Chapter 28: 44P (page 1212)
A student found that heating any one of the isomers shown here resulted in scrambling of the deuterium to all three positions on the five-membered ring. Propose a mechanism to account for this observation.
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Show how the reactant can be converted to the product in two steps.
Problem:Give a molecular orbital description for each of the following:
a. 1,3-pentadiene b. 1,4-pentadiene c. 1,3,5-heptatriene d. 1,3,5,8-nonatetraene
Propose a mechanism for the following reaction:
Problem:Which of the following are correct? Correct any false statements.
a. A conjugated diene with an even number of double bonds undergoes conrotatory ring closure under thermal conditions.
b. A conjugated diene with an antisymmetric HOMO undergoes conrotatory ring closure under thermal conditions.
c. A conjugated diene with an odd number of double bonds has a symmetric HOMO.
a. Identify the mode of ring closure for each of the following electrocyclic reactions.
b. Are the indicated hydrogens cis or trans?
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