Fig. 3. (A) UV-Vis irradiation cycle of 4 in DMSO (c = ∼2 × 10−5 M). (i) irradiation to PSS with λ = 365 nm; (ii) heating to 60 °C, THI; (iii) irradiation to PSS with λ = 365 nm; (iv) heating to 100 °C, THI. (B) 1H NMR irradiation studies of 4 in DMSO-d6 (c = 2.4 × 10−3 M). (i) ES-4 before irradiation; (ii) PSS395, 52 : 48 (ES-4 : ZM-4); (iii) THI, 70 °C, 60 min; (iv) PSS395, 4 : 96 (ZS-4 : EM-4); (v) THI, 100 °C, 180 min.
