1.1: toluene / 3 h / Heating 2.1: tetrahydrofuran / 0.08 h / -10 °C 2.2: tetrahydrofuran / 20 h / 20 °C 3.1: titanium tetrachloride / CH2Cl2 / 24 h / Heating 4.1: 84 percent / aluminum chloride / CH2Cl2 / 3 h / 30 °C 5.1: sodium hydride / dimethylformamide / 4 h / -10 °C 6.1: aq. NaOH / ethanol / Heating View Scheme

1.1: tetrahydrofuran / 0.08 h / -10 °C 1.2: tetrahydrofuran / 20 h / 20 °C 2.1: titanium tetrachloride / CH2Cl2 / 24 h / Heating 3.1: 84 percent / aluminum chloride / CH2Cl2 / 3 h / 30 °C 4.1: sodium hydride / dimethylformamide / 4 h / -10 °C 5.1: aq. NaOH / ethanol / Heating View Scheme

1: 84 percent / aluminum chloride / CH2Cl2 / 3 h / 30 °C 2: sodium hydride / dimethylformamide / 4 h / -10 °C 3: aq. NaOH / ethanol / Heating View Scheme

1: sodium hydride / dimethylformamide / 4 h / -10 °C 2: aq. NaOH / ethanol / Heating View Scheme

1: titanium tetrachloride / CH2Cl2 / 24 h / Heating 2: 84 percent / aluminum chloride / CH2Cl2 / 3 h / 30 °C 3: sodium hydride / dimethylformamide / 4 h / -10 °C 4: aq. NaOH / ethanol / Heating View Scheme

n-butyllithium in ethylene glycol dimethyl ether 1.) -35 deg C, 2.) 10 h, reflux;