1: p-aminobenzonitrile With hydrogenchloride; sodium nitrite in water T=0 - 5°C; 2: With sodium tetrafluoroborate in water T=5°C; 3: 4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl-4',4',5',5'-tetramethyl-1,3,2-dioxaborolane With copper(I) bromide in water; acetonitrile T=20°C; Sandmeyer type reaction; 3 h;
