Photoisomerization of “Partially Embedded Dihydropyridazine” with a Helical Structure
Kazuteru Usui,
Ami Amano,
Kasumi Murayama
et al.
Abstract:Herein, we report the synthesis of two “partiallyembedded fused‐dihydropyridazine N‐aryl aza[5]helicene derivatives” (PDH) and the demonstration of their intrinsic photo‐triggered multi‐functional properties based on a Kekulé biradical structure. Introducing bulky electron‐withdrawing trifluoromethyl or pentafluoroethyl groups into the aza[5]helicene framework (PDH‐CF3 and ‐C2F5) gives PDH axial chirality based on the helicity of the P and M forms, even at room temperature. Upon photo‐irradiation of PDH‐CF3 in… Show more
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