1: 86 percent / 1percent aq. KOH / 15 h / Ambient temperature 2: 85 percent / 1 N H2SO4, FeSO4*7H2O, tert-butyl hydroperoxide / acetic acid; H2O / 4 h / Ambient temperature 3: 82 percent / 6 N HCl / 6 h / Heating 4: 37 percent / aq. HgCl2, Al, 1 M aq. NH3 / 1.5 h / Ambient temperature View Scheme

2: 85 percent / Fe(2+), t-butylhydroperoxide, 3: 80 percent / 6M HCl, / H2O 4: Cu-Al, base, / ethanol View Scheme

With  sodium hydrogensulfide  

 

Multi-step reaction with 2 steps 1: 86 percent / 1percent aq. KOH / 15 h / Ambient temperature2: 85 percent / 1 N H2SO4, FeSO4*7H2O, tert-butyl hydroperoxide / acetic acid; H2O / 4 h / Ambient temperature  

Multi-step reaction with 3 steps 1: 86 percent / 1percent aq. KOH / 15 h / Ambient temperature2: 85 percent / 1 N H2SO4, FeSO4*7H2O, tert-butyl hydroperoxide / acetic acid; H2O / 4 h / Ambient temperature3: 82 percent / 6 N HCl / 6 h / Heating  

Multi-step reaction with 4 steps 1: 86 percent / 1percent aq. KOH / 15 h / Ambient temperature2: 85 percent / 1 N H2SO4, FeSO4*7H2O, tert-butyl hydroperoxide / acetic acid; H2O / 4 h / Ambient temperature3: 82 percent / 6 N HCl / 6 h / Heating4: 53 percent / 0.2 N NaOH, NaBH4 / 1 h / Ambient temperature