Organic Chemistry (8th Edition)
8th Edition
ISBN: 9780134042282
Author: Paula Yurkanis Bruice
Publisher: PEARSON
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Chapter 16, Problem 96P
The Baylis-Hillman reaction is a DABCO (1,4-diazabicyclo[2.2.2]octane) catalyzed reaction of an α,β-unsaturated carbonyl compound with an
![Chapter 16, Problem 96P, The Baylis-Hillman reaction is a DABCO (1,4-diazabicyclo[2.2.2]octane) catalyzed reaction of an](http://dev-ingestion-image-output.s3-website-us-east-1.amazonaws.com/9780134042282/Chapter-16/images/42282-16-96p-question-digital_image_001.png)
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If phenoxide ion is allowed to react with 1-bromopentane, pentyl phenyl ether is obtained. However, if cyclohexane is used as the alkyl halide, the major products are phenol and cyclohexene. Explain how these products were formed.
Nucleophilic aromatic substitution involves the formation of a resonance-stabilized carbanion intermediate
called a Meisenheimer complex as the nucleophile attacks the ring carbon carrying the eventual leaving
group; electron-withdrawing groups ortho and/or para to the site of attack help to stabilize this structure
via resonance.
For the reaction below, draw the structure of the stabilized reaction intermediate in the box below.
CI
F3C
CF3
NO₂
F3C
N
CF3
NO₂
• You do not have to consider stereochemistry.
• Draw the Meisenheimer complex with a formal charge of 0 on the nucleophilic atom. If more than
one resonance structure is possible, only draw the most important one.
Br2, H3O+
གོ་ཤི་ན་ཤི་
H3C CH3
CH3
CH3
Aldehydes and ketones can be halogenated at their a-position by reaction with Cl₂, Br2, or 12, under acidic conditions. Using Br2 under acidic conditions, an intermediate enol is formed which adds
bromine at the a-position. The reaction stops after the addition of one bromine because the electron-withdrawing halogen decreases the basicity of the carbonyl oxygen, making the protonation less
favorable.
Draw curved arrows to show the movement of electrons in this step of the mechanism.
Arrow-pushing Instructions
:OH
:OH
Br-Br
H3C
H3C.
Br
Br
CH₂
H₂
H3C CH3
H3C CH3
2b
Chapter 16 Solutions
Organic Chemistry (8th Edition)
Ch. 16.1 - Give two names for each of the following:Ch. 16.1 - Prob. 2PCh. 16.1 - Name the following:Ch. 16.2 - Prob. 4PCh. 16.4 - What products are formed when the following...Ch. 16.4 - We saw on the previous page that...Ch. 16.4 - a. How many stereoisomers are obtained from the...Ch. 16.4 - Prob. 9PCh. 16.4 - Write the mechanism for the reaction of acetyl...Ch. 16.4 - Prob. 11P
Ch. 16.4 - Show how the following compounds can be...Ch. 16.4 - Prob. 13PCh. 16.4 - Prob. 14PCh. 16.4 - In the mechanism for cyanohydrin formation, why is...Ch. 16.4 - Prob. 16PCh. 16.4 - Prob. 17PCh. 16.4 - Show two ways to convert an alkyl halide into a...Ch. 16.5 - Prob. 20PCh. 16.5 - Prob. 21PCh. 16.5 - Prob. 22PCh. 16.5 - Prob. 23PCh. 16.6 - Prob. 24PCh. 16.7 - What reducing agents should be used to obtain the...Ch. 16.7 - Prob. 26PCh. 16.8 - Prob. 27PCh. 16.8 - Prob. 28PCh. 16.8 - Prob. 29PCh. 16.8 - The pKa of protonated acetone is about 7.5. and...Ch. 16.8 - Prob. 31PCh. 16.8 - Prob. 32PCh. 16.8 - Prob. 33PCh. 16.8 - Excess ammonia must be used when a primary amine...Ch. 16.8 - The compounds commonly known as amino acids are...Ch. 16.9 - Hydration of an aldehyde is also catalyzed by...Ch. 16.9 - Which ketone forms the most hydrate in an aqueous...Ch. 16.9 - When trichloroacetaldehyde is dissolved in water,...Ch. 16.9 - Which of the following are a. hermiacetals? b....Ch. 16.9 - Prob. 40PCh. 16.9 - Explain why an acetal can be isolated but most...Ch. 16.10 - Prob. 42PCh. 16.10 - Prob. 43PCh. 16.10 - What products would be formed from the proceedings...Ch. 16.10 - a. In a six-step synthesis, what is the yield of...Ch. 16.10 - Show how each of the following compounds could be...Ch. 16.12 - Prob. 47PCh. 16.13 - Prob. 49PCh. 16.14 - Prob. 50PCh. 16.15 - Prob. 51PCh. 16.16 - Prob. 52PCh. 16 - Draw the structure for each of the following: a....Ch. 16 - Prob. 54PCh. 16 - Prob. 55PCh. 16 - Prob. 56PCh. 16 - a. Show the reagents required to form the primary...Ch. 16 - Prob. 58PCh. 16 - Prob. 59PCh. 16 - Using cyclohexanone as the starting material,...Ch. 16 - Propose a mechanism for each of the following...Ch. 16 - Show how each of the following compounds can be...Ch. 16 - Fill in the boxes:Ch. 16 - Prob. 64PCh. 16 - Identify A through O:Ch. 16 - Prob. 66PCh. 16 - Prob. 67PCh. 16 - Prob. 68PCh. 16 - How many signals would the product of the...Ch. 16 - Prob. 70PCh. 16 - Prob. 71PCh. 16 - Prob. 72PCh. 16 - Prob. 73PCh. 16 - Prob. 74PCh. 16 - Prob. 75PCh. 16 - Prob. 76PCh. 16 - Prob. 77PCh. 16 - Prob. 78PCh. 16 - Draw structure for A-D for each of the following:Ch. 16 - Prob. 80PCh. 16 - a. Propose a mechanism for the following reaction:...Ch. 16 - Prob. 82PCh. 16 - A compound gives the following IR spectrum. Upon...Ch. 16 - How can be following compounds be prepared from...Ch. 16 - Prob. 85PCh. 16 - Prob. 86PCh. 16 - Prob. 87PCh. 16 - In the presence of an acid catalyst, acetaldehyde...Ch. 16 - Prob. 89PCh. 16 - Prob. 90PCh. 16 - Prob. 91PCh. 16 - A compound reacts with methylmagnesium bromide...Ch. 16 - Show how each of the following compounds can be...Ch. 16 - Prob. 94PCh. 16 - The pKa values of the carboxylic acid groups of...Ch. 16 - The Baylis-Hillman reaction is a DABCO...Ch. 16 - Prob. 97PCh. 16 - Prob. 98P
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