Importantly, heating of the recovered diol 3a can revert it to a racemic mixture due to the small racemization barrier (t1/2 = 36 h at 25 °C) , indicating that repeating the oxidative kinetic resolution of the racemic diol and the racemization of the recovered diol can eventually convert 100% of racemic substrate 3a into the enantio-enriched CBBC 2a.