In a carbohydrate chain structure is converted into cyclic product in the presence of H+
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 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