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Exam 20: Dienes, Conjugated Systems, and Pericyclic Reactions

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Question 21

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Consider the reaction below to answer the following question(s). Fill in the blank in the question with the appropriate letter. -The dienophile in the reaction is ____.

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Question 22

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The following spectrum could arise from π to π* transitions.

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B) False

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Question 23

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The following compound could act as a diene in a Diels-Alder reaction.

Which of the following arrangements of p atomic orbitals gives the lowest energy π-bonding molecular orbital of 1,3-butadiene?

For Diels-Alder cycloaddition reactions to take place most rapidly and in highest yield a dienophile must be substituted with electron-donating groups.

Pericyclic reactions occur in a single step with the _____.

Consider the following reaction. This is an example of a sigmatropic reaction with a [3,3]-shift.

What is the IUPAC name of the following compound?

Consider the reaction below to answer the following question(s): Enter the appropriate letter in the blank for each the following statements. -The kinetically controlled product in this reaction is _____.

How would you be able to distinguish between 1,3-cyclohexadiene and 1,4-cyclohexadiene using ultraviolet spectroscopy?

Based on the following table. $\begin{array} { | c | c | } \hline \text { Compound } & \lambda _ { \max } ( \mathbf { n m } ) \\\hline \mathrm { W } & 190 \\\hline \mathrm { X } & 340 \\\hline \mathrm { Y } & 560 \\\hline \mathrm { Z } & 250 \\\hline\end{array}$ Compound ______ has the largest energy difference between the HOMO and LUMO.

Which of the following are conjugated dienes?

What is (are) the major organic product(s) formed in the following reaction?

Which of the following laws relates absorbance to the concentration of a sample and the pathlength in ultraviolet-visible spectroscopy?

Which of the following electronic transitions is apparent in the ultraviolet-visible spectrum of 1,3-butadiene?

What is the IUPAC name of the following compound?

Consider the reaction below to answer the following question(s): Enter the appropriate letter in the blank for each the following statements. -The product that results from 1,4-addition is _____.

Which of the following is(are) formed upon addition of 1 mol of Br₂ to 1,3-cyclohexane?

Consider the reaction below to answer the following question(s). Fill in the blank in the question with the appropriate letter. -This is an example of a(n) ____________ reaction. A. sigmatropic reaction B. electrophillic addition C. Diels-Alder reaction D. Cope rearrangement

A reaction in which two reactants add together in a single step to form a cyclic product is known as a _____. ​ ​