hydrogenchloride 1.) Et2O, from -78 to -15 degC; 2.) reflux; Yield given. Multistep reaction;

1: 1.) NaHMDS / 1.) THF, from 0 deg C to -78 deg C, 30 min, 2.) THF, from -78 deg C to RT, 3.5 h 2: 92 percent / m-chloroperbenzoic acid (m-CPBA) View Scheme