1: 2-aminomalononitrile p-toluenesulfonate; phenylmethyl isocyanate With N-ethyl-N,N-diisopropylamine in tetrahydrofuran T=20°C; 14 h; 2: With sodium hydroxide in tetrahydrofuran; water T=50°C; 0.333333 h; 3: (isothiocyanatomethyl)-benzene With sodium hydroxide more than 3 stages;