1: aniline With hydrogenchloride; sodium nitrite in water T=0 - 5°C; 1 h; 2: diethyl cyanosuccinate With pyridine in water T=0 - 20°C; 2 h; 3: With hydrogenchloride; sodium hydroxide more than 3 stages;

pyridine T=0 - 20°C; 2 h;