1: 74.6 percent / aq. NaOH / diethyl ether / 1 h / Ambient temperature 2: 78.3 percent / K2CO3 / dimethylformamide / 8 h / 110 °C 3: 35 percent / 96percent aq. H2SO4 / 50 h / 110 °C 4: 1.2 g / dimethylformamide / 2 h / 110 - 120 °C View Scheme

1: 1.) NiCl2*6H2O, 2.) 2M aq. NaOH, Raney alloy, 3.) NaCN 2: 1.2 g / dimethylformamide / 2 h / 110 - 120 °C View Scheme

1: 78.3 percent / K2CO3 / dimethylformamide / 8 h / 110 °C 2: 35 percent / 96percent aq. H2SO4 / 50 h / 110 °C 3: 1.2 g / dimethylformamide / 2 h / 110 - 120 °C View Scheme

1: 35 percent / 96percent aq. H2SO4 / 50 h / 110 °C 2: 1.2 g / dimethylformamide / 2 h / 110 - 120 °C View Scheme

in N,N-dimethyl-formamide T=110 - 120°C; 2 h;