in N,N-dimethyl-formamide T=35°C; 132 h;

1: 1.) aq. NaOH / 1.) toluene, 1 h, 2.) 25 deg C 2: 8.3 g / dimethylformamide / 25 °C 3: 85 percent / dimethylformamide / 132 h / 35 °C View Scheme

1: 8.3 g / dimethylformamide / 25 °C 2: 85 percent / dimethylformamide / 132 h / 35 °C View Scheme