1.1: Mg(ClO4)2; 2,2-bis[(4R)-phenyl-4,5-dihydrooxazol-2-yl]propane / CH2Cl2 / 72 h / 20 °C 1.2: 4 N HCl / ethanol / 2 h / 20 °C 2.1: Cp2ZrHCl / tetrahydrofuran / 4 h / -30 - 15 °C 2.2: 75 percent / CH2Cl2 / 1 h 3.1: 4 N HCl / methanol / 24 h / 20 °C 3.2: 97 percent / KOH / H2O / 20 h / 20 °C View Scheme