Kinetic trace for the formation and decay of 3a* in the reaction between 1a* and H2O2 (10 equiv.) in the presence of AcOH (200 equiv.) and 50 (black), 150 (red), 500 (blue), and 1000 (green) equivalents of 1,4-cyclohexadiene, demonstrating that the maximum yield of 3a* depends on the amount of 1,4-cyclohexadiene present in solution.