## Answers

14. Using FMO theory, determine whether the cycloaddition drawn is symmetry-allowed or symmetry forbidden. Show all work including molecular orbital interactions.

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Hint: Draw the LUMO of the allylic cabocation and the HOMO of 1,3-butadiene. -CH₂ Н.С ECH2 heat Thermally allowed HOMO of 1,3-butadiene LUMO of allyl supra-supra, thermally and symmetrically allowed

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