(a) Show that the cycloaddition of two butadiene molecules to give cycloocta-1,5- diene
Chapter 0, Problem 15-20(choose chapter or problem)
(a) Show that the cycloaddition of two butadiene molecules to give cycloocta-1,5- diene is thermally forbidden but photochemically allowed. (b) There is a different, thermally allowed cycloaddition of two butadiene molecules. Show this reaction, and explain why it is thermally allowed. (Hint: Consider the dimerization of cyclopentadiene.)
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