1.1: sodium hydroxide / water / 0.5 h 1.2: 6.25 h / 0 - 70 °C 2.1: dihydrogen peroxide / methanol; water / 4 h / 5 - 10 °C 3.1: potassium carbonate / N,N-dimethyl-formamide / 0.5 h 3.2: 3.5 h / 5 - 20 °C 4.1: ammonia / ethanol; water / 6 h / 90 °C / Autoclave 5.1: sodium dithionite / methanol; water / 12 h / Reflux 6.1: sodium hydride / N,N-dimethyl-formamide; mineral oil / 1 h / 0 °C 6.2: 12 h / 0 - 20 °C 7.1: sodium hydroxide / methanol; water / 3 h / Reflux 7.2: pH 5 View Scheme

1.1: dihydrogen peroxide / methanol; water / 4 h / 5 - 10 °C 2.1: potassium carbonate / N,N-dimethyl-formamide / 0.5 h 2.2: 3.5 h / 5 - 20 °C 3.1: ammonia / ethanol; water / 6 h / 90 °C / Autoclave 4.1: sodium dithionite / methanol; water / 12 h / Reflux 5.1: sodium hydride / N,N-dimethyl-formamide; mineral oil / 1 h / 0 °C 5.2: 12 h / 0 - 20 °C 6.1: sodium hydroxide / methanol; water / 3 h / Reflux 6.2: pH 5 View Scheme

1.1: sodium hydroxide / water / 6.5 h / 60 °C 2.1: nitric acid / 1.67 h / -15 °C 3.1: sodium hydroxide / water / 0.5 h 3.2: 6.25 h / 0 - 70 °C 4.1: dihydrogen peroxide / methanol; water / 4 h / 5 - 10 °C 5.1: potassium carbonate / N,N-dimethyl-formamide / 0.5 h 5.2: 3.5 h / 5 - 20 °C 6.1: ammonia / ethanol; water / 6 h / 90 °C / Autoclave 7.1: sodium dithionite / methanol; water / 12 h / Reflux 8.1: sodium hydride / N,N-dimethyl-formamide; mineral oil / 1 h / 0 °C 8.2: 12 h / 0 - 20 °C 9.1: sodium hydroxide / methanol; water / 3 h / Reflux 9.2: pH 5 View Scheme

1.1: chlorine / dichloromethane / 15 h / 20 - 25 °C 2.1: sodium hydroxide; tetra(n-butyl)ammonium hydrogensulfate / water / 4 h / 80 - 85 °C 3.1: sodium hydroxide / butan-1-ol / 15 h / 123 - 126 °C 3.2: 80 °C / pH 8 3.3: 80 - 85 °C / pH 6 View Scheme