Fig. 4: Scope of the Ag3PO4 photocatalysis in the radical cation pericyclic reactions.

aConditions for homo [2 + 2] reactions: substrate, 1.0 mmol; Ag3PO4, 27 mg (0.12 equiv); 12–18 h. bConditions for hetero [2 + 2] reactions: 1a, 0.5 mmol; the counterpart, 1.0 mmol; Ag3PO4, 44 mg (0.20 equiv); 12 h. cConditions for intramolecular [2 + 2] reactions: substrate, 0.3 mmol; Ag3PO4, 12 mg (0.10 equiv); 12 h. dConditions for [4 + 2] reactions: aromatic alkene, 1.0 mmol; diene, 2.0 mmol; Ag3PO4, 32 mg (0.08 equiv); 8 h.