potassium hydroxide; hydrazine hydrate T=120 - 150°C; 4 h;

1: 86.1 percent / ethanol / 4 h / Ambient temperature 2: 5.9 percent / 37percent HCl / 2 h / Heating View Scheme

1: Im'CH2Im' With n-butyllithium in tetrahydrofuran; hexane T=-80 - -45°C; 0.5 h; 2: Diphenylphosphinemethane chloride in tetrahydrofuran; hexane T=-70 - 20°C;