New acid/base salts as co-catalysts for the organocatalyzed ring opening polymerization of lactide

2014 ◽  
Vol 53 (5) ◽  
pp. 659-664 ◽  
Author(s):  
Yong Miao ◽  
Nicholas Stanley ◽  
Audrey Favrelle ◽  
Till Bousquet ◽  
Marc Bria ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Acid Base ◽  
Co Catalysts

Catalytic insights into acid/base conjugates: highly selective bifunctional catalysts for the ring-opening polymerization of lactide

2011 ◽  
Vol 47 (11) ◽  
pp. 3105 ◽  
Author(s):  
Daniel J. Coady ◽  
Kazuki Fukushima ◽  
Hans W. Horn ◽  
Julia E. Rice ◽  
James L. Hedrick
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Bifunctional Catalysts ◽  
Acid Base

scholarly journals Amphiphilic diblock copolymer of hydrophilic-functionalized lactone and lactide via switchable organocatalytic polymerization

RSC Advances ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 1905-1908
Author(s):  
Jinmei Bai ◽  
Xiaoying Tang ◽  
Yuan Zhang ◽  
Jingjing Lin ◽  
Minfeng Li
Keyword(s):  
Particle Size ◽  
Diblock Copolymer ◽  
Ring Opening ◽  
Diblock Copolymers ◽  
Main Chain ◽  
Ring Opening Polymerization ◽  
Acid Base ◽  
One Pot ◽  
Amphiphilic Diblock Copolymers ◽  
Organocatalytic Polymerization

Main-chain degradable amphiphilic diblock copolymers prepared by one-pot ring-opening polymerization via actively manipulating catalytic states of an acid–base catalytic system were capable of forming stable micelle with optimal particle size.

Lewis acid/base modulation in β-diiminate zinc-catalyzed switchable ring-opening polymerization of rac-lactide

2019 ◽  
Vol 62 (4) ◽  
pp. 475-478 ◽  
Author(s):  
Pan Zhang ◽  
Minhui Zhao ◽  
Wenmin Pang ◽  
Changle Chen
Keyword(s):  
Lewis Acid ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Acid Base

A Recommender System for Inverse Design of Polycarbonates and Polyesters

2020 ◽  
Author(s):  
Nathaniel Park ◽  
Dmitry Yu. Zubarev ◽  
James L. Hedrick ◽  
Vivien Kiyek ◽  
Christiaan Corbet ◽  
...  
Keyword(s):  
Ring Opening ◽  
High Performance ◽  
Recommendation System ◽  
Polymeric Materials ◽  
Monomer Conversion ◽  
Design Strategy ◽  
Ring Opening Polymerization ◽  
Inverse Design ◽  
False Negatives ◽  
Accelerate Development

The convergence of artificial intelligence and machine learning with material science holds significant promise to rapidly accelerate development timelines of new high-performance polymeric materials. Within this context, we report an inverse design strategy for polycarbonate and polyester discovery based on a recommendation system that proposes polymerization experiments that are likely to produce materials with targeted properties. Following recommendations of the system driven by the historical ring-opening polymerization results, we carried out experiments targeting specific ranges of monomer conversion and dispersity of the polymers obtained from cyclic lactones and carbonates. The results of the experiments were in close agreement with the recommendation targets with few false negatives or positives obtained for each class.<br>

Bimetallic Radical Redox-Relay Catalysis for the Isomerization of Epoxides to Allylic Alcohols

2019 ◽  
Author(s):  
Ke-Yin Ye ◽  
Terry McCallum ◽  
Song Lin
Keyword(s):  
Ring Opening ◽  
High Reactivity ◽  
Hydrogen Atom Transfer ◽  
Organic Radicals ◽  
Epoxide Ring ◽  
Allylic Alcohols ◽  
Epoxide Ring Opening ◽  
Bond Forming ◽  
Co Catalysts ◽  
The Rich

Organic radicals are generally short-lived intermediates with exceptionally high reactivity. Strategically, achieving synthetically useful transformations mediated by organic radicals requires both efficient initiation and selective termination events. Here, we report a new catalytic strategy, namely bimetallic radical redox-relay, in the regio- and stereoselective rearrangement of epoxides to allylic alcohols. This approach exploits the rich redox chemistry of Ti and Co complexes and merges reductive epoxide ring opening (initiation) with hydrogen atom transfer (termination). Critically, upon effecting key bond-forming and -breaking events, Ti and Co catalysts undergo proton-transfer/electron-transfer with one another to achieve turnover, thus constituting a truly synergistic dual catalytic system.<br>

Bisurea and Bisthiourea H-Bonding Organocatalysts for Ring-Opening Polymerization: Cues for the Catalyst Design

2019 ◽  
Vol 52 (23) ◽  
pp. 9232-9237 ◽  
Author(s):  
Rukshika S. Hewawasam ◽  
U. L. D. Inush Kalana ◽  
Nayanthara U. Dharmaratne ◽  
Thomas J. Wright ◽  
Timothy J. Bannin ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Catalyst Design
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