Fig. 3. Scope of the photochemical synthesis of 2-imino-tetrahydrothiophenes.

^aReaction conditions A: 1 (0.4 mmol), 2 (0.2 mmol), PTH2 (5 mol%), and degassed toluene (2 mL) under argon with irradiation of LEDs (λ_max = 390 nm) with 100% intensity at 30–35 °C for 30 mins. Then add AlCl₃ (1 equiv.) at 0 ^oC for 1 h. ^bisolated yield. ^cfor gram scale reaction. ^daliphatic alkene used (4 equiv.) for all cases, reaction time 1 h. ^eacrylate used (1 equiv.) for all cases, reaction time 1 h.