EP ORGANIC CHEMISTRY -MOD.MASTERING 18W
9th Edition
ISBN: 9780136781776
Author: Wade
Publisher: PEARSON CO
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Textbook Question
Chapter 16.2, Problem 16.4P
Show the product of the Diels-Alder dimerization of cyclobutadiene. (This reaction is similar to the dimerization of cyclopentadiene, discussed in Section15-11.)
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Rank the following dienes in order of their reactivity in standard Diels-Alder reactions (1= most reactive, 4= least reactive). Be sure to briefly explain your choices.
Step 6: Now that you have determined the substrates and mechanism of a Diels-Alder reaction, you will learn how to recognize
when you should use the Diels-Alder reaction. In a synthesis reaction, if you are given a cyclohexene product with no other
obvious functional group transformations and an electron-withdrawing group two carbons away from the alkene, it is likely
made via the Diels-Alder reaction.
Deduce the structures of the starting materials to form the Diels-Alder adduct shown.
.....
CN
CN
Diene + Dienophile
The following is an example of a hetero Diels-Alder reaction, because a noncarbon atom (in this case, an N atom) is
involved in bond formation and bond breaking. Draw the curved arrows necessary to account for this transformation.
OCH3
OCH3
+
N-
Hydroquinone,
benzene,
25 °C, 90 min
86%
Chapter 16 Solutions
EP ORGANIC CHEMISTRY -MOD.MASTERING 18W
Ch. 16.2 - Prob. 16.1PCh. 16.2 - Prob. 16.2PCh. 16.2 - a. Draw the resonance forms of benzene,...Ch. 16.2 - Show the product of the Diels-Alder dimerization...Ch. 16.4 - Prob. 16.5PCh. 16.6 - Make a model of cyclooctatetraene in the tub...Ch. 16.6 - Prob. 16.7PCh. 16.6 - Prob. 16.8PCh. 16.7 - Prob. 16.9PCh. 16.8A - a. Draw the molecular orbitals for the...
Ch. 16.8A - Repeat Problem16-10 for the cyclopentadienyl ions....Ch. 16.8C - Explain why each compound or ion should be...Ch. 16.8C - The following hydrocarbon has an unusually large...Ch. 16.8C - Prob. 16.14PCh. 16.8C - Prob. 16.15PCh. 16.9B - Prob. 16.16PCh. 16.9C - Show which of the nitrogen atoms in purine are...Ch. 16.9C - The proton NMR spectrum of 2-pyridone gives the...Ch. 16.9D - Prob. 16.19PCh. 16.9D - Prob. 16.20PCh. 16.10 - Prob. 16.21PCh. 16.12 - Ciprofloxacin is a member of the fluoroquinolone...Ch. 16.13 - Draw and name all the chlorinated benzenes having...Ch. 16.13 - Name the following compounds:Ch. 16.15 - The UV spectrum of 1-phenylprop-2-en-1-ol shows an...Ch. 16 - Prob. 16.26SPCh. 16 - Name the following compounds:Ch. 16 - Draw and name all the methyl, dimethyl, and...Ch. 16 - Four pairs of compounds are shown. In each pair,...Ch. 16 - One of the following hydrocarbons is much more...Ch. 16 - In Kekuls time cyclohexane was unknown, and there...Ch. 16 - Prob. 16.32SPCh. 16 - Azulene is a deep-blue hydrocarbon with resonance...Ch. 16 - Prob. 16.34SPCh. 16 - Prob. 16.35SPCh. 16 - Prob. 16.36SPCh. 16 - Prob. 16.37SPCh. 16 - Prob. 16.38SPCh. 16 - Prob. 16.39SPCh. 16 - Biphenyl has the following structure. a. Is...Ch. 16 - Anions of hydrocarbons are rare, and dianions of...Ch. 16 - How would you convert the following compounds to...Ch. 16 - Prob. 16.43SPCh. 16 - Prob. 16.44SPCh. 16 - A student found an old bottle labeled thymol on...Ch. 16 - Prob. 16.46SPCh. 16 - Prob. 16.47SPCh. 16 - Prob. 16.48SPCh. 16 - The proton NMR chemical shifts of the hydrogens in...Ch. 16 - Prob. 16.50SPCh. 16 - NMR has been used to probe many molecular...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- Exp3: Diels-Alder reaction Why does cyclopentadiene regularly form a dimer? How to break the dimer into monomers? Does the diene in this reaction act as the nucleophile or the electrophile? Is the maleic anhydride a nucleophile or an electrophile in this reaction? Explain your reasoning.arrow_forward1. Consider the Diels-Alder cycloaddition reaction below. D heat H D = deuterium = 2H Draw the major regioisomer (or in other words, constitutional isomer) expected to form. Draw appropriate resonance structures and explain why only one constitutional isomer is expected to form. Discuss if this can be drawn with both groups on the dieneophile being endo or one has to be endo and the other has to be exo.arrow_forwardBASED ON THIS EXPERIMENT: The purpose of this experiment is to perform a Diels-Alder reaction between E,E-2,4-hexadien-1-ol and maleic anhydride in a "neat" or solventless condition. The Diels-Alder reaction is a [4+2] cycloaddition that forms a six-membered ring, typically a derivative of cyclohexene. The diene, E,E-2,4-hexadien-1-ol, and the dienophile, maleic anhydride, will be mixed and ground together, resulting in a eutectic mixture. The reaction is unique as it occurs without a solvent, contributing to a "greener" experiment. After the reaction, the product will be analyzed through mass measurements, and the mechanism involves a subsequent nucleophilic acyl substitution. QUESTION: how many carbon atoms does a dienophile contribute to the Diels-Alderadduct? How many carbon atoms does a diene contribute? draw andlabel which reagent is the diene, and which is the dienophile.arrow_forward
- [Review Topics] [References] Draw structural formulas for the diene and dienophile that combine in a Diels-Alder reaction to form the product shown. Diene + Dienophile CH3O CH₂ I wwwwwwwarrow_forwardTrue or False: Acetylene is a naturally occurring conjugated diene True or False: The Diels-Alder reaction has the stereochemistry of the dienophile is retained in the product. True or False: When looking at kinetic vs. thermodynamic products the kinetic product predominates at low temperature. True or False: the mechanism of the Diels-Alder reaction is three π bonds break; one σ bond and two π bonds form.arrow_forwardDraw the reactants that would be used to form this cyclohexene derivative in a Diels- Alder reaction. Include any relevant stereochemical configurations. Draw Diene + ·00 aarrow_forward
- A2 What is the inverse electron demand Diels–Alder reaction? Please pick a pair of a diene and a dienophile from the following dienes and dienophile that will undergo this type of reaction. Please show how this reaction works using Frontier Molecular Orbitals. What is the reaction product?arrow_forwardThis is a Diels-Alder reaction between ethylene and cis-1,3-butadiene. For each cycloaddition product, draw in all hydrogen atoms, and write the molecular formula below.arrow_forward4. Show using resonance which of the molecules below is considered an electron-donating group (EDG) and which the electron-withdrawing group (EWG): Он он vs. (a) Which dienophile above will cause a Diels-Alder reaction to proceed more rapidly with a higher yield? Briefly explain why this is the case.arrow_forward
- Of the three 1,4-diphenyl-1,3-butadiene isomers (E,E or E,Z or Z,Z) indicate the most suitable diene that can be used as a reactant in a Diels-Alder reaction. Explain your choice.arrow_forwardCompounds P and Q can undergo a Diels-Alder reaction to form two regioisomeric products R and S as shown in Figure 5. OMe O C8H12O2 R C8H12O2 S Figure 5 Draw the chemical structures of regioisomeric compounds R and S. Using possible resonance contributors of P and Q predict which of the two regioisomers will be favoured in the reaction. Using curly arrows, draw the mechanism for the reaction of P and Q to form the dominant regioisomer you have predicted in your answer to part (ii) above.arrow_forwardMechanism The Diels-Alder reaction is part of a class of reactions known as a cycloaddition reaction. This reaction is specifically a [4+2] cycloaddition which is a concerted (one-step) process in which two new carbon - carbon sigma bonds are formed from two pi bonds. For the first Diels - Alder step of the mechanism fill in the arrows needed for the transformation. The rest of the mechanism is drawn for you. OH Show mechanism arrows for this step! 4 + 2 cycloaddition OH H D- & H+ transfer OH Nuc acyl substitution H L.G.arrow_forward
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