Construction of a 2,2′-biazulene framework<i>via</i>Brønsted acid-promoted annulation of 2,3-di(1-azulenyl)benzofurans
Taku Shoji, Naoko Sakata, Yukino Ariga, Akari Yamazaki, Ryuzi Katoh, Tetsuo Okujima, Ryuta Sekiguchi, Shunji Ito
Abstract
. NMR, UV-Vis, and fluorescence spectroscopies were used to investigate the structural and optical properties of the products prepared. Remarkably, the annulated products exhibited fluorescence, with the longest wavelength of azulene derivatives reported to date, which extended into the near-infrared region under acidic conditions.
Topics & Concepts
AnnulationBrønsted–Lowry acid–base theoryChemistryOrganic chemistryCombinatorial chemistryMedicinal chemistryCatalysisSynthesis and Properties of Aromatic CompoundsLuminescence and Fluorescent MaterialsPhotochromic and Fluorescence Chemistry