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Pyridine push-pull derivatives as organic photocatalysts

Authors: Hloušková Zuzana | Bureš Filip

Year: 2018

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Pyridine push-pull derivatives as organic photocatalysts	Photoredox catalysis significantly pervade into the field of organic and material sciences and represent a unique tool to perform new chemical transformations. Suitable photoredox catalyst, after absorption of visible light, enables chemical transformations under mild and environmentally friendly conditions. In general, this reactions allows conversion of solar to chemical energy, which makes photoredox reactions an attractive alternative to known and established organic reactions. In 2012, X-shaped push-pull derivative based on 4,5-disubstituted pyrazine-2,3-dicarbonitrile have been developed in our group. This compound proved to efficiently catalyze various photoredox reactions, such as cross-dehydrogenative coupling, oxidation, oxidative hydroxylation, reductive dehalogenation, pH-controlled photooxygenation of indoles, and enantioselective oxidative C(sp3)-H olefinations. These encouraging results prompted us to accomplish further structural modifications with the aim to study structure-property relationship. The structural tuning involves planarization and extension of the -system by adding an additional acetylene linker and replacement of the original pyrazine-2,3-dicarbonitrile with pyridine (di)carbonitrile moieties. The donor part is represented by methoxy group. Figure 1 displays the general structure of new X- or Y- shaped photoredox catalysts. Synthesis of all catalysts, and their application in photoredox processes will be discussed.	pyridinecarbonitrile; photoredox reaction; structure-property relationship