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9 used basis sets that give ex cellent results for the barrier for cyclization of the 3-butenyl radical. The high-energy point for the conversion of 1a to 3a via the pathway in Scheme 1 was 20-21 kcal/mol above the energy of radical 1a. Because 3-exo radical cyclizations have a low entropy demand, the computed barrier is nearly equal to the free energy of activation of the reaction
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9 used basis sets that give excellent results for the barrier for cyclization of the 3-butenyl radical. The high-energy point for the conversion of 1a to 3a via the pathway in Scheme 1 was 20-21 kcal/mol above the energy of radical 1a. Because 3-exo radical cyclizations have a low entropy demand, the computed barrier is nearly equal to the free energy of activation of the reaction.
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