sulfuric acid in acetone T=15°C; 2.5 h;

1.1: sodium hydrogencarbonate / methanol / 3 h / |Reflux; |Green chemistry 2.1: N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide / water; butan-1-ol / 12 h / |Reflux; |Green chemistry 3.1: N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide / methanol; water / 0.5 h / 10 - 40 °C / |Reflux; |Green chemistry 3.2: 12 h / 40 °C / |Green chemistry 4.1: (-)-10-CSA / water; toluene / 49 h / 20 - 50 °C / |Green chemistry 5.1: sulfuric acid / 12 h / 0 °C / |Green chemistry View Scheme

1.1: N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide / water; butan-1-ol / 12 h / |Reflux; |Green chemistry 2.1: N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide / methanol; water / 0.5 h / 10 - 40 °C / |Reflux; |Green chemistry 2.2: 12 h / 40 °C / |Green chemistry 3.1: (-)-10-CSA / water; toluene / 49 h / 20 - 50 °C / |Green chemistry 4.1: sulfuric acid / 12 h / 0 °C / |Green chemistry View Scheme

1.1: bromine / neat (no solvent) / 6 h / 105 - 110 °C / |Green chemistry 2.1: sodium hydrogencarbonate / methanol / 3 h / |Reflux; |Green chemistry 3.1: N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide / water; butan-1-ol / 12 h / |Reflux; |Green chemistry 4.1: N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide / methanol; water / 0.5 h / 10 - 40 °C / |Reflux; |Green chemistry 4.2: 12 h / 40 °C / |Green chemistry 5.1: (-)-10-CSA / water; toluene / 49 h / 20 - 50 °C / |Green chemistry 6.1: sulfuric acid / 12 h / 0 °C / |Green chemistry View Scheme

1.1: N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide / methanol; water / 12 h / |Reflux; |Green chemistry 2.1: N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide / methanol; water / 0.5 h / 10 - 40 °C / |Reflux; |Green chemistry 2.2: 12 h / 40 °C / |Green chemistry 3.1: (-)-10-CSA / water; toluene / 49 h / 20 - 50 °C / |Green chemistry 4.1: sulfuric acid / 12 h / 0 °C / |Green chemistry View Scheme

1.1: N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide / methanol; water / 0.5 h / 10 - 40 °C / |Reflux; |Green chemistry 1.2: 12 h / 40 °C / |Green chemistry 2.1: (-)-10-CSA / water; toluene / 49 h / 20 - 50 °C / |Green chemistry 3.1: sulfuric acid / 12 h / 0 °C / |Green chemistry View Scheme

1.1: sodium hydrogencarbonate / toluene / 25 - 30 °C 1.2: 85 - 90 °C 2.1: water / 25 - 35 °C 2.2: pH 7 - 8 3.1: sulfuric acid / acetone; methanol / 0 - 30 °C View Scheme

1.1: sodium hydrogencarbonate / toluene / 25 - 30 °C 1.2: 85 - 90 °C 2.1: water / 25 - 35 °C 2.2: pH 7 - 8 3.1: sulfuric acid / acetone; methanol / 0 - 30 °C View Scheme

1.1: sodium carbonate / methanol / 1 h / 60 - 65 °C 1.2: 24 h / 60 - 65 °C 2.1: dichloromethane; ethyl acetate / 6 h / 20 - 45 °C 3.1: potassium carbonate / dichloromethane; water / 0.67 h / 10 °C 4.1: sulfuric acid / water; Sec-butyl alcohol / 0.5 h / 20 - 25 °C View Scheme

1.1: sodium carbonate / methanol / 1 h / 60 - 65 °C 1.2: 24 h / 60 - 65 °C 2.1: dichloromethane; ethyl acetate / 6 h / 20 - 45 °C 3.1: potassium carbonate / dichloromethane; water / 0.67 h / 10 °C 4.1: sulfuric acid / water; Sec-butyl alcohol / 0.5 h / 20 - 25 °C View Scheme