Abstract
The development of new polymerization routes to afford N-heterocyclic polymers is of vital importance and highly desired for various practical applications. Herein, a facile and efficient polyannulation reaction of dual-activated alkyne and pyridines was developed to construct novel N-heterocyclic poly(quinolizine)s. This polymerization can proceed smoothly under catalyst-free conditions with 100% atom utilization to furnish poly(quinolizine)s with high molecular weights (up to 34,100) and well-defined structures in acceptable yields. The resulting polymers show good solubility, high thermal stability and strong red emission. Moreover, the prepared poly(quinolizine)s exhibit low cytotoxicity and can selectively label lysosomes in live cells. Considering the remarkable advantages of readily available raw materials, mild polymerization conditions, atom economy, and excellent product performance, this new and efficient polymerization tool will open up enormous opportunities for preparing functional N-heterocyclic polymers.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (22101028, 21788102), the start-up funding from Beijing Normal University (310432102, 310432103), the Innovation and Technology Commission (ITC-CNERC14SC01), the Science and Technology Plan of Shenzhen (JCYJ20160229205601482, JCYJ20180507183832744, JCYJ20170818113602462), the Natural Science Foundation of Guangdong Province (2019B121205002), and the Research Grants Council of Hong Kong (16305618, 16304819, 16305320, N-HKUST609/19, C6009-17G, C6014-20W/16).
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He, B., Huang, J., Zhang, J. et al. In-situ generation of poly(quinolizine)s via catalyst-free polyannulations of activated diyne and pyridines. Sci. China Chem. 65, 789–795 (2022). https://doi.org/10.1007/s11426-021-1225-4
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DOI: https://doi.org/10.1007/s11426-021-1225-4