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3. What diene and dienophile should be used to synthesize the following compounds in a Diels- Alder reaction. -CN CH3. CO,CH3 C=N `CN CH ICO,CH3 H ČEN ОНС, -СНО

3. What diene and dienophile should be used to synthesize the following compounds in a Diels- Alder reaction. -CN CH3. CO,CH3 C=N `CN CH ICO,CH3 H ČEN ОНС, -СНО

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**3. Diels-Alder Reaction Synthesis** Determine the appropriate diene and dienophile combinations for synthesizing the depicted compounds via a Diels-Alder reaction. The structures shown include: - A bicyclic compound with two cyano groups (CN). - A six-membered ring with methyl (CH₃) and ester (CO₂CH₃) substituents. - A bicyclic compound with two cyano (C≡N) groups. - A bicyclic compound with a double bond and a ketone group (O). - A compound with an aldehyde (CHO) group. **4. Aromatic Character Evaluation** Assess the aromaticity of the given molecules and ions. For aromatic species, note the number of π electrons in the system. For non-aromatic species, provide a justification. Molecules include: - A heterocyclic compound with nitrogen (N) and boron (B). - A polycyclic structure resembling azulene. - A six-membered heterocycle with nitrogen (N⁺) and an additional positive charge. - A large annulene with multiple conjugated double bonds. - A bicyclic anion. - A cationic eight-membered ring structure. - A small heterocyclic compound with an oxygen atom (O). - A methyl-substituted naphthalene. Evaluate and analyze their structures for potential resonance stability and aromatic character.
Transcribed Image Text:**3. Diels-Alder Reaction Synthesis** Determine the appropriate diene and dienophile combinations for synthesizing the depicted compounds via a Diels-Alder reaction. The structures shown include: - A bicyclic compound with two cyano groups (CN). - A six-membered ring with methyl (CH₃) and ester (CO₂CH₃) substituents. - A bicyclic compound with two cyano (C≡N) groups. - A bicyclic compound with a double bond and a ketone group (O). - A compound with an aldehyde (CHO) group. **4. Aromatic Character Evaluation** Assess the aromaticity of the given molecules and ions. For aromatic species, note the number of π electrons in the system. For non-aromatic species, provide a justification. Molecules include: - A heterocyclic compound with nitrogen (N) and boron (B). - A polycyclic structure resembling azulene. - A six-membered heterocycle with nitrogen (N⁺) and an additional positive charge. - A large annulene with multiple conjugated double bonds. - A bicyclic anion. - A cationic eight-membered ring structure. - A small heterocyclic compound with an oxygen atom (O). - A methyl-substituted naphthalene. Evaluate and analyze their structures for potential resonance stability and aromatic character.
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