Abstract:Controlling the stereochemistry, ideally in a reversible manner using external stimuli, is of great importance and appeal for biomedical and materials applications. By incorporating a Diels‐Alder adduct into one of the heteroaromatic rings of a diarylethene, we were able to transfer the exo selectivity of the thermal Diels‐Alder reaction upon photocyclization, leading to the preferred formation of one ring‐closed exo diastereomer in a diastereomeric ratio of 90 : 10. The structures of both ring‐closed exo isom… Show more
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