Unsymmetrical diarylamido-based rare-earth alkyl complexes: their synthesis and catalytic performance in isoprene polymerization
Wenhui Ren, Hui Liu, Fen You, Pengjuan Mao, Yat‐Ming So, Xiaohui Kang, Xiaochao Shi
Abstract
], the scandium (P-Sc and S-Sc) and yttrium complexes (P-Y and S-Y) could catalyze the polymerization of isoprene with cis-1,4 selectivity (up to 98.8%), while the lutetium analogues P-Lu and S-Lu produced trans-1,4 selective polyisoprene (up to 83.3%). Density functional theory (DFT) calculations were carried out to clarify the mechanisms for the metal-dependent stereoselective (cis to trans) polymerization of isoprene catalyzed by P-Sc, P-Y and P-Lu, suggesting that kinetically and thermodynamically more favorable insertion-isomerization during chain propagation is the key reason for P-Lu catalyzed trans-stereoselective isoprene polymerization.
Topics & Concepts
IsoprenePolymerizationAlkylRare earthCatalysisChemistryStereoselectivityEarth (classical element)Polymer chemistryOrganic chemistryCopolymerPolymerMineralogyPhysicsMathematical physicsOrganometallic Complex Synthesis and CatalysisLanthanide and Transition Metal ComplexesCarbon dioxide utilization in catalysis