Abstract

Novel thiophenophan-1-enes, which are composed of a dithienylethene unit and a chiral bridge, were synthesized and obtained as optically-active single diastereomers. Upon UV irradiation, the open-form isomers afforded single diastereomers of the closed form in 100% diastereo-excess, indicating that this system undergoes a fully diastereospecific photochromic reaction.

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