Synthesis, crystal structures and properties of carbazolebased [6]helicenes fused with an azine ring / D. I. Tonkoglazova, A. V. Gulevskaya, O. I. Askalepova, K. A. Chistyakov // Beilstein journal of organic chemistry. - 2021. - Vol. 17. - P11-21 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): AZINE-FUSED HELICENES -- CARBAZOLE-BASED [6]HELICENES -- HELICAL STRUCTURES Аннотация: Novel carbazole-based [6]helicenes fused with an azine ring (pyridine, pyrazine or quinoxaline) have been prepared through a five-step synthetic sequence in good overall yields. Commercially available 2,3-dihaloazines were used as starting materials. To discern the effect of merging an azine moiety within a helical skeleton, the X-ray structures, UV–vis absorption and fluorescence spectra of the helicenes were investigated and compared to that of the parent carbazole-based [6]helicene (7H-phenanthro[3,4-c]carbazole). |