1.1: bis-triphenylphosphine-palladium(II) chloride; triethylamine; zinc(II) chloride; zinc / tetrahydrofuran / 24 h / 60 °C / Inert atmosphere 2.1: potassium hydroxide / aacetone / 2 h / Reflux; Inert atmosphere 3.1: 2,3-dicyano-5,6-dichloro-p-benzoquinone / benzene / 2 h / Inert atmosphere; Reflux 4.1: lithium aluminium tetrahydride / tetrahydrofuran / 0.33 h / 20 °C / Inert atmosphere 4.2: 20 °C View Scheme

1: bis-triphenylphosphine-palladium(II) chloride; triethylamine; zinc(II) chloride; zinc / tetrahydrofuran / 24 h / 60 °C / Inert atmosphere 2: potassium hydroxide / aacetone / 2 h / Reflux; Inert atmosphere 3: 2,3-dicyano-5,6-dichloro-p-benzoquinone / benzene / 2 h / Inert atmosphere; Reflux View Scheme