Color-tunable emissive heptagon-embedded polycyclic aromatic dicarboximides

Abstract

Heptagon-embedded polycyclic aromatic dicarboximides were developed as new push-pull fluorescent dyes through palladium-catalysed [4 + 3] annulation followed by nucleophilic substitution. The introduction of seven-membered ring in these push-pull systems...

Easy access to polyhalogenated biaryls: regioselective (di)halogenation of hypervalent bromines and chlorines

“…Attempts to tackle these challenges through late-stage halogenations, such as Sandmeyer reactions, 6 pyrylium C–N activations, 7 electrophilic aromatic substitutions (S E Ar), 8 or C–H functionalizations, 9,10 have their own distinct disadvantages and result in extended and complex synthetic sequences. Alternative approaches to construct polyhalogenated biaryls using lithium bases have also been explored, but are frequently substrate-specific and utilize harsh conditions or hazardous reagents.…”

π-Extended benzo[1,2:4,5]di[7]annulene bis(dicarboximide)s – a new class of non-alternant polycyclic aromatic dicarboximides

“…1b). 18 The former is applicable Fig. 1 Reported non-alternant imides synthesized by azulene annulation (a) and by a decarboxylative [3 + 4] annulation protocol (b).…”

“…1b ). 18 The former is applicable only for azulene-containing moieties and the latter requires corresponding rylene bis(dicarboxylic anhydride) as the starting material. Therefore, we contemplated a new more general method to annulate an aromatic imide and another aromatic building block.…”