Organic Chemistry (9th Edition)
9th Edition
ISBN: 9780321971371
Author: Leroy G. Wade, Jan W. Simek
Publisher: PEARSON
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Chapter 14, Problem 14.53SP
Interpretation Introduction
Interpretation: The mechanism of the given reaction is to be identified.
Concept introduction: In acid catalysed reaction, the proton from an acid is transferred to the reactant.
To determine: The mechanism of the given reaction.
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A carbamate can be prepared by treating an isocyanate
with an alcohol, as shown here. This type of reaction is
used to synthesize polyurethanes- polymers that have
a wide variety of industrial applications, such as surface
sealants, high-performance adhesives, and synthetic
fibers. Propose a mechanism for this transformation.
R'—ОН
R.
`N=C=0
R.
OR'
An isocyanate
A carbamate
(Substituted urethane)
O=C
Br
Brz
CH3
CH3
H3C
CH2CI2
H3C
Br
Electrophilic addition of bromine, Br2; to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion.
The reaction occurs in an anhydrous solvent such as CH,Cl).
In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due to steric clashes,
the bromide ion always attacks the carbon from the opposite face of the bromonium ion so that a product with anti stereochemistry is formed.
Draw curved arrows to show the movement of electrons in this step of the mechanism.
Arrow-pushing Instructions
Br:
:Br:
.CH3
H3C
H3C
CH3
Br:
The rate of bromination of the following three alkenes is very different: 2-methyl-1-pentene, 2-methyl-2-pentene, 3-methyl-1-pentene. Rank them in order from slowest to fastest to react.
Chapter 14 Solutions
Organic Chemistry (9th Edition)
Ch. 14.2C - Rank the given solvents in decreasing order of...Ch. 14.2D - Prob. 14.2PCh. 14.2D - In the presence of 18-crown-6, potassium...Ch. 14.3B - Give a common name (when possible) and a...Ch. 14.3C - Prob. 14.5PCh. 14.3C - Name the following heterocyclic ethers.Ch. 14.4 - Propose a fragmentation to account for each...Ch. 14.5 - Prob. 14.8PCh. 14.5 - Prob. 14.9PCh. 14.6 - Prob. 14.10P
Ch. 14.7 - Explain why bimolecular condensation is a poor...Ch. 14.7 - Prob. 14.12PCh. 14.7 - Prob. 14.13PCh. 14.8 - Prob. 14.14PCh. 14.8 - Prob. 14.15PCh. 14.8 - Prob. 14.16PCh. 14.10A - Prob. 14.17PCh. 14.10A - Prob. 14.18PCh. 14.10B - Prob. 14.19PCh. 14.11B - Show how you would accomplish the following...Ch. 14.11B - Prob. 14.21PCh. 14.12 - Prob. 14.22PCh. 14.12 - Prob. 14.23PCh. 14.12 - Prob. 14.24PCh. 14.13 - Prob. 14.25PCh. 14.13 - Prob. 14.26PCh. 14.14 - Prob. 14.27PCh. 14.15 - Give the expected products of the following...Ch. 14 - Write structural formulas for the following...Ch. 14 - Give common names for the following compounds. a....Ch. 14 - Give IUPAC names for the following compounds. a....Ch. 14 - Glycerol (propane-1,2,3-triol) is a viscous syrup...Ch. 14 - Prob. 14.33SPCh. 14 - Show how you would make the following ethers,...Ch. 14 - (A true story.) An inexperienced graduate student...Ch. 14 - Prob. 14.36SPCh. 14 - a. Show how you would synthesize the pure (R)...Ch. 14 - a. Predict the values of m/z and the structures of...Ch. 14 - The following reaction resembles the...Ch. 14 - Prob. 14.40SPCh. 14 - Prob. 14.41SPCh. 14 - Prob. 14.42SPCh. 14 - Give the structures of the intermediates...Ch. 14 - Prob. 14.44SPCh. 14 - Show how you would synthesize the following ethers...Ch. 14 - Prob. 14.46SPCh. 14 - Prob. 14.47SPCh. 14 - Prob. 14.48SPCh. 14 - An acid-catalyzed reaction was carried out using...Ch. 14 - Propylene oxide is a chiral molecule. Hydrolysis...Ch. 14 - Prob. 14.51SPCh. 14 - Prob. 14.52SPCh. 14 - Prob. 14.53SPCh. 14 - Prob. 14.54SPCh. 14 - In 2012, a group led by Professor Masayuki Satake...
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