(a) Show that the [ 4 + 4 ] 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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