1: 3-phenyl-propenal With ammonia; iodine in tetrahydrofuran; water T=20°C; 1 h; 2: 1-cyano-guanidine With potassium hydroxide in tetrahydrofuran; water 18 h; Heating; Further stages.;

sulfuric acid Zerlegen des entstandenen Sulfats mit Soda;