ethylenediamine in tetrahydrofuran 4 h; Heating;

1: With trifluorormethanesulfonic acid; magnesium sulfate in chlorobenzene T=100°C; Friedlaender type synthesis; 1.5 h; Inert atmosphere; 2: With potassium tert-butylate in chlorobenzene T=100°C; Friedlaender type synthesis; 0.166667 h; Inert atmosphere;