Student Study Guide and Solutions Manual for Brown/Iverson/Anslyn/Foote's Organic Chemistry, 8th Edition
8th Edition
ISBN: 9781305864504
Author: Brent L. Iverson, Sheila Iverson
Publisher: Cengage Learning
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Textbook Question
Chapter 20, Problem 20.35P
The following triene undergoes an intramolecular Diels-Alder reaction to give a bicyclic product. Propose a structural formula for the product. Account for the observation that the Diels-Alder reaction given in this problem takes place under milder conditions (at lower temperature) than the analogous Diels-Alder reaction shown in Problem 20.34.
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The following triene undergoes an intramolecular Diels-Alder reaction to give a
bicyclic product. Propose a structural formula for the product. Account for the
observation that the Diels-Alder reaction given in this problem takes place under milder
conditions (at lower temperature) than the analogous Diels-Alder reaction
0"C
Diels-Alder adduct
Following is an example of a type of reaction known as a Diels-Alder reaction
1,3-Pentadiene
Ethylene
3-Methylcyclohexene
(a racemic mixture)
The Diels-Alder reaction between a diene and an alkene is quite remarkable in that it is
one of the few ways that chemists have to form two new carbon-carbon bonds in a single
reaction. Given what you know about the relative strengths of carbon-carbon sigma and
pi bonds, would you predict the Diels-Alder reaction to be exothermic or endothermic?
Explain your reasoning.
The following Diels-Alder reaction product is an intermediate in the synthesis of
cholesterol. Provide the structure of the major product. Show stereochemistry when
applicable.
Hint: there are two possible dienophiles, which one is the better dienophile? Provide a
brief explanation of your choice.
CH,O.
Chapter 20 Solutions
Student Study Guide and Solutions Manual for Brown/Iverson/Anslyn/Foote's Organic Chemistry, 8th Edition
Ch. 20.1 - Prob. 20.1PCh. 20.1 - Estimate the stabilization gained as a result of...Ch. 20.2 - Predict the product(s) formed by addition of one...Ch. 20.3 - Prob. 20.4PCh. 20.3 - Prob. 20.5PCh. 20.4 - Prob. 20.6PCh. 20.5 - Prob. 20.7PCh. 20.5 - Prob. 20.8PCh. 20.5 - Prob. 20.9PCh. 20.6 - Prob. 20.10P
Ch. 20.6 - Prob. 20.11PCh. 20.6 - Prob. 20.12PCh. 20 - If an electron is added to 1,3-butadiene, into...Ch. 20 - Prob. 20.15PCh. 20 - Predict the structure of the major product formed...Ch. 20 - Predict the major product formed by 1,4-addition...Ch. 20 - Predict the structure of the major 1,2-addition...Ch. 20 - Prob. 20.19PCh. 20 - Prob. 20.20PCh. 20 - Prob. 20.21PCh. 20 - Prob. 20.22PCh. 20 - Prob. 20.23PCh. 20 - Pyridine exhibits a UV transition of the type n at...Ch. 20 - Prob. 20.25PCh. 20 - Prob. 20.26PCh. 20 - Prob. 20.27PCh. 20 - Write the frontier molecular orbital analysis for...Ch. 20 - Prob. 20.29PCh. 20 - Draw structural formulas for the products of...Ch. 20 - Propose structural formulas for compounds A and B...Ch. 20 - Under certain conditions, 1,3-butadiene can...Ch. 20 - Prob. 20.33PCh. 20 - Prob. 20.34PCh. 20 - The following triene undergoes an intramolecular...Ch. 20 - Prob. 20.36PCh. 20 - Prob. 20.37PCh. 20 - Prob. 20.38PCh. 20 - Prob. 20.39PCh. 20 - The Diels-Alder reaction is not limited to making...Ch. 20 - The first step in a synthesis of dodecahedrane...Ch. 20 - Bicyclo-2,5-heptadiene can be prepared in two...Ch. 20 - Prob. 20.43PCh. 20 - Prob. 20.44PCh. 20 - Following is a retrosynthetic scheme for the...Ch. 20 - Prob. 20.46PCh. 20 - Prob. 20.47PCh. 20 - Prob. 20.48PCh. 20 - Prob. 20.49PCh. 20 - Prob. 20.50PCh. 20 - What reaction presented in this chapter is...Ch. 20 - Claisen rearrangement of an allyl phenyl ether...Ch. 20 - Prob. 20.53PCh. 20 - Prob. 20.54PCh. 20 - We now continue the use of organic chemistry...Ch. 20 - Write the products of the following sequences of...
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- When heated, allyl aryl ethers and allyl vinyl ethers undergo a reaction called a Claisen rearrangement, a concerted reorganization of bonding electrons similar to the Diels-Alder reaction. The reaction proceeds through a six-membered, cyclic transition state. Draw the structure of the expected product when this compound undergoes a Claisen rearrangement. You do not have to consider stereochemistry. For the purposes of this problem, assume that double bonds in an aromatic ring are localized at the positions indicated in the figure. Include isomerization to a phenol IF appropriate.arrow_forwardStyrene (vinylbenzene) undergoes electrophilic aromatic substitution much faster thanbenzene, and the products are found to be primarily ortho- and para-substituted styrenes.Use resonance forms of the intermediates to explain these results.arrow_forwardHow do you account for the marked difference in stability of these two ketones?arrow_forward
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