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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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
Transcribed Image Text:XIX.
Draw the ring flip for compound A and label compound B. Calculate and compare the energies of
the two conformers (A and B respectively), knowing that a methyl-methyl gauche interaction is
3.8 kJ/mol, the H-CH3 diaxial interaction is 3.75 kJ/mol and the CH3 - CH3 diaxial interaction is
15 kJ/mol. Which isomer is more stable?
4
H3C
5
CH3
A
6
2 CH3
CH3
B
Expert Solution
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Lower energy of a conformer leads to more stable in compare to higher energy conformer.
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- S T B Q The following compound exhibits two chair conformations. Draw them and indicate which one is more stable. Explain. H H CH3 H3C H3C CH3 Draw structures of nine isomers of C-He Identify the two isomers that are mirror images. Aarrow_forwardShown are two stereo representations of lactic acid. Compare the two structures shown. Determine whether they represent identical molecules or mirror images. СООН COOH HO. CH3 H3C H Determine the absolute configuration of the two structures. Left: O Right:arrow_forwardHN- H3C HN -NH "CH3 OH H. CH3 H,C. Br H3C CH3 CH3 HO. Br HO,arrow_forward
- Compare the two possible chair conformations of this molecule. Using A-values, calculate the difference in energy of the two possible chair conformations. H3C H3C Table of A-Values in kcal/mol -CH3 1.7 -ОН 0.87 -CH2CH3 1.75 -OCH3 0.67 -CH(CH3)2 2.15 -CI 0.48 -C(CH3)3 4.9 -Br 0.43arrow_forwardH8.arrow_forward40. Beginning with the Newman projection below as number 1, draw each of the six conformations for the molecule. Keep the back carbon static and rotate the front one clockwise. Number each drawing and rank them from the most stable to the least stable. Br H, Brarrow_forward
- There are four isomers of the compound shown below. Draw the chair conformation of each of the four isomers and its conformation isomers. Draw the most stable of the conformation on the left. Be sure your positioning of groups is clear.arrow_forwardWhat is the relationship (same, enantiomers, or diastereomers) between the following two molecules? You should find the absolute configuration at the stereo center to answer this question. H CH... HS CH₂OH HOH₂C H SHarrow_forward2. Assign the R or S configuration to each chiral center in the molecules below. CH2CH2B. CH3 .CO2H (H3C)3C. C=CH HO CH,F H,C=G+CH(CH,CH3)2 CH2CH,CH3 HO H C(CH3)3 ОН CH,CH,Br F"CH2Br 3 4 (numbers indicate the IUPAC numbering)arrow_forward
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