1: HBr-H2SO4 / diethyl ether / Heating 2: 72 percent / sodium carbonate / methanol; H2O 3: tert-butyl hypochlorite / CH2Cl2 / 5 h 4: 26 percent / acetone / Ambient temperature View Scheme

1: 55 percent / potassium hydroxide, hydroxylamine hydrochloride / methanol 2: 72 percent / sodium carbonate / methanol; H2O 3: tert-butyl hypochlorite / CH2Cl2 / 5 h 4: 26 percent / acetone / Ambient temperature View Scheme

1: tert-butyl hypochlorite / CH2Cl2 / 5 h 2: 26 percent / acetone / Ambient temperature View Scheme

1: 72 percent / sodium carbonate / methanol; H2O 2: tert-butyl hypochlorite / CH2Cl2 / 5 h 3: 26 percent / acetone / Ambient temperature View Scheme

1: 72 percent / sodium carbonate / methanol; H2O 2: tert-butyl hypochlorite / CH2Cl2 / 5 h 3: 26 percent / acetone / Ambient temperature View Scheme

in acetone Ambient temperature;