ball & stick + labels stereoisomer(s) e. Are the two molecules enantiomers? yes a. How many chiral carbons are there in the molecule on the left? chiral carbon(s) b. What is the total number of stereoisomers in the group that includes the molecule on the left? stereoisomer(s) c. How many chiral carbons are there in the molecule on the right? chiral carbon(s) d. What is the total number of stereoisomers in the group that includes the molecule on the right? no ball & stick + labels Previous

ball & stick + labels stereoisomer(s) e. Are the two molecules enantiomers? yes a. How many chiral carbons are there in the molecule on the left? chiral carbon(s) b. What is the total number of stereoisomers in the group that includes the molecule on the left? stereoisomer(s) c. How many chiral carbons are there in the molecule on the right? chiral carbon(s) d. What is the total number of stereoisomers in the group that includes the molecule on the right? no ball & stick + labels Previous

Introduction to General, Organic and Biochemistry

11th Edition

ISBN:9781285869759

Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Chapter20: Carbohydrates

Section: Chapter Questions

Problem 20.58P

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Two nonsuperposable molecules are shown in the windows below: ball & stick + labels stereoisomer(s) e. Are the two molecules enantiomers? yes ball & stick a. How many chiral carbons are there in the molecule on the left? chiral carbon(s) b. What is the total number of stereoisomers in the group that includes the molecule on the left? no [References] stereoisomer(s) c. How many chiral carbons are there in the molecule on the right? chiral carbon(s) d. What is the total number of stereoisomers in the group that includes the molecule on the right? + labels Previous Next> Save and E
Two nonsuperposable molecules are shown in the windows below: ball & stick + labels stereoisomer(s) e. Are the two molecules enantiomers? ✓ a. How many chiral carbons are ere in the molecule on the left? chiral carbon(s) b. What is the total number of stereoisomers in the group that includes the molecule on the left? stereoisomer(s) c. How many chiral carbons are there in the molecule on the right? chiral carbon(s) d. What is the total number of stereoisomers in the group that includes the molecule on the right? yes no [References] ball & stick + labels Previous Next Save and Exit
O b. SN2 O c. E 2 d. SN1 О е. Е1 Label the pair of stereoisomers in Question 20 as either enantiomers, diastereomers or identical. a. Diastereomers O b. Enantiomers O C. Identical US PAGE
a) Which structures are Enantiomers? b) Which structures are Diastereomers? c) Which structures are meso compounds? Use the letters only for your answers. А. В. H H CI H H Cl C. H H D. H Cl ČI Cl CI H
What are diastereomers? a. Constitutional isomers. b. Molecules with only one chiral center. c. Stereoisomers that are not mirror images of one another and are non-superimposable on one another. d. Stereoisomers that are mirror images of one another.
2. Draw all possible stereoisomers for the following molecule. Once drawn, assign the configuration at each chiral center as R or S. Give the relationship between each stereoisomer that was drawn as enantiomers, diastereomers, or meso compound. You may build a table to give the relationship between each stereoisomer. OH ОН
Consider CH3-CH(OH)-CH(OH)(Br). a.How many stereogeniccenters are in the molecule? b.How many stereoisomers are there for the compound? c.Draw the Fischer projection for each of the stereoisomer. Label each using I, II, etc. d.Which pairs are enantiomers? Which are diastereomers? e.Determine the absolute configuration of each chiral center in one pair of diastereomer.
B4. CH₂OH H H но. H CH₂OH OH H AR Zeval O OH H H HO H O H OH OH H OH H OH H OH OH/ H H Lactose H OH НО. H OH H H Sucrose The structures of the disaccharides lactose and sucrose are shown above. a) Identify the monosaccharide residue that is common to both disaccharides. OH b) Identify and explain the diastereomeric relationship between two of the monosaccharide units in these sugars. c) Draw a simple mechanism for the lactase-catalyzed cleavage of the glycosidic bond in lactose. d) Explain why lactose and sucrose give different results in the Benedict's test.
3. Draw all possible stereoisomers for the following molecule. Once drawn, assign the configuration at each chiral center as R or S. Give the relationship between each stereoisomer that was drawn as enantiomers, diastereomers, or meso compound. You build a table to give the relationship between each stereoisomer. may SH
H3C. ОН 2 'H 3 H 4 H3C NH, How many chiral carbons are there? [ Select ] Is the molecule chiral? [ Select ] What is the configuration on C2? [Select ] What is the configuration on C3? [Select ] Does the molecule have a meso isomer? [ Select ] How many stereoisomers does the molecule have (including the one already shown)? [ Select ] If the -H and -OH on C2 switched places, the new compound will be [ Select ] with the original compound. What is the second priority substituent on C3? [ Select ]
2. Draw the optical isomers of CH3-CHOH-CHOH-CH3 . INDICATE the absolute configuration of each chiral center. Which are enantiomers? Which are diastereomers? Is there any meso compound present? Identify if yes.
H ÇI CH3-C-COOH он CH3-C-CH2Br 1. ČI a b 81. Consider the structures above. Which of these two contains a stereocenter? Draw thestructure on your answer sheet and mark the stereocenter with an asterisk. 82. Which of these two is a chiral molecule? Explain your answer. 83. Which of these two can exist as a pair of enantiomers? 84. Draw the pair of enantiomers using three-dimensional representation.