1: N,N-dimethyl-formamide With trichlorophosphate T=0°C; Vilsmeier-Haack reaction; 0.333333 h; 2: 1-cyclohexyl-ethanone semicarbazone T=80°C; 1 h; 3: With sodium hydroxide pH=8 - 9; 0.333333 h;

1.1: 90 percent / sodium acetate / propan-2-ol / 1 h / Heating 2.1: POCl3 / 0.33 h / 0 °C 2.2: 1 h / 80 °C 2.3: 70 percent / aq. NaOH / 0.33 h / pH 8 - 9 View Scheme