1: 175 °C / 0.5 Torr 2: 1.) Br2, 2.) Et3N / 1.) C6H6, 1 h; 2.) C6H6, RT, 6 h 3: Se powder / 185 °C / 1 Torr / the formation of selones, investigation of twofold extrusion reaction of selones, selones as intermediates in the preparation of sterically hindered molecules ( selenadiazolines, azines) View Scheme

T=175°C; P=0.5 Torr;

T=175°C; P=0.5 Torr;

T=175°C; P=0.5 Torr;