Wydział Chemii

Marika Żyła-Karwowska

Liliia Moshniaha

Yongseok Hong

Halina Zhylitskaya

Joanna Cybińska

Piotr J. Chmielewski

Tadeusz Lis

Dongho Kim

Marcin Stępień

2018

Chemistry-A European Journal

24

7525-7530

10.1002/chem.201801199

Naukowa

Angielski

Artykuł

Pd^II‐mediated annulative double C−H activation is shown to efficiently convert 1,n‐dipyrrolylalkanes into extensively π‐conjugated bipyrroles not accessible by conventional oxidative coupling protocols. This approach is applicable to both electron‐rich and electron‐deficient systems, and has been further developed into tandem processes involving further cyclization of substituents or oxygenation of pyrrolic α‐positions. The new bipyrrole intermediates show enhanced fluorescence as well as tunable optical properties controlled by the alignment of chromophore subunits. Photophysical data, including femtosecond transient absorptions, reveal solvent‐induced intramolecular charge transfer in their excited states, dependent on the polarity of the medium.

C-H activation, charge transfer, fluorescence, helical structures, heterocycles

https://doi.org/10.1002/chem.201801199

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