trans-3,4-Dimethylcyclobutene can open by two conrotatory paths to give either
Chapter 30, Problem 30(choose chapter or problem)
trans-3,4-Dimethylcyclobutene can open by two conrotatory paths to give either (2E,4E)-2,4-hexadiene or (2Z,4Z)-2,4-hexadiene. Explain why both products are symmetry-allowed, and then account for the fact that only the 2E,4E isomer is obtained in practice.
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