1: hydrogen chloride 2: 21 g / potassium hydroxide 3: 27 g / aq. hydrochloric acid, acetic acid 4: 83 percent / sodium methoxide / methanol View Scheme

1: 0.41 g / hydrogen chloride 2: 3 mg / sodium methoxide / 0.5 h 3: aq. sodium hydroxide / ethanol 4: 1.19 g / tetrahydrothiophene 1,1-dioxide / heating, then distilling View Scheme

1: 0.41 g / hydrogen chloride 2: 3 mg / sodium methoxide / 0.5 h 3: aq. sodium hydroxide / ethanol View Scheme