water T=120°C; 1.5 h; Inert atmosphereSealed tube;

in water T=120°C; 1 h; Inert atmosphereSealed tube;

N,N,N',N,-tetramethylethylenediamine; oxygen; silver nitrate in acetonitrile T=60°C; 2 h;

sulfuric acid in methanol Heating;

sodium hydrogencarbonate

1: sodium hydride / N,N-dimethyl-formamide / 0.5 h / 20 °C / |Inert atmosphere 2: trifluoroacetic acid / dichloromethane / 16 h / 0 °C 3: silver trifluoromethanesulfonate / acetonitrile / 2 h / 85 °C / |Inert atmosphere View Scheme