copper T=240 - 250°C; P=1 Torr;

1: 72 percent / morpholine / methanol / 12 h / Ambient temperature 2: 78 percent / 0.5N KOH / ethanol / 5 h / Heating 3: 78 percent / Cu powder / 240 - 250 °C / 1 Torr View Scheme

1: 78 percent / 0.5N KOH / ethanol / 5 h / Heating 2: 78 percent / Cu powder / 240 - 250 °C / 1 Torr View Scheme