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Transition state structures and Gibbs free activation (ΔG‡) and reaction (ΔGrxn) energies in kcal/mol for the Diels–Alder reactions of 5-methyl-5-t-butyl-cyclopentadiene (TS–5), 5,5-dimethylcyclopentadiene (TS–2), and 5-methylcyclopentadiene (TS–6) with ethylene.
