Wang Haobing, Wu Xia, Yang Yang, Nishiura Masayoshi, Hou Zhaomin
Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
Organometallic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
Angew Chem Int Ed Engl. 2020 Apr 27;59(18):7173-7177. doi: 10.1002/anie.201915760. Epub 2020 Mar 10.
The precise control of monomer sequence and stereochemistry in copolymerization is of much interest and importance for the synthesis of functional polymers, but studies toward this goal have met with only limited success to date. Now, the co-syndiospecific alternating copolymerization of methoxyphenyl- and N,N-dimethylaminophenyl-functionalized propylenes with styrene by half-sandwich rare-earth catalysts is reported. This reaction efficiently afforded the corresponding functionalized propylene-alt-styrene copolymers with a perfect alternating sequence and excellent co-syndiotacticity (rrrr >99 %), thus constituting the first example of co-stereospecific alternating copolymerization of polar and non-polar olefins.
在共聚反应中精确控制单体序列和立体化学对于功能聚合物的合成具有重要意义且备受关注，但迄今为止朝着这一目标开展的研究仅取得了有限的成功。现在，有报道称通过半夹心稀土催化剂实现了甲氧基苯基和N，N - 二甲基氨基苯基官能化丙烯与苯乙烯的共间同立构交替共聚。该反应高效地得到了具有完美交替序列和优异共间同立构规整度（rrrr>99%）的相应官能化丙烯 - 交替 - 苯乙烯共聚物，从而构成了极性和非极性烯烃共立体定向交替共聚的首个实例。
