The mechanistic duality of (thio)urea organocatalysts for ring-opening polymerization

2019 ◽  
Vol 17 (13) ◽  
pp. 3305-3313 ◽  
Author(s):  
Nayanthara U. Dharmaratne ◽  
Jinal U. Pothupitiya ◽  
Matthew K. Kiesewetter
Keyword(s):  
High Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Precise Control ◽  
New Applications

Dual mechanisms for H-bond mediated ring-opening polymerization allow for precise control, high activity and new applications.

Lutetium and yttrium complexes supported by an anilido-oxazoline ligand for polymerization of 1,3-conjugated dienes and ε-caprolactone

2020 ◽  
Vol 44 (1) ◽  
pp. 121-128
Author(s):  
Wenqiang Li ◽  
Xinxin Jiang ◽  
Yat-Ming So ◽  
Gaohong He ◽  
Yu Pan
Keyword(s):  
High Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Conjugated Dienes ◽  
Conjugated Diene ◽  
Yttrium Complexes

Lutetium and yttrium complexes supported by an anilido-oxazoline ligand exhibit high cis-1,4 stereoselectivity for 1,3-conjugated diene polymerization and high activity for ring-opening polymerization of ε-caprolactone.

scholarly journals High activity of an indium alkoxide complex toward ring opening polymerization of cyclic esters

2015 ◽  
Vol 51 (47) ◽  
pp. 9643-9646 ◽  
Author(s):  
Stephanie M. Quan ◽  
Paula L. Diaconescu
Keyword(s):  
Schiff Base ◽  
High Activity ◽  
Schiff Base Ligand ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Trimethylene Carbonate ◽  
Cyclic Esters ◽  
Indium Complex

An indium complex supported by a ferrocene-derived Schiff base ligand has unprecedented activity toward ε-caprolactone, δ-valerolactone, and β-butyrolactone ring-opening polymerizations. l-Lactide, d,l-lactide, and trimethylene carbonate polymerizations also showed moderate to high activity.

High‐Activity Organocatalysts for Polyether Synthesis via Intramolecular Ammonium Cation Assisted S N 2 Ring‐Opening Polymerization

2020 ◽  
Vol 132 (39) ◽  
pp. 17058-17065 ◽  
Author(s):  
Guan‐Wen Yang ◽  
Yao‐Yao Zhang ◽  
Rui Xie ◽  
Guang‐Peng Wu
Keyword(s):  
High Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Ammonium Cation

Potassium complexes supported by monoanionic tetradentate amino-phenolate ligands: synthesis, structure and catalysis in the ring-opening polymerization of rac-lactide

2017 ◽  
Vol 46 (18) ◽  
pp. 6087-6097 ◽  
Author(s):  
Chenhui Yao ◽  
Yang Yang ◽  
Shaoan Xu ◽  
Haiyan Ma
Keyword(s):  
Coordination Chemistry ◽  
High Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Phenolate Ligands

A series of potassium complexes bearing monoanionic tetradentate amino-phenolate ligands show versatile coordination chemistry and high activity in the ROP of rac-lactide.

scholarly journals Activity and stereoselectivity of Ru-based catalyst bearing a fluorinated imidazolinium ligand

2011 ◽  
Vol 9 (4) ◽  
pp. 605-609 ◽  
Author(s):  
Vincenzo Siano ◽  
Ilaria D’Auria ◽  
Fabia Grisi ◽  
Chiara Costabile ◽  
Pasquale Longo
Keyword(s):  
High Activity ◽  
Solvent Effects ◽  
Ring Opening ◽  
Methylene Chloride ◽  
Kinetic Studies ◽  
Ring Opening Polymerization ◽  
Catalyst Stability ◽  
Ring Closing Metathesis ◽  
Cross Metathesis ◽  
Very High

AbstractGrubbs II generation catalyst (3), bearing a fluorinated imidazolinium ligand, was investigated in cross metathesis (CM), ring closing metathesis (RCM) and ring opening polymerization metathesis (ROMP) for a variety of substrates. Kinetic studies showed reduced stability of the catalyst in methylene chloride following the first 15 minutes of reaction preventing a higher efficiency despite the very high activity. Beneficial solvent effects on the catalyst stability were observed by performing RCM in C6F6.

POLYMERIZATION WITHIN CONFINED NANOCHANNELS OF POROUS METAL-ORGANIC FRAMEWORKS

2013 ◽  
Vol 01 (02) ◽  
pp. 1330001 ◽  
Author(s):  
ZHIGANG HU ◽  
DAN ZHAO
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Recent Progress ◽  
Metal Organic Frameworks ◽  
Flexible Structures ◽  
Porous Metal ◽  
Ring Opening Polymerization ◽  
Coordination Polymerization ◽  
Precise Control ◽  
Metal Organic

Metal-organic frameworks (MOFs) have been increasingly investigated as templates for precise control of polymerization. Polymerizations within confined nanochannels of porous MOFs have shown unique confinement and alignment effect on polymer chain structures and thus are promising ways to achieve well-defined polymers. Herein, this review will focus on illustrating the recent progress of polymerization within confined nanochannels of MOFs, including radical polymerization, coordination polymerization, ring-opening polymerization, catalytic polymerization, etc. It will demonstrate how the heterogeneous MOF structures (pore size, pore shapes, flexible structures, and versatile functional groups) affect the polymeric products' molecular weight, molecular weight distribution, tacticity, reaction sites, copolymer sequence, etc. Meanwhile, we will highlight some challenges and foreseeable prospects on these novel polymerization methods.

High activity of rare earth tetrahydroborates for ring-opening polymerization of ω-pentadecalactone

2011 ◽  
Vol 121 (4) ◽  
pp. 2098-2103 ◽  
Author(s):  
Yuushou Nakayama ◽  
Naoki Watanabe ◽  
Keisuke Kusaba ◽  
Kenta Sasaki ◽  
Zhengguo Cai ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization
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