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. 2022 Oct 12;89(1):1–8. doi: 10.1021/acs.joc.2c01830

Figure 3.

Figure 3

(a) Structure of 2 with indication of hydrogen atoms followed in 1H NMR; (b) schematic representation of the rotational cycle with indication of the color coding used for the 1H NMR spectra; and (c) selected region of the 1H NMR spectrum of (Sa)-2S in tetrachloroethane-d2 at −35 °C (top). (Sa)-2M forms upon irradiation at 365 nm, and a PSS of 68:32 ((Sa)-2M: (Sa)-2S) establishes after 1 h of irradiation (middle) and after THI after keeping in the dark at room temperature for 24 h and formation of (Ra)-2S (bottom). (d) Selected region of the 1H NMR spectrum of (Ra)-2S in tetrachloroethane-d2 at −35 °C (top), after irradiation at 365 nm for 30 min inducing formation of (Ra)-2M (middle), and after THI during keeping in the dark at 75 °C overnight, forming (Sa)-2S (bottom). Hydrogen atoms are assigned in Figure 3a.