) For the two dienes shown, shade in the lobes of the four molecular orbitals (on the left) and then populate the appropriate orbitals with pi electrons. Next, in the middle diagram, shade in the lobes of the highest occupied molecular orbital that is used in part a) for thermal electrocyclization. Draw the expected product in the box and explain briefly, using terms such as conrotatory and/or disrotatory, why that particular stereoisomer is formed under thermal conditions. Repeat this process in part b) for the photolytic situation. 8888 8888 8888 a) & CH3 CH3 - - ff 28 H₂C A

) For the two dienes shown, shade in the lobes of the four molecular orbitals (on the left) and then populate the appropriate orbitals with pi electrons. Next, in the middle diagram, shade in the lobes of the highest occupied molecular orbital that is used in part a) for thermal electrocyclization. Draw the expected product in the box and explain briefly, using terms such as conrotatory and/or disrotatory, why that particular stereoisomer is formed under thermal conditions. Repeat this process in part b) for the photolytic situation. 8888 8888 8888 a) & CH3 CH3 - - ff 28 H₂C A

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter20: Dienes, Conjugated Systems, And Pericyclic Reactions

Section: Chapter Questions

Problem 20.28P: Write the frontier molecular orbital analysis for the cycloaddition of butadiene with butadiene when...

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