Organic Chemistry (9th Edition)
9th Edition
ISBN: 9780321971371
Author: Leroy G. Wade, Jan W. Simek
Publisher: PEARSON
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Question
Chapter 24, Problem 24.37SP
Interpretation Introduction
Interpretation: A structure for the unknown pentapeptide is to be proposed.
Concept introduction: Pentapeptide is the peptide consisting of five amino acids. Peptide synthesis requires the formation of amide bonds between proper amino acids in proper sequence. A peptide is treated with phenyl isothiocyanate followed by acid hydrolysis.
To determine: A structure for the unknown pentapeptide.
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Consider this step in a radical reaction:
Y
What type of step is this? Check all that apply.
Draw the products of the step on the right-hand side of the drawing area
below. If more than one set of products is possible, draw any set.
Also, draw the mechanism arrows on the left-hand side of the drawing
area to show how this happens.
ionization
propagation
initialization
passivation
none of the above
22.16 The following groups are ortho-para directors.
(a)
-C=CH₂
H
(d)
-Br
(b)
-NH2
(c)
-OCHS
Draw a contributing structure for the resonance-stabilized cation formed during elec-
trophilic aromatic substitution that shows the role of each group in stabilizing the
intermediate by further delocalizing its positive charge.
22.17 Predict the major product or products from treatment of each compound with
Cl₁/FeCl₂-
OH
(b)
NO2
CHO
22.18 How do you account for the fact that phenyl acetate is less reactive toward electro-
philic aromatic substitution than anisole?
Phenyl acetate
Anisole
CH
(d)
Chapter 24 Solutions
Organic Chemistry (9th Edition)
Ch. 24.2A - Draw three-dimensional representations of the...Ch. 24.2A - Prob. 24.2PCh. 24.2B - The herbicide glyphosate (Roundup) kills plants by...Ch. 24.4 - Draw the structure of the predominant form of a....Ch. 24.4 - Draw the resonance forms of a protonated guanidino...Ch. 24.4 - Although tryptophan contains a heterocyclic amine,...Ch. 24.4 - Prob. 24.7PCh. 24.4 - Prob. 24.8PCh. 24.5A - Show how the following amino acids might be formed...Ch. 24.5B - Prob. 24.10P
Ch. 24.5C - Prob. 24.11PCh. 24.5C - Show how you would use a Strecker synthesis to...Ch. 24.6 - Suggest how you would separate the free i-ammo...Ch. 24.7A - Propose a mechanism for the acid-catalyzed...Ch. 24.7A - Give equations for the formation and...Ch. 24.7B - Prob. 24.16PCh. 24.7C - Prob. 24.17PCh. 24.8B - Draw the complete structures of the following...Ch. 24.9C - Prob. 24.19PCh. 24.9C - Prob. 24.20PCh. 24.9C - Prob. 24.21PCh. 24.9E - Prob. 24.22PCh. 24.9E - Prob. 24.23PCh. 24.10A - Propose a mechanism for the coupling of acetic...Ch. 24.10B - Show how you would synthesize Leu-Gly-Ala-Val-Phe...Ch. 24.10B - Show how solid-phase peptide synthesis would be...Ch. 24 - a. The isoelectric point (pl) of phenylalanine is...Ch. 24 - Prob. 24.28SPCh. 24 - Prob. 24.29SPCh. 24 - Prob. 24.30SPCh. 24 - Prob. 24.31SPCh. 24 - Suggest a method for the synthesis of the...Ch. 24 - Prob. 24.33SPCh. 24 - Write the complete structures for the following...Ch. 24 - The following structure is drawn in an...Ch. 24 - Prob. 24.36SPCh. 24 - Prob. 24.37SPCh. 24 - Show the steps and intermediates in the synthesis...Ch. 24 - Prob. 24.39SPCh. 24 - Lipoic acid is often found near the active sites...Ch. 24 - Prob. 24.41SPCh. 24 - Prob. 24.42SPCh. 24 - Prob. 24.43SPCh. 24 - Complete hydrolysis of an unknown basic...Ch. 24 - Prob. 24.45SPCh. 24 - Prob. 24.46SPCh. 24 - Prob. 24.47SP
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