Stiffening of the catalyst backbone of salan-type catalyst 1 via ring closure yields indanosalan 3 and increases activity and molar mass capability by two orders of magnitude.In propene polymerization,catalyst 3 is hi...Stiffening of the catalyst backbone of salan-type catalyst 1 via ring closure yields indanosalan 3 and increases activity and molar mass capability by two orders of magnitude.In propene polymerization,catalyst 3 is highly isotactic selective and nearly as active as one of the most productive known salan-catalysts today(2),showing much higher molar mass capability.NMR studies provide evidence of the identity of the active metal-polymeryl species for the catalyst pair 1/3,explaining their vast activity differences:the traditional salan catalyst 1 is trapped in the inactive mer–mer configuration,while indanosalan 3 prefers the active fac–fac isomer.展开更多
基金The work of ADA,CZ,AV,CE,RC,AM and VB forms part of the research programme of DPI,project#835the European Union-NextGenerationEU under the Italian Ministry of University and Research(MUR)National Innovation Ecosystem grant ECS00000041-VITALITY for supporting this work+1 种基金Universitàdegli Studi di Perugia and MUR for support within the project VitalityDVU,MIS,GPG,KML,and AZV thank Ministry of Science and Higher Education for support of their work(project#121021000105-7)。
文摘Stiffening of the catalyst backbone of salan-type catalyst 1 via ring closure yields indanosalan 3 and increases activity and molar mass capability by two orders of magnitude.In propene polymerization,catalyst 3 is highly isotactic selective and nearly as active as one of the most productive known salan-catalysts today(2),showing much higher molar mass capability.NMR studies provide evidence of the identity of the active metal-polymeryl species for the catalyst pair 1/3,explaining their vast activity differences:the traditional salan catalyst 1 is trapped in the inactive mer–mer configuration,while indanosalan 3 prefers the active fac–fac isomer.
