Wilkinson's catalyst in toluene Heating;

Multi-step reaction with 2 steps 1: 1.) H2SO4, 2.) Mg, 4.) H2SO4 / 1.) 20 deg C, 3 h, 2.) THF, 75 deg C, 30 min, 3.) THF, reflux, 30 min, 4.) petroleum ether, 5 - 10 deg C, 30 min2: 1.) NBS, 2.) 1-methylpyrrolidin-2-one, 3.) PCC / 1.) CCl4, 77 deg C, 45 min, 2.) H2O, 100 h, 1h, 3.) CH2Cl2, 20 deg C, 2 h