16. Conjugated Systems

What are the products of the following reactions?

c.

The A ring of cortisone (a steroid) is formed by a Diels–Alder reaction using the two reactants shown here. What is the product of this reaction?

Which dienophile in each pair is more reactive in a Diels–Alder reaction?

2.

What is the major product when the methoxy substituent in the preceding reaction is bonded to C-2 of the diene rather than to C-1?

Which of the following statements about the $\mathrm{Diels}-\mathrm{Alder}$ reaction is true?

Which combination of diene and dienophile is required to synthesize $C_6{H}_{10}$ (cyclohexene) via a Diels-Alder reaction?

Given the reaction between $C_4{H}_6$ (1,3-butadiene) and $C_2{H}_2{O}_2$ (ethene-1,2-dione), identify the expected major product of the Diels-Alder reaction.

Which one of the following dienophiles is least reactive in the Diels-Alder reaction?

Given the following Diels-Alder product: $C_6{H}_8$ (a cyclohexene ring), which combination of diene and dienophile would most likely produce this compound?

Which of the following is the correct product of the Diels-Alder reaction between $C_4{H}_6$ (1,3-butadiene) and $C_2{H}_{2}O$ (ethene-1,2-dione)?

Which pair of diene and dienophile would react to give the following Diels-Alder product: a cyclohexene ring with a single carboxylic acid group at the $1$-position and a methyl group at the $4$-position?

Which of the following pairs of reactants would undergo a Diels-Alder reaction to produce $C_6{H}_{10}$ (cyclohexene)?

Which of the following best describes the mechanism of the Diels-Alder reaction?

Which pair of reactants would be used in a Diels-Alder reaction to synthesize the following cyclohexene derivative: $C_6{H}_{10}$ with a single double bond and a methyl group at the 1-position?