1.1: potassium hydroxide / methanol / 8 h / 50 °C 2.1: palladium 10 on activated carbon; sodium carbonate / methanol; water / 78 °C / Inert atmosphere 3.1: sulfuric acid / toluene / 12 h / 78 °C / Inert atmosphere 4.1: sulfuric acid / chloroform / 20 °C 5.1: sodium hydroxide / tetrahydrofuran; ethanol / 20 °C 5.2: 1 h / Reflux View Scheme

1: bis-triphenylphosphine-palladium(II) chloride; zinc(II) chloride / 0.75 h / 55 °C 2: sodium hydroxide / methanol / 8 h / Reflux View Scheme

1.1: sulfuric acid / chloroform / 20 °C 2.1: sodium hydroxide / tetrahydrofuran; ethanol / 20 °C 2.2: 1 h / Reflux View Scheme

1.1: palladium 10 on activated carbon; sodium carbonate / methanol; water / 78 °C / Inert atmosphere 2.1: sulfuric acid / toluene / 12 h / 78 °C / Inert atmosphere 3.1: sulfuric acid / chloroform / 20 °C 4.1: sodium hydroxide / tetrahydrofuran; ethanol / 20 °C 4.2: 1 h / Reflux View Scheme

1.1: sodium hydride / N,N-dimethyl-formamide / 1 h / 0 °C 1.2: 1.5 h / 20 °C 2.1: sodium hydroxide / methanol / 8 h / |Reflux View Scheme

2: sodium hydroxide / methanol / 8 h / Reflux View Scheme