1: N-bromosuccinmide; Ag(1-)*C2F3O2(1-); palladium diacetate / 1,2-dichloro-ethane / 24 h / 120 °C 2: formaldehyd; toluene-4-sulfonic acid / tetrahydrofuran; water / 0.25 h / 100 °C / Microwave irradiation View Scheme

o-nitrobenzeneseleninic acid; dihydrogen peroxide T=78°C; 6 h;

o-nitrobenzeneseleninic acid; dihydrogen peroxide T=65°C; 48 h;

T=160 - 170°C;