Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 28.SE, Problem 17MP
The final step in the
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It is not unexpected that the methoxyl substituent on a cyclohexane ring
prefers to adopt the equatorial conformation.
OMe
H
A G₂ = +0.6 kcal/mol
OMe
What is unexpected is that the closely related 2-methoxytetrahydropyran
prefers the axial conformation:
H
H
OMe
OMe
A Gp=-0.6 kcal/mol
Methoxy: CH3O group
Please be specific and clearly write the reason why this is observed. This effect that provides
stabilization of the axial OCH 3 group in this molecule is called the anomeric effect. [Recall in the way of
example, the staggered conformer of ethane is more stable than eclipsed owing to bonding MO
interacting with anti-bonding MO...]
206 Pb
82
Express your answers as integers. Enter your answers separated by a comma.
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VAΣ
ΜΕ ΑΣΦ
Np, N₁ = 82,126
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?
protons, neutrons
Please draw the inverted chair forms of the products for the two equilibrium reactions
shown below. Circle the equilibrium reaction that would have a AG = 0, i.e., the relative energy of
the reactant (to the left of the equilibrium arrows) equals the relative energy of the product? [No
requirement to show or do calculations.]
CH3
CH3
HH
CH3
1
-CH3
Chapter 28 Solutions
Organic Chemistry
Ch. 28.1 - Draw the full structure of the DNA dinucleotide...Ch. 28.1 - Draw the full structure of the RNA dinucleotide...Ch. 28.2 - What sequence of bases on one strand of DNA is...Ch. 28.4 - Show how uracil can form strong hydrogen bonds to...Ch. 28.4 - What RNA base sequence is complementary to the...Ch. 28.4 - From what DNA base sequence was the following RNA...Ch. 28.5 - List codon sequences for the following amino...Ch. 28.5 - List anticodon sequences on the tRNAs carrying the...Ch. 28.5 - What amino acid sequence is coded by the following...Ch. 28.5 - What is the base sequence in the original DNA...
Ch. 28.7 - Prob. 11PCh. 28.7 - Prob. 12PCh. 28.SE - Identify the following bases, and tell whether...Ch. 28.SE - Identify the following nucleotide, and tell how it...Ch. 28.SE - Amine bases in nucleic acids can react with...Ch. 28.SE - The final step in DNA synthesis is deprotection by...Ch. 28.SE - The final step in the metabolic degradation of...Ch. 28.SE - One of the steps in the biosynthesis of a...Ch. 28.SE - One of the steps in the metabolic degradation of...Ch. 28.SE - One of the steps in the biosynthesis of uridine...Ch. 28.SE - Human brain natriuretic peptide (BNP) is a small...Ch. 28.SE - Human and horse insulin both have two polypeptide...Ch. 28.SE - The DNA of sea urchins contains about 32% A. What...Ch. 28.SE - The codon UAA stops protein synthesis. Why does...Ch. 28.SE - Which of the following base sequences would most...Ch. 28.SE - For what amino acids do the following...Ch. 28.SE - Prob. 27APCh. 28.SE - Prob. 28APCh. 28.SE - Draw the complete structure of the ribonucleotide...Ch. 28.SE - Draw the complete structure of the...Ch. 28.SE - Give an mRNA sequence that will code for the...Ch. 28.SE - Give an mRNA sequence that will code for the...Ch. 28.SE - What amino acid sequence is coded for by the...Ch. 28.SE - What amino acid sequence is coded for by the...Ch. 28.SE - Prob. 35APCh. 28.SE - Show the steps involved in a laboratory synthesis...Ch. 28.SE - Draw the structure of cyclic adenosine...Ch. 28.SE - Prob. 38AP
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