(a)
To determine: The product that is formed when given diene reacts with methyl acetylenecarboxylate, a strong dienophile.
Interpretation: The product that is formed when given diene reacts with methyl acetylenecarboxylate, a strong dienophile is to be stated.
Concept introduction: Diels-alder reaction is a cycloaddition reaction in which two molecules combine to form a new ring. In this type of reaction, syn addition takes place. It is a reaction between diene with a dienophile to yield a cyclohexene. The dienophile adds to one side of the diene, and the diene adds to the one side of the dienophile. Thus, they have syn stereochemistry. In Diels-Alder reaction, the diene behaves like an electron rich species, whereas the dienophile behaves like an electron poor species.
(b)
To determine: The path by which the strongly exothermic decarboxylation takes place.
Interpretation: The path by which the strongly exothermic decarboxylation takes place is to be stated.
Concept introduction: Diels-alder reaction is a cycloaddition reaction in which two molecules combine to form a new ring. In this type of reaction, syn addition takes place. It is a reaction between diene with a dienophile to yield a cyclohexene. The dienophile adds to one side of the diene, and the diene adds to the one side of the dienophile. Thus, they have syn stereochemistry.
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Organic Chemistry (9th Edition)
- The diene shown below will NOT react in a Diels-Alder reaction. Why not? Select one: DA. The compound is not a conjugated diene. OB. This compound cannot adopt the s-cis conformation. C. The compound is lacking in electron donating groups. ⒸD. The compound is lacking in electron withdrawing groups.arrow_forwardThe diene shown below will NOT react in a Diels-Alder reaction. Why not? Select one: A. The compound is not a conjugated diene. B. The compound is lacking in electron withdrawing groups. O C. This compound cannot adopt the s-cis conformation. D. The compound is lacking in electron donating groups.arrow_forwardFor the Diels-Alder reaction, identify the diene, the dienophile, and the Diels-Alder adduct. H3CO. R OCH3 LOCH3 R H3CO R compound A compound B compound C Compound A is a: Compound B is a: Compound C is a:arrow_forward
- Draw the structures of the diene and dienophile that yield the following enantiomeric products in the Diels-Alder reaction below: Diene: Dienophile: Do the products represent an endo or an exo addition of dienophile to diene? left product is endo, right product is exo left product is exo, right product is endo both products are endo both products are exoarrow_forwardDraw the reactants that would react to form this cyclohexene derivative in Diels-Alder reaction. Include any relevant stereochemical configurations. Show your work.arrow_forward2) a. 2,3-Di-tert-butyl-1,3-butadiene does not under go Diels-Alder reactions. Explain. b. How can you account for the fact that (Z)-1,3-pentadiene is much less reactive than (E)-1,3- pentadiene in Diels-Alder reaction?arrow_forward
- 2. Please rank the following dienophiles in their rate of reaction with the same diene in a Diels-Alder reaction (i.e. 1= fastest or most reactive dienophile, 4 = slowest or least reactive dienophile). Put your answer on the line below each structure. 3. Please rank the following dienes in their rate of reaction with the same dienophile in a Diels-Alder reaction (i.e. 1= fastest or most reactive diene, 4 = slowest or least reactive diene). Put your answer on the line below each structure. OMe OMe OMe |arrow_forwardWhy does the diene shown below fail to undergo a Diels-Alder reaction with even the most reactive dienophiles?arrow_forwardThis is a Diels-Alder reaction between furan + maleic anhydride (endo and exo products). For each cycloaddition product, draw in all hydrogen atoms, and write the molecular formula below.arrow_forward
- Please explain stepsarrow_forward4. 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.arrow_forwardDraw the conjugated diene and dienophile which can be reacted to give the Diels-Alder adduct shown belowarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning