39.) In the pyranose form of D-glucose, the-OH on the anomeric carbon atom in the a-form...
38.) Which of the following is a pyranose ring? CH OH CH,Ho H OH OH Індон A) I only B) II only C) Both I and II are pyranose rings. D) Neither I nor II are pyranose rings. 39.) In the pyranose form of D-glucose, the-OH on the anomeric carbon atom in the a-form is to carbon 6, while in the B-form it is to carbon 6. A) trans, cis B) cis, trans C) trans, trans D) cis, cis 40.)...
5 a) identify the anomeric carbon in the below molecule
b) identify the thpe of ring pyranose or furanose
c) identify if it is a or b
6 a) identify the anomeric carbon in the below molecule
b) identify the thpe of ring pyranose or furanose
c) identify if it is a or b
7 The structure of 6-carbon ketose sugar is shown. Draw the
common cyclic structure of this structure (both a and b form)
8 Identify the relationship...
1. Draw glucose B-D-glucose in a chair form, and circle the anomeric carbon. Why is the anomeric carbon significant? 2. Why is cyclization of sugars important? What does the concept of mutarotation indicate to us about dual roles of monosaccharides? Two part question: 3. Why are monosaccharides most commonly found in pyran and furan ring forms, rather than: A) other ring motifs -(think along the lines of: why NOT 3,4, or 7 membered rings)? B) in their linear form? 4....
Draw the Haworth projection of alpha-D-galactose by labeling the pyranose ring. The anomeric carbon is shown. Labels may be used more than once.
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
Convert the Fischer projection to the Haworth projection of the B-pyranose form by moving the substituents to the appropriate positions. The anomeric carbon is shown. EK Cyclization } CH2OH Answer Bank CH,OH OH H
Which of the following reaction conditions would specifically target the anomeric carbon of the pyranose below: OH CH OH 20 НО. он HO cal. HCI H20 PaC, H2 II BnBr, NaH DMF, heat III TBDPSCI AgNO, IV HIO CH,COCH, cat. H,SO V cat. HCI CH,OH VII Pd/Baso H VIII VI O VI O O O VII O IV OV VII
1. Below is a monosaccharide in its cyclic (ring) form. OH он Linear form OH a) Is the monosaccharide the a-or the B-anomer? b) Label each carbon with its carbon number. c) Draw the linear form of this monosaccharide with the correct chirality in the box at right. 2. a) Draw the linear form of D-ribose: b) Ribose can form a pyranose ring. Draw an electron arrow on your linear ribose drawing above, indicating which nucleophile attacks which electrophile to...
b. Draw a disaccharide with two glucose linked by a(1 free anomeric OH group is in the a or ß configuration 4) linkage. Indicate whether your
Compleat molecular and structural formulas for D- fructose glucose (Colli's-Tollens' and Haworth (a and B pyranose; a and B furanose). Name all the formulas and indicate the hemiacetal hydroxyl. Write the equations of glucose interaction with: 1. Cu(OH)2; 2.HNO3; 3.CH31; 4.02. Write down what can be observed if you add sodium hydroxide solution to lactose first and then copper(II) sulfate solution (a) without heating; (b) without heating. Compleat molecular and structural formulas for a,D- fructose. Why is fructose a no...