glucosamine is a product of the fermentation of corn and is shown below. Draw the Fischer projection of glucosamine: OH H ОН NH2 OH 20. Draw the most stable chair conformation of the D-idose, whose Fisher projection is shown below. Is it an a-or B-anomer? CHO HO -H H- -OH HO Н H -OH CH2OH
1.
Which of the following is an aldohexose?
2. Which of the following is a cetopentose?
3. Which of the following best describes the relationship
between D-glucose and D-fructose?
4. Which of the following is (are) L-alfohexose(s)?
5. Which of the following aldohexose(s) is (are)
dextrorotatory?
6. How many stereoisomers are possible for L-galactose? Draw
or look for its structure.
7. Which of the following conpounds is a pair of
enantiomers?
8. Draw the fisher projection for L-sedoheptulose and also...
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