Structure and Activity Relationship Studies of N-Heterocyclic Olefins and Thioureas/Ureas Catalytic System: Application in Ring-opening Polymerization of Lactones

2021 ◽  
Author(s):  
Li Zhou ◽  
Zhenyu Wang ◽  
Guangqiang Xu ◽  
Chengdong Lv ◽  
Qinggang Wang
Keyword(s):  
Catalytic System ◽  
System Application ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Activity Relationship ◽  
Highly Efficient ◽  
Structure And Activity

A highly efficient and controllable ring-opening polymerization of lactones (δ-valerolactone, ε-caprolactone and rac-lactide) has been achieved by using N-heterocyclic olefins (NHOs) and thioureas/ureas (TUs/Us) catalytic system. This catalytic system showed...

Sodium complexes bearing cavity-like conformations: a highly active and well-controlled catalytic system for macrolactone homo- and copolymerization

2021 ◽  
Vol 12 (13) ◽  
pp. 1957-1966
Author(s):  
Xinya Wang ◽  
Xiaohua Wang ◽  
Nuo Zhen ◽  
Jin Gu ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Catalytic System ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Highly Active ◽  
Sodium Complexes

Sodium complexes displaying cavity-like conformations and, therefore, suppressed transesterification during the ring-opening polymerization of pentadecalactone are disclosed herein.

Rare-Earth Complexes with Multidentate Tethered Phenoxy-Amidinate Ligands: Synthesis, Structure, and Activity in Ring-Opening Polymerization of Lactide

2011 ◽  
Vol 30 (20) ◽  
pp. 5509-5523 ◽  
Author(s):  
Mikhail Sinenkov ◽  
Evgeny Kirillov ◽  
Thierry Roisnel ◽  
Georgy Fukin ◽  
Alexander Trifonov ◽  
...  
Keyword(s):  
Rare Earth ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Rare Earth Complexes ◽  
Structure And Activity

Molecular Structure–Catalytic Activity Relationship in the Ring-Opening Polymerization of (Macro)lactones

2016 ◽  
Vol 49 (3) ◽  
pp. 796-806 ◽  
Author(s):  
Mark P. F. Pepels ◽  
Inge Hermsen ◽  
Geert J. Noordzij ◽  
Rob Duchateau
Keyword(s):  
Molecular Structure ◽  
Catalytic Activity ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Activity Relationship

Functionalized Polyesters via Stereoselective Electrochemical Ring-Opening Polymerization of O-Carboxyanhydrides

2020 ◽  
Author(s):  
Yongliang Zhong ◽  
quanyou feng ◽  
xiaoqian wang ◽  
jia chen ◽  
wenjun cai ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Catalytic System ◽  
Ring Opening ◽  
Electrical Current ◽  
Ring Opening Polymerization ◽  
Glass Transition Temperatures ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions

Ring-opening polymerization is used to prepare polyesters with precisely controlled molecular weights, molecular weight distributions, and tacticities. Herein, we report a newly developed Co/Zn catalytic system that can be activated by an electrical current to mediate efficient ring-opening polymerization of enantiopure <i>O</i>-carboxyanhydrides, allowing for the synthesis of isotactic functionalized polyesters with high molecular weights (>140 kDa) and narrow molecular weight distributions (<i>M</i><sub>w</sub>/<i>M</i><sub>n</sub> < 1.1). We also demonstrate that these catalysts can be used for stereoselective ring-opening polymerization of racemic <i>O</i>-carboxyanhydrides to synthesize syndiotactic or stereoblock copolymers with different glass transition temperatures compared with their atactic counterparts.

Green and sustainable synthesis of poly(δ-valerolactone) with TBD catalyzed ring-opening polymerization reaction

2021 ◽  
Author(s):  
Kai Cheng ◽  
Shiyao Lu ◽  
Kai Wang ◽  
Guangsheng Luo
Keyword(s):  
Efficient Method ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Polymerization Reaction ◽  
Aliphatic Polyester ◽  
Synthetic Route ◽  
Highly Efficient

Ring-opening polymerization (ROP) of lactones catalyzed by 1,5,7-triazabicyclo[4,4,0]decane-5-ene (TBD) is a highly efficient method for synthesizing aliphatic polyester materials. In order to create a green and sustainable synthetic route of...

scholarly journals Functionalized Polyesters via Stereoselective Electrochemical Ring-Opening Polymerization of O-Carboxyanhydrides

2020 ◽  
Author(s):  
Yongliang Zhong ◽  
quanyou feng ◽  
xiaoqian wang ◽  
jia chen ◽  
wenjun cai ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Catalytic System ◽  
Ring Opening ◽  
Electrical Current ◽  
Ring Opening Polymerization ◽  
Glass Transition Temperatures ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
Weight Distributions

Ring-opening polymerization is used to prepare polyesters with precisely controlled molecular weights, molecular weight distributions, and tacticities. Herein, we report a newly developed Co/Zn catalytic system that can be activated by an electrical current to mediate efficient ring-opening polymerization of enantiopure <i>O</i>-carboxyanhydrides, allowing for the synthesis of isotactic functionalized polyesters with high molecular weights (>140 kDa) and narrow molecular weight distributions (<i>M</i><sub>w</sub>/<i>M</i><sub>n</sub> < 1.1). We also demonstrate that these catalysts can be used for stereoselective ring-opening polymerization of racemic <i>O</i>-carboxyanhydrides to synthesize syndiotactic or stereoblock copolymers with different glass transition temperatures compared with their atactic counterparts.

scholarly journals Chemoselective Ring-Opening Polymerization of Bio-Renewable α-Methylene-γ-Butyrolactone via an Organophosphazene/urea Binary Synergistic Catalytic System Toward a Sustainable Polyester

2020 ◽  
Author(s):  
Yong Shen ◽  
Wei Xiong ◽  
YongZheng Li ◽  
ZhiChao Zhao ◽  
Hua Lu ◽  
...  
Keyword(s):  
Double Bond ◽  
Catalytic System ◽  
Low Temperatures ◽  
Ring Opening ◽  
Theoretical Calculations ◽  
Unsaturated Polyester ◽  
Ring Opening Polymerization ◽  
Membered Ring ◽  
Exocyclic Double Bond ◽  
Binary Catalyst

Despite the great potential of bio-renewable a-methylene-<a></a><a></a><a>g-butyrolactone</a> (MBL) to produce functional recyclable polyester, the ring-opening polymerization (ROP) of MBL remains as a challenge due to the competing polymerization of the highly reactive exocyclic double bond and the low strained five membered ring. In this contribution, we present the first organocatalytic chemoselective ROP of MBL to exclusively produce recyclable unsaturated polyester by utilizing a phosphazene base/urea binary catalyst. We show that delicate chemoselectivity can be realized by controlling the temperature and using selected urea catalysts. Experimental and theoretical calculations provide mechanistic insights and indicate that the kinetically controlled ROP pathway is favored by using urea with stronger acidity at low temperatures.

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