1: tetra-(n-butyl)ammonium iodide; sodium hydride / N,N-dimethyl-formamide; mineral oil / 20 °C / Inert atmosphere 2: water; 2,3-dicyano-5,6-dichloro-p-benzoquinone / dichloromethane; tert-butyl alcohol / 3 h / 0 - 20 °C / pH 7 / aq. phosphate buffer View Scheme