1.1: ethanol / 20 °C 2.1: sodium hydride / N,N-dimethyl-formamide / 0.17 h / 0 °C 2.2: 5.16 h / 0 - 20 °C 3.1: dihydrogen peroxide; sodium hydroxide / ethanol / 50 °C 4.1: tris-(dibenzylideneacetone)dipalladium(0); 1,1'-bis-(diphenylphosphino)ferrocene; sodium t-butanolate / toluene / 16 h / 110 °C 5.1: hydrogenchloride / water; ethyl acetate / 3 h / 20 °C View Scheme