1: 1,4-Diiodobenzene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; Bucherer-Bergs reaction; 0.25 h; 2: benzonitrile in tetrahydrofuran; hexane T=-78 - 0°C; Bucherer-Bergs reaction; 3: potassium cyanide; (NH4)2CO3 With water in tetrahydrofuran; ethanol; hexane T=70°C; Bucherer-Bergs reaction; 1 h; Microwave irradiation;