Homework Answers
In a carbohydrate chain structure is converted into cyclic
product in the presence of H+ 
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3. Two structures of fructose are shown below: the open chain and cyclized. Show the mechanism...
Answer for 1a and 1b 1. Below are the cyclic and open-chain structures for glucose and...
Answer for 1a and 1b
1. Below are the cyclic and open-chain structures for glucose and fructose. (6 points total) а) Label each structure as glucose or fructose. (1 pt each, 4 pts) b) Glucose is a(n) and fructose is a(n). (ketose, aldose) (1 pt each, 2 pts) CH,OH -он HOCH ОН HOH н но/сн,он он OH H o=4 нон Но+н н+он н+он CH2OH CH2OH с=0 но-н нон н+он Сн,он
Carbohydrates 1. Label each of the monosaccharides shown below as a triose, tetrose, pentoso, or hexose....
Carbohydrates 1. Label each of the monosaccharides shown below as a triose, tetrose, pentoso, or hexose. но CH OH HT -он - он Н - ОН но -н но -Н но -н нон сньон он но -н НОН CH OH нон нон нон снон CH OH сон сон H- OH H- -он OH cң, он н-с-он Сн,он снон 2. Label each of the monosaccharides shown above as a ketose or aldose. 3. Identify all of the chiral carbons in the...
Question 1: Compare the possible ring structures and conformers for fructose and decide which is preferred...
Question 1: Compare the possible ring
structures and conformers for fructose and decide which is
preferred (if any). There are four main hemi-ketal rings, one of
which is shown below. What factors might influence the preference
for 5- or 6-membered rings?
Question 2: Make a model of vitamin C. Note the
lactone link that forms the ring, rather than the hemi-ketal that
is present in fructose. Do you think the presence of sp2
carbons in the ring induce strain? Does...
1. a. Draw the structures of A and B (resonance structures), and C (tetrahedral intermediate). Us...
Please help!!
1. a. Draw the structures of A and B (resonance structures), and C (tetrahedral intermediate). Use curved arrows to show how each structure is formed b. Draw the structure of the Nu: you would use to make CompoundD O (tetrahedral intermediate) он c. (i) Explain why H does not react with a pi bond in the ring in Compound Z. (ii) Which resonance structure, A or B, shows why reacting H with the ketone makes the more reactive?...
A) Starting with the linear form shown in Figure 7-3a, show the cyclization reaction(s) of D-xylose...
A) Starting with the linear form shown in Figure 7-3a, show the cyclization reaction(s) of D-xylose to create all possible cyclized forms. Name the cyclized forms. Note: you can ignore the less stable four and seven membered rings. (4 marks) B) Draw and name two cyclic epimers of the D-xylose, highlighting the chiral center involved. (2 marks) C) How many asymmetric carbons (chiral centers) are there for each of the cyclised D-xylose structures in part A compared to the linear...
5. Glucose can form two different ring structures as shown. Draw a mechanism to show how...
5. Glucose can form two different ring structures as shown. Draw a mechanism to show how each is formed (don't worry about the stereochemistry around the anomeric carbon) он CHO HO HO он OH но OH он pyranose form of D-glucose OH CH2OH HO D-glucose HO но он он furanose form of D-glucose
1) SHOW WORK STEP By STEP below is Figure 7-3 Recognizing Epimers Using Figure 7-3, identify the epimers of (a) D-...
1) SHOW WORK STEP By STEP
below is Figure 7-3
Recognizing Epimers Using Figure 7-3, identify the epimers of (a) D-allose, (b) D-gulose, and (c) D-ribose at C-2, C-3, and C-4. Answer Epimers differ by the configuration about only one carbon. (a) D-altrose (C-2), D-glucose (C-3), D-gulose (C-4) (b) D-idose (C-2), D-galactose (C-3), D-allose (C-4) (c) D-arabinose (C-2), D-xylose (C-3) (a) D-Aldoses Three carbons Four carbons Five carbons но не HO -OH н-с-он CH, OH D-Glyceraldehyde но-с-н H-C-OH снион D-Threose...
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...
can you show me the mechanism steps please 1) о (2) CH SCH, (3) НA (cat.)...
can
you show me the mechanism steps please
1) о (2) CH SCH, (3) НA (cat.) НО LOH оро на сензор ОН W 1: 11 HOOCH CHCH (ә) С ен о. НО
Show the mechanism (curved arrows) for the two transformations shown below. Use H30+ as a catalyst....
Show the mechanism (curved arrows) for the two transformations shown below. Use H30+ as a catalyst. mechanism 1 mechanism 2 ОН HO OH OH НО
Answer for 1a and 1b
1. Below are the cyclic and open-chain structures for glucose and fructose. (6 points total) а) Label each structure as glucose or fructose. (1 pt each, 4 pts) b) Glucose is a(n) and fructose is a(n). (ketose, aldose) (1 pt each, 2 pts) CH,OH -он HOCH ОН HOH н но/сн,он он OH H o=4 нон Но+н н+он н+он CH2OH CH2OH с=0 но-н нон н+он Сн,он
Carbohydrates 1. Label each of the monosaccharides shown below as a triose, tetrose, pentoso, or hexose. но CH OH HT -он - он Н - ОН но -н но -Н но -н нон сньон он но -н НОН CH OH нон нон нон снон CH OH сон сон H- OH H- -он OH cң, он н-с-он Сн,он снон 2. Label each of the monosaccharides shown above as a ketose or aldose. 3. Identify all of the chiral carbons in the...
Question 1: Compare the possible ring
structures and conformers for fructose and decide which is
preferred (if any). There are four main hemi-ketal rings, one of
which is shown below. What factors might influence the preference
for 5- or 6-membered rings?
Question 2: Make a model of vitamin C. Note the
lactone link that forms the ring, rather than the hemi-ketal that
is present in fructose. Do you think the presence of sp2
carbons in the ring induce strain? Does...
Please help!!
1. a. Draw the structures of A and B (resonance structures), and C (tetrahedral intermediate). Use curved arrows to show how each structure is formed b. Draw the structure of the Nu: you would use to make CompoundD O (tetrahedral intermediate) он c. (i) Explain why H does not react with a pi bond in the ring in Compound Z. (ii) Which resonance structure, A or B, shows why reacting H with the ketone makes the more reactive?...
A) Starting with the linear form shown in Figure 7-3a, show the cyclization reaction(s) of D-xylose to create all possible cyclized forms. Name the cyclized forms. Note: you can ignore the less stable four and seven membered rings. (4 marks) B) Draw and name two cyclic epimers of the D-xylose, highlighting the chiral center involved. (2 marks) C) How many asymmetric carbons (chiral centers) are there for each of the cyclised D-xylose structures in part A compared to the linear...
5. Glucose can form two different ring structures as shown. Draw a mechanism to show how each is formed (don't worry about the stereochemistry around the anomeric carbon) он CHO HO HO он OH но OH он pyranose form of D-glucose OH CH2OH HO D-glucose HO но он он furanose form of D-glucose
1) SHOW WORK STEP By STEP
below is Figure 7-3
Recognizing Epimers Using Figure 7-3, identify the epimers of (a) D-allose, (b) D-gulose, and (c) D-ribose at C-2, C-3, and C-4. Answer Epimers differ by the configuration about only one carbon. (a) D-altrose (C-2), D-glucose (C-3), D-gulose (C-4) (b) D-idose (C-2), D-galactose (C-3), D-allose (C-4) (c) D-arabinose (C-2), D-xylose (C-3) (a) D-Aldoses Three carbons Four carbons Five carbons но не HO -OH н-с-он CH, OH D-Glyceraldehyde но-с-н H-C-OH снион D-Threose...
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...
can
you show me the mechanism steps please
1) о (2) CH SCH, (3) НA (cat.) НО LOH оро на сензор ОН W 1: 11 HOOCH CHCH (ә) С ен о. НО
Show the mechanism (curved arrows) for the two transformations shown below. Use H30+ as a catalyst. mechanism 1 mechanism 2 ОН HO OH OH НО
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