Carbon Anionic Chiral Initiators for Asymmetric Anionic Polymerization of Achiral Isocyanates |
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Authors: | Wei Hu Jing Cao Yi‐Ling Huang Sai Liang |
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Affiliation: | Department College of Chemistry, Institution Xiangtan University, Xiangtan, Hunan, People's Republic of China |
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Abstract: | Novel optically active carbon anionic initiators bearing a chiral oxazole substituent on fluorene ring, (S)‐1‐(9H‐fluoren‐2‐yl)‐4‐isopropyl‐4, 5‐dihydrooxazole lithium ((S)‐1‐FIDD‐Li) and (S)‐2‐(9H‐fluoren‐2‐yl)‐4‐isopropyl‐4, 5‐dihydrooxazole lithium ((S)‐2‐FIDD‐Li), were synthesized. Anionic polymerizations of achiral polyisocyanates with the chiral initiators were investigated and optical rotation of the obtained polymers were attributed to asymmetric induction of the chiral initiators. The crowded substituent of initiator ((S)‐2‐FIDD‐Li) seems to reduce the polymerizability of isocyanates and yet enhances the chiral induced ability in polymerization. Chirality 27:449–453, 2015. © 2015 Wiley Periodicals, Inc. |
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Keywords: | carbon anionic chiral initiator oxazole isocyanate derivatives asymmetric anionic polymerization |
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