Sequence Control from Mixtures: Switchable Polymerization Catalysis and Future Materials Applications

STIR: Redox-Switchable Olefin Polymerization Catalysis: Electronically Tunable Ligands for Controlled Polymer Synthesis

10.21236/ada579827 ◽

2013 ◽

Author(s):

Brian K. Long

Keyword(s):

Olefin Polymerization ◽

Polymer Synthesis ◽

Polymerization Catalysis ◽

Electronically Tunable

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Microwave Irradiation Syntheses and Crystal Structures of Two Series of Novel Fivemembered Heterocyclic Mono-Imine Compounds

Current Organic Synthesis ◽

10.2174/1570179416666181207125604 ◽

2019 ◽

Vol 16 (3) ◽

pp. 444-448 ◽

Cited By ~ 1

Author(s):

Biyun Su ◽

Yaning Li ◽

Dandan Pan ◽

Paison Faida ◽

Tingyu Yan ◽

...

Keyword(s):

Microwave Irradiation ◽

Aromatic Amines ◽

Imine Group ◽

Polymerization Catalysis ◽

Elementary Analysis ◽

Toluene Sulfonic Acid ◽

Ft Ir ◽

Coordination Ability ◽

Imine Compounds ◽

Late Transition

Aim and Objective: The late transition metal complexes with five-membered heterocyclic mono-imine ligands have attracted much attention because of their potential application in olefin polymerization catalysis. In order to increase the coordination ability of heteroatom N and S to center metals, CH3 group was introduced into the side arm of pyrrole imine and thiophene imine respectively, to get two series of novel five-membered heterocyclic imine compounds, mono(imino)pyrroles and mono(imino)thiophenes Materials and Methods: Two series of novel five-membered heterocyclic compounds with the mono-imine group were synthesized from the p-toluene sulfonic acid catalyzed Schiff base condensation of aromatic amines and 2-acetylpyrrole/ 2-acetylthiophene respectively, using CH3 group to substitute the common H atom on the side arm of pyrrole imine/ thiophene imine. Results: All the heterocyclic mono-imine compounds were characterized adequately by means of 1H NMR, 13C NMR, FT-IR, elementary analysis, as well as X-ray crystallographic diffraction. The reactivity differences between two precursor 2-acetylpyrrole and 2-acetylthiophene with aromatic amines were compared and discussed in detail. Conclusion: Compared to traditional heating methods, the solvent-free microwave irradiation seemed more efficient to prepare these series of five-membered heterocyclic mono-imine compounds, which resulted in a higher yield and cleaner product.

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Switchable Polymerization Catalysis Using a Tin(II) Catalyst and Commercial Monomers to Toughen Poly(l-lactide)

ACS Macro Letters ◽

10.1021/acsmacrolett.1c00216 ◽

2021 ◽

pp. 774-779

Author(s):

Nattawut Yuntawattana ◽

Georgina L. Gregory ◽

Leticia Peña Carrodeguas ◽

Charlotte K. Williams

Keyword(s):

Polymerization Catalysis

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Insights into Functional-Group-Tolerant Polymerization Catalysis with Phosphine-Sulfonamide Palladium(II) Complexes

Chemistry - A European Journal ◽

10.1002/chem.201404856 ◽

2014 ◽

Vol 21 (5) ◽

pp. 2062-2075 ◽

Cited By ~ 15

Author(s):

Zhongbao Jian ◽

Laura Falivene ◽

Philipp Wucher ◽

Philipp Roesle ◽

Lucia Caporaso ◽

...

Keyword(s):

Functional Group ◽

Polymerization Catalysis

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Molecular weight control in organochromium olefin polymerization catalysis by hemilabile ligand–metal interactions

Beilstein Journal of Organic Chemistry ◽

10.3762/bjoc.12.131 ◽

2016 ◽

Vol 12 ◽

pp. 1372-1379 ◽

Cited By ~ 5

Author(s):

Stefan Mark ◽

Hubert Wadepohl ◽

Markus Enders

Keyword(s):

Ethylene Polymerization ◽

Weight Control ◽

Transfer Reactions ◽

High Catalytic Activity ◽

Co Catalyst ◽

Metal Centers ◽

Molecular Weights ◽

Metal Interactions ◽

Polymerization Catalysis ◽

Very High

A series of Cr(III) complexes based on quinoline-cyclopentadienyl ligands with additional hemilabile side arms were prepared and used as single-site catalyst precursors for ethylene polymerization. The additional donor functions interact with the metal centers only after activation with the co-catalyst. Evidence for this comes from DFT-calculations and from the differing behavior of the complexes in ethylene polymerization. All complexes investigated show very high catalytic activity and the additional side arm minimizes chain-transfer reactions, leading to increase of molecular weights of the resulting polymers.

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