Figure 3.

Photoswitching cycles of oxidized HTI derivatives in solution as followed by ¹H NMR spectroscopy starting from pure Z isomers. Signals of photogenerated E isomers are highlighted in red for HTI‐SOs and in blue for HTI‐SO₂s. a) Photoswitching of HTI‐SO 3 with blue (470 nm) and green (530 nm) light in [D₈]toluene solution. b) Photoswitching of HTI‐SO 4 with UV (365 nm) and blue (435 nm) light in CD₂Cl₂ solution. c) Photoswitching of HTI‐SO₂ 2 with UV (365 nm) and blue (435 nm) light in CD₂Cl₂ solution. d) Photoswitching of HTI−SO₂ 4 with UV (365 nm) and blue (435 nm) light in CD₂Cl₂ solution.