title: Straightforward synthesis of tetraalkynylpyrazines and their photophysical properties.
abstract: Tetrafold Sonogashira reactions of tetrachloropyrazine were investigated to provide a one-step synthesis of various tetraalkynylpyrazines. The reaction conditions were thoroughly optimized using modern catalysts and ligands, and products were generally isolated in good to excellent yields. Furthermore, photophysical and electrochemical properties of selected compounds were studied and compared with those of previously reported tetraalkynylpyridines and benzenes. As a matter of fact, tetraalkynylpyrazines proved to show very promising fluorescence properties due to very high quantum yields reaching up to 0.85.
authors.affiliation: Institut für Chemie, Universität Rostock, Albert Einstein Str. 3a, 18059 Rostock, Germany. peter.langer@uni-rostock.de.
authors.forename: Andranik
authors.initials: A
authors.lastname: Petrosyan
authors.forename: Peter
authors.initials: P
authors.lastname: Ehlers
authors.forename: Annette-E
authors.initials: AE
authors.lastname: Surkus
authors.forename: Tariel V
authors.initials: TV
authors.lastname: Ghochikyan
authors.forename: Ashot S
authors.initials: AS
authors.lastname: Saghyan
authors.forename: Stefan
authors.initials: S
authors.lastname: Lochbrunner
authors.forename: Peter
authors.initials: P
authors.lastname: Langer