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The Diels Alder reaction is an example of a cycloaddition reaction. Another possible cycloaddition reaction is the reaction of a diene with a allyl cation to give a seven membered ring. Complete the MO energy level interaction diagram shown below and determine if the reaction is allowed or forbidden.

                                   



Complete the following steps:  

a. Draw the MOs, butadiene on the left, the allyl cation on the right.

b. Indicate which levels are occupied with electrons.

c. Label each MO as symmetric or antisymmetric by circling (S) or (A) for each MO.

d. Check the appropriate blank to indicate if the reaction is allowed or forbidden.

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