Well-defined phosphate yttrium dialkyl complexes for catalytic stereo-controllable 1,4-polymerization of isoprene  

作　　者：Pusu Yang Hui-Zhen Du Xiang-Yu Zhang Yong-Liang Xia Jun-Tao Sun Qian Peng Bing-Tao Guan 

机构地区：[1]College of Chemistry,Nankai University,Tianjin 300071,China [2]Department of Chemistry,Fudan University,Shanghai 200438,China

出　　处：《Chinese Chemical Letters》2022年第5期2402-2406,共5页中国化学快报（英文版）

基　　金：the support from the Fudan University;supported by National Natural Science Foundation of China (Nos. 21890722 and 21950410519);National Natural Science Foundation of Tianjin (No. 19JCYBJC20100)

摘　　要：Oxygen ligation is envisioned to provide a stable and distinctive coordination environment to the strongly oxophilic rare-earth metals. However, the well-defined dialkyl complexes bearing oxyanion ancillary ligand had been rarely addressed for the instability of the complexes and the shortage of easily available ligands. Herein, we report the synthesis of phosphate ligated dialkyl yttrium complexes(PYR2) featuring a high stability and a tunable ligand. Treated with the borate reagent, the phosphate yttrium complex displays high activity and selectivity in the catalytic cis-1,4-polymerization of isoprene(up to 96.5%). Furthermore, using AlMe_(3) as an additive, the stereoselectivity switches to trans-1,4-polymerization(up to 92.0%).

关 键 词：PHOSPHATE Yttrium alkyls ISOPRENE Stereo-controllable 1 4-Polymerization 

分 类 号：TQ316.3[化学工程—高聚物工业] TQ426[理学—物理化学] O641.4[理学—化学]