hydrogen; potassium carbonate; palladium on activated charcoal in ethanol Catalytic hydrogenation; 3 h;

1.1: dihydrogen peroxide; potassium hydroxide / methanol; water / 0.5 h / 65 °C / Inert atmosphere 2.1: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane / Inert atmosphere 3.1: 0.5 h / Inert atmosphere 4.1: bis-triphenylphosphine-palladium(II) chloride; triethylamine; zinc(II) chloride; zinc / tetrahydrofuran / 24 h / 60 °C / Inert atmosphere 5.1: potassium hydroxide / aacetone / 2 h / Reflux; Inert atmosphere 6.1: 2,3-dicyano-5,6-dichloro-p-benzoquinone / benzene / 2 h / Inert atmosphere; Reflux 7.1: lithium aluminium tetrahydride / tetrahydrofuran / 0.33 h / 20 °C / Inert atmosphere 7.2: 20 °C View Scheme