Synthesis of Benzofuro- and Indolo[3,2‑b]indoles via Palladium-Catalyzed Double N‑Arylation and Their Physical Properties
2015-11-20T00:00:00Z (GMT) by
Two kinds of ladder-type π-conjugated compounds, benzofuro[3,2-b]indoles (BFIs) and indolo[3,2-b]indoles (IIs), were successfully synthesized using palladium-catalyzed double N-arylation of anilines with the corresponding dihalobiaryls. Photophysical properties were evaluated by UV–vis and photoluminescence spectroscopies and theoretical calculations. BFI derivatives showed higher quantum yields (33–39%) than the II derivative (29%). The absorption bands of the II derivative were more red-shifted compared to BFI derivatives.