Synthesis and chiroptical properties of helical polyallenes bearing chiral cholesteryl pendant groups |
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| Authors: | Ya‐Lan Lin Jian Huang Hui‐Qing Wang Zong‐Quan Wu |
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| Institution: | Hefei Key Laboratory of Advanced Functional Materials and Devices Department of Polymer Science and Engineering, School of Chemical Engineering, HeFei University of Technology, Hefei, People's Republic of China |
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| Abstract: | A cholesteryloxyallene (1) bearing chiral cholesteryl pendant group was designed and synthesized. Living polymerization of this monomer with an allylnickel complex as a catalyst give poly(cholesteryloxyallene)s (poly‐ 1 ms) in high yields with controllable molecular weights and narrow molecular weight distributions. These polymers were found to possess a dynamic helical conformation with a preferred handedness in n‐hexane as confirmed by circular dichroism and absorption spectra as well as optical ratios. The helical conformation of the polymers was revealed to stabilize as the number of repeat units increased until the degree of polymerization reached 100. The helical conformation of poly‐ 1 100 could be controlled by altering the temperature of solutions. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 2227–2233 |
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| Keywords: | chirality chiroptical activity helix living polymerization polyallene |
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