1.1: AlCl3, aluminium chloride / dichloromethane / 17.5 h / 0 - 20 °C / Inert atmosphere 1.2: Inert atmosphere; Cooling with ice 2.1: AlCl3, aluminium chloride; bromine / chloroform / 0 °C / Inert atmosphere 2.2: 0 °C / Inert atmosphere View Scheme

1.1: triphenylphosphine-3,3',3''-trisulfonic acid trisodium salt; palladium diacetate; sodium carbonate / water; ethylene glycol / 3 h / 80 °C / Inert atmosphere; Reflux 2.1: methanol; sodium tetrahydroborate / toluene / 3 h / 50 °C / Inert atmosphere 2.2: 0.5 h / Inert atmosphere 3.1: toluene-4-sulfonic acid / toluene / 1 h / Reflux; Inert atmosphere View Scheme