1: With boron trichloride in dichloromethane T=2 - 20°C; 52.25 h; 2: With methanol in dichloromethane T=12°C; 1.08333 h; Reflux; Product distribution / selectivity;

1: With sodium hydroxide in dichloromethane; water T=17°C; 0.25 h; 2: With hydrogenchloride in methanol; dichloromethane; water T=45 - 50°C; pH=1.5;

tetrabutylammomium bromide; sodium hydroxide in methanol; dichloromethane; water T=20°C; 16 h; Product distribution / selectivity;

aluminium trichloride in dichloromethane T=27 - 29°C; 1.5 h; Yield given;

1: 80.4 percent / KOH / ethanol; H2O; ethyl acetate / Ambient temperature 2: 69 percent / PPA / 1 h / 85 - 90 °C 3: AlCl3 / CH2Cl2 / 1.5 h / 27 - 29 °C View Scheme

1: 69 percent / PPA / 1 h / 85 - 90 °C 2: AlCl3 / CH2Cl2 / 1.5 h / 27 - 29 °C View Scheme

1: SOCl2, DMF / toluene 2: AlCl3 / CH2Cl2 / 1.5 h / 27 - 29 °C View Scheme

1: 80.4 percent / KOH / ethanol; H2O; ethyl acetate / Ambient temperature 2: 69 percent / PPA / 1 h / 85 - 90 °C 3: AlCl3 / CH2Cl2 / 1.5 h / 27 - 29 °C View Scheme

1.1: tetra(n-butyl)ammonium hydrogensulfate; potassium carbonate / ethyl acetate; water / 13 - 35 °C / Reflux 2.1: formic acid; sulfuric acid / acetic acid 3.1: thionyl chloride / N,N-dimethyl-formamide / toluene / 5 h / 65 - 70 °C 4.1: iron(III) sulfate pentahydrate; iron / toluene / 99 - 114 °C 4.2: 62 - 66 °C / Inert atmosphere 5.1: sodium hydroxide / tetrabutylammomium bromide / toluene; water / 6 h / Reflux 5.2: 20 °C 6.1: sodium hydroxide; tetrabutylammomium bromide / dichloromethane; water / 16 h / 20 °C 6.2: 2 - 51 °C View Scheme

1.1: formic acid; sulfuric acid / acetic acid 2.1: thionyl chloride / N,N-dimethyl-formamide / toluene / 5 h / 65 - 70 °C 3.1: iron(III) sulfate pentahydrate; iron / toluene / 99 - 114 °C 3.2: 62 - 66 °C / Inert atmosphere 4.1: sodium hydroxide / tetrabutylammomium bromide / toluene; water / 6 h / Reflux 4.2: 20 °C 5.1: sodium hydroxide; tetrabutylammomium bromide / dichloromethane; water / 16 h / 20 °C 5.2: 2 - 51 °C View Scheme