Fig. 3
From: Oxidative [4+2] annulation of styrenes with alkynes under external-oxidant-free conditions
Intramolecular oxidative [4 + 2] annulation with respect to alkynes. Reaction conditions: styrene-yne 6 (0.2 mmol), Acr+-Mes ClO4− (3 mol%), Co(dmgH)2py2PF6 (8 mol%) in DCE (14 mL), 3W blue LEDs, 24 h; isolated yields are shown
