1: 3-chloro-3-p-tolyl-acrylonitrile With sodium sulfide in N,N-dimethyl-formamide T=55°C; 1.5 h; 2: monobromonitromethane in N,N-dimethyl-formamide T=55°C; 1.5 h; 3: With sodium hydroxide in water; N,N-dimethyl-formamide T=55°C; 0.5 h; Further stages.;