Enantio- and Stereoselective Cyclopolymerization of Hexa-1,5-diene Catalyzed by Zirconium Complexes Possessing Optically Active Bis(phenolato) Ligands.

doi:10.1002/marc.201600351

Paper

Enantio- and Stereoselective Cyclopolymerization of Hexa-1,5-diene Catalyzed by Zirconium Complexes Possessing Optically Active Bis(phenolato) Ligands.

Published Sep 1, 2016 · N. Nakata, Takanori Watanabe, Tomoyuki Toda

Macromolecular rapid communications

Q1 SJR score

8

Citations

0

Influential Citations

Full textSemantic Scholar

Abstract

Enantio- and stereoselective cyclopolymerization of hexa-1,5-diene was achieved by enantiomerically pure dichloro zirconium(IV) pre-catalysts 2 possessing chiral [OSSO]-type bis(phenolate) ligands (-)-1 and (+)-1 in combination with dried methylaluminoxane (dMAO) as an activator. The corresponding activities were recorded with quite high values up to 1,960 g mmol(2)-1 h-1 , which are extremely larger than those of the related complexes. The microstructure analysis for the PMCPs furnished by pre-catalysts (Λ,S,S)-2 and (Δ,R,R)-2 showed good isotacticity factors (α = 75-78%) and relatively high proportions of trans-cyclopentane rings (σ = 14-21%). These enantiomeric PMCPs exhibited large specific optical rotations ([α]D = +28 to +32° from (Λ,S,S)-2, -26 to -34° from (Δ,R,R)-2).

Study Snapshot

Enantio- and stereoselective cyclopolymerization of hexa-1,5-diene was achieved by zirconium complexes with chiral bis(phenolate) ligands, resulting in high activity and good microstructure.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Sign up to use Study Snapshot

Consensus is limited without an account. Create an account or sign in to get more searches and use the Study Snapshot.

Create an account

Paper

Enantio- and Stereoselective Cyclopolymerization of Hexa-1,5-diene Catalyzed by Zirconium Complexes Possessing Optically Active Bis(phenolato) Ligands.

Sign up to use Study Snapshot

References

Highly Isospecific Polymerization of Silyl-Protected ω-Alkenols Using an [OSSO]-Type Bis(phenolato) Dichloro Zirconium(IV) Precatalyst.

This study demonstrates a highly isospecific polymerization of silyl-protected -alkenols using an [OSSO]-type bis(phenolato) chloro zirconium(IV) precatalyst, leading to functionalized polyolefins with

Highly Active and Isospecific Styrene Polymerization Catalyzed by Zirconium Complexes Bearing Aryl-substituted [OSSO]-Type Bis(phenolate) Ligands

Aryl-substituted [OSSO]-type zirconium complexes 9 and 10 can catalyze highly isospecific styrene polymerizations with high molecular weights, achieving more than 99% activity.

Extremely active α-olefin polymerization and copolymerization with ethylene catalyzed by a dMAO-activated zirconium(IV) dichloro complex having an [OSSO]-type ligand

The dMAO-activated zirconium(IV) dichloro complex with an [OSSO]-type ligand effectively catalyzes the polymerization of 1-hexene and 4-methyl-1-pentene, producing highly active -olefin polymers and copo

Neutral Methyl and Cationic Aluminum Complexes Supported by a trans-1,2-Cyclooctanediyl-Bridged [OSSO]-Type Bis(phenolato) Ligand: Synthesis, Structures, and Use in Catalysis for Propylene Oxide Polymerization

The cationic aluminum species 52+ effectively promotes propylene oxide polymerization, yielding an atactic polymer in 44% yield with low molecular weight.

Completely Isospecific Polymerization of 1-Hexene Catalyzed by Hafnium(IV) Dichloro Complex Incorporating with an [OSSO]-type Bis(phenolate) Ligand

Hafnium(IV) dichloro pre-catalyst 4 with an [OSSO]-type ligand effectively promotes isospecific 1-hexene polymerizations up to 95% with high activities and narrow polydispersities in the presence of methylaluminoxane.

Controlled Isospecific Polymerization of α-Olefins by Hafnium Complex Incorporating with a trans-Cyclooctanediyl-Bridged [OSSO]-Type Bis(phenolate) Ligand

Hafnium complex 5 with a trans-cyclooctanediyl-bridged [OSSO]-type ligand enables controlled isospecific polymerization of -olefins, producing polymers with high molecular weights and perfect isotacti

Synthesis, Structure, and 1-Hexene Polymerization Catalytic Ability of Group 5 Metal Complexes Incorporating an [OSSO]-Type Ligand

Group 5 metal complexes with an [OSSO]-type ligand successfully synthesized and catalyzed 1-hexene polymerization, providing a highly isospecific polymer with a narrow molecular weight distribution.

Titanium complexes supported by an [OSSO]-type bis(phenolato) ligand based on a trans-cyclooctanediyl platform: synthesis, structures, and 1-hexene polymerization.

The [OSSO]-type bis(phenolato) ligand supports titanium complexes with antiferromagnetic properties, which can be polymerized to produce poly(1-hexene) with high molecular weight and narrow polydispersity.

Citations

Tailoring Glass Transition Temperature in a Series of Poly(methylene-1,3-cyclopentane-stat-cyclohexane) Statistical Copolymers.

This study demonstrates that a new class of poly(methylene-1,3-cyclopentane-stat-cyclohexane) statistical copolymers can be synthesised, with their glass transition temperature increasing from -16 to 100°C with increasing 6-membered ring content.

[OSSO]-bisphenolate metal complexes: A powerful and versatile tool in polymerization catalysis

[OSSO]-bisphenolate metal complexes are a versatile tool for polymerization catalysis, promoting reactions involving traditional monomers and greener applications like CO2 utilization as a green building block.

Scandium-Catalyzed Regio- and Stereoselective Cyclopolymerization of Functionalized α,ω-Dienes and Copolymerization with Ethylene.

Scandium-catalyzed regio- and stereoselective cyclopolymerization of functionalized 1,6-heptadienes allows for controlled copolymerization with ethylene, enabling the production of complex polymers with diverse properties.

Carbazolyl-Substituted [OSSO]-Type Zirconium(IV) Complex as a Precatalyst for the Oligomerization and Polymerization of α-Olefins

The precatalyst 4 effectively promotes 1,2-regioselective oligomerization of 1-hexene and polymerization of styrene, yielding isotactic polystyrenes with high catalytic activity.

Cyclopolymerizations: Synthetic Tools for the Precision Synthesis of Macromolecular Architectures.

Cyclopolymerizations enable precision synthesis of linear, soluble macromolecules with variable ring size, driving and tuning physical properties, and enabling sequence-controlled, sequence-controlled macromolecule synthesis.