1.1: sodium hydroxide / tetrabutylammomium bromide / toluene; water / 6 h / Reflux 1.2: 20 °C 2.1: sodium hydroxide; tetrabutylammomium bromide / dichloromethane; water / 16 h / 20 °C 2.2: 2 - 51 °C 3.1: boron trichloride / dichloromethane / 52.25 h / 2 - 20 °C 3.2: 1.08 h / 12 °C / Reflux View Scheme

1.1: sodium hydroxide / tetrabutylammomium bromide / toluene; water / 6 h / Reflux 1.2: 20 °C 2.1: sodium hydroxide; tetrabutylammomium bromide / dichloromethane; water / 16 h / 20 °C 2.2: 2 - 51 °C View Scheme

1.1: sodium hydroxide / tetrabutylammomium bromide / toluene; water / 6 h / Reflux 1.2: 20 °C 2.1: sodium hydroxide / dichloromethane; water / 6.75 h / 16 - 20 °C / Reflux View Scheme