Expanding the Origin of Stereocontrol in Propene Polymerization Catalysis

ACS Catalysis ◽  
2016 ◽  
Vol 6 (6) ◽  
pp. 3767-3770 ◽  
Author(s):  
Claudio De Rosa ◽  
Rocco Di Girolamo ◽  
Giovanni Talarico
Keyword(s):  
Polymerization Catalysis ◽  
Propene Polymerization

scholarly journals Breaking Symmetry Rules Enhance the Options for Stereoselective Propene Polymerization Catalysis

2020 ◽  
Vol 53 (8) ◽  
pp. 2959-2964 ◽  
Author(s):  
Claudio De Rosa ◽  
Rocco Di Girolamo ◽  
Ana B. Muñoz-García ◽  
Michele Pavone ◽  
Giovanni Talarico
Keyword(s):  
Polymerization Catalysis ◽  
Propene Polymerization ◽  
Breaking Symmetry ◽  
Symmetry Rules

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

2019 ◽  
Vol 16 (3) ◽  
pp. 444-448 ◽  
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.

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

2021 ◽  
pp. 774-779
Author(s):  
Nattawut Yuntawattana ◽  
Georgina L. Gregory ◽  
Leticia Peña Carrodeguas ◽  
Charlotte K. Williams
Keyword(s):  
Polymerization Catalysis

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

2014 ◽  
Vol 21 (5) ◽  
pp. 2062-2075 ◽  
Author(s):  
Zhongbao Jian ◽  
Laura Falivene ◽  
Philipp Wucher ◽  
Philipp Roesle ◽  
Lucia Caporaso ◽  
...  
Keyword(s):  
Functional Group ◽  
Polymerization Catalysis

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

2016 ◽  
Vol 12 ◽  
pp. 1372-1379 ◽  
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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