dibromoisocyanuric acid in sulfuric acid 3.5 h; Ambient temperature;

1: tin dichloride; alcoholic hydrochloric acid 2: durch Austausch von NH2 gegen Br View Scheme

sulfuric acid RefluxMolecular sieve;

1: sulfuric acid / |Reflux; |Molecular sieve 2: tin(ll) chloride / ethanol / 0.5 h / |Reflux View Scheme

1.1: thionyl chloride / -5 °C / Reflux 2.1: acetic acid; iron / tetrahydrofuran / 10 h / Reflux 2.2: 10 h / Reflux View Scheme

1.1: thionyl chloride / -5 °C / Reflux 2.1: acetic acid; iron / tetrahydrofuran / 10 h / Reflux 2.2: 10 h / Reflux 3.1: water; lithium hydroxide hydrate / ethanol / 20 h / 20 °C 3.2: pH 4 View Scheme

1.1: sulfuric acid / |Reflux; |Molecular sieve 2.1: tin(ll) chloride / ethanol / 0.5 h / |Reflux 3.1: acetic acid; sodium nitrite / water 4.1: sodium hydroxide; water / ethanol / 4 h / 20 °C 5.1: thionyl chloride / 1 h / |Reflux 5.2: 0 °C 6.1: potassium hydroxide; [bis(acetoxy)iodo]benzene / 3 h / 0 °C 7.1: water; potassium hydroxide / methanol / 48 h / |Reflux View Scheme

1: sulfuric acid / |Reflux; |Molecular sieve 2: tin(ll) chloride / ethanol / 0.5 h / |Reflux 3: acetic acid; sodium nitrite / water 4: (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; potassium acetate / methanol / 16 h / |Inert atmosphere; |Reflux View Scheme