Versatile catalytic systems based on complexes of zinc, magnesium and calcium supported by a bulky bis(morpholinomethyl)phenoxy ligand for the large-scale immortal ring-opening polymerisation of cyclic esters

2009 ◽  
pp. 9820 ◽  
Author(s):  
Valentin Poirier ◽  
Thierry Roisnel ◽  
Jean-François Carpentier ◽  
Yann Sarazin
Keyword(s):  
Ring Opening ◽  
Large Scale ◽  
Catalytic Systems ◽  
Cyclic Esters

Heterogeneous catalysts based on built-in N-heterocyclic carbenes with high removability, recoverability and reusability for ring-opening polymerization of cyclic esters

2019 ◽  
Vol 10 (12) ◽  
pp. 1526-1536 ◽  
Author(s):  
Wen Liu ◽  
Guo-Qiang Tian ◽  
Dan-Dan Yang ◽  
Gang Wu ◽  
Si-Chong Chen ◽  
...  
Keyword(s):  
Ring Opening ◽  
Heterogeneous Catalysts ◽  
Ring Opening Polymerization ◽  
Heterocyclic Carbenes ◽  
Catalytic Systems ◽  
Cyclic Esters ◽  
Metal Free ◽  
Critical Issues ◽  
New Generation

Both activity and reusability are critical issues for developing new generation metal-free catalytic systems.

scholarly journals Application of Diethylzinc/propyl Gallate Catalytic System for Ring-Opening Copolymerization of rac-Lactide and ε-Caprolactone

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4168 ◽  
Author(s):  
Wyrębiak ◽  
Oledzka ◽  
Figat ◽  
Sobczak
Keyword(s):  
Catalytic System ◽  
Propyl Gallate ◽  
Ring Opening ◽  
Reaction Conditions ◽  
Catalytic Systems ◽  
Cyclic Esters ◽  
Biomedical Polymers ◽  
Low Toxicity ◽  
High Yields ◽  
Polymerization Method

Biodegradable polyesters gain significant attention because of their wide potential biomedical applications. The ring-opening polymerization method is widely used to obtain such polymers, due to high yields and advantageous properties of the obtained material. The preparation of new, effective, and bio-safe catalytic systems for the synthesis of biomedical polymers is one of the main directions of the research in modern medical chemistry. The new diethylzinc/propyl gallate catalytic system was first used in the copolymerization of ε-caprolactone and rac-lactide. In this paper, the activity of the new zinc-based catalytic system in the copolymerization of cyclic esters depending on the reaction conditions was described. The microstructure analysis of the obtained copolyesters and their toxicity studies were performed. Resulted copolyesters were characterized by low toxicity, moderate dispersity (1.19–1.71), varying randomness degree (0.18–0.83), and average molar mass (5300–9800 Da).

A switchable dimeric yttrium complex and its three catalytic states in ring opening polymerization

2021 ◽  
Author(s):  
Shijie Deng ◽  
Paula L. Diaconescu
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Oxidation States ◽  
Cyclic Esters

A dimeric yttrium phenoxide complex can be oxidized in a stepwise fashion to access three oxidation states. The three states show different activity in the ring opening polymerization of cyclic esters and epoxides.

Controlling polymer stereochemistry in ring-opening polymerization: a decade of advances shaping the future of biodegradable polyesters

2021 ◽  
Author(s):  
Mathieu J.-L. Tschan ◽  
Régis M. Gauvin ◽  
Christophe M. Thomas
Keyword(s):  
Biodegradable Polymer ◽  
Ring Opening ◽  
Polymer Synthesis ◽  
Ring Opening Polymerization ◽  
Cyclic Esters ◽  
Biodegradable Polyesters ◽  
The Future ◽  
Recent Developments

In this review, we describe recent developments in biodegradable polymer synthesis with a focus on the use of discrete complexes and organocatalysts as active initiators for the stereocontrolled ring-opening polymerization of cyclic esters.

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