In 2013,El Abidine Chamas, Zein; Marchi, Enrico; Modelli, Alberto; Fort, Yves; Ceroni, Paola; Mamane, Victor published 《Highly Fluorescent, π-Extended Indenopyrido[2,1-a]isoindolone Derivatives Prepared by a Palladium-Catalysed Cascade Reaction》.European Journal of Organic Chemistry published the findings.Electric Literature of C5H3BrClN The information in the text is summarized as follows:
A new family of heterocyclic pentacyclic compounds were prepared by a cascade reaction involving 2,5-dihalopyridines and (2-formylphenyl)boronic acids. Most of the compounds exhibit high quantum yields of fluorescence in dichloromethane. In some cases, small changes in the substitution pattern caused fluorescence quenching. To rationalize this effect, a detailed photophys. study combined with electrochem. and computational studies was performed on four representative derivatives It appears that the fluorescence quenching is caused by a thermally activated nonradiative deactivation process that can be prevented in a rigid matrix such as ethanol at 77 °K or PMMA. In the experiment, the researchers used many compounds, for example, 5-Bromo-2-chloropyridine(cas: 53939-30-3Electric Literature of C5H3BrClN)
5-Bromo-2-chloropyridine(cas: 53939-30-3) belongs to pyridine. Pyridines form stable salts with strong acids. Pyridine itself is often used to neutralize acid formed in a reaction and as a basic solvent. Electric Literature of C5H3BrClN