scholarly journals Recent progress on the synthesis of cyclic polymers via ring-expansion strategies

2017 ◽  
Vol 55 (18) ◽  
pp. 2892-2902 ◽  
Author(s):  
Young A. Chang ◽  
Robert M. Waymouth
Keyword(s):  
Recent Progress ◽  
Ring Expansion ◽  
Cyclic Polymers ◽  
Expansion Strategies

Advances in Aza-Claisen-Rearrangement-Induced Ring-Expansion Strategies

2017 ◽  
Vol 6 (9) ◽  
pp. 1117-1129 ◽  
Author(s):  
Jong-Wha Jung ◽  
Seok-Ho Kim ◽  
Young-Ger Suh
Keyword(s):  
Claisen Rearrangement ◽  
Ring Expansion ◽  
Expansion Strategies

Synthesis of Cyclic Polymers:  Ring-Expansion Reaction of CyclicS-Dithioester with Thiiranes

2005 ◽  
Vol 38 (14) ◽  
pp. 5964-5969 ◽  
Author(s):  
Hiroto Kudo ◽  
Shinya Makino ◽  
Atsushi Kameyama ◽  
Tadatomi Nishikubo
Keyword(s):  
Ring Expansion ◽  
Cyclic Polymers ◽  
Ring Expansion Reaction

scholarly journals A happy medium: the synthesis of medicinally important medium-sized rings via ring expansion

2020 ◽  
Vol 11 (11) ◽  
pp. 2876-2881 ◽  
Author(s):  
Aimee K. Clarke ◽  
William P. Unsworth
Keyword(s):  
Medicinal Chemistry ◽  
Ring Expansion ◽  
Expansion Strategies

Ring expansion strategies are ideally suited to make synthetically challenging, medium-sized rings with much potential in medicinal chemistry.

scholarly journals A scalable and continuous access to pure cyclic polymers enabled by quarantined heterogeneous catalysts

2021 ◽  
Author(s):  
Ki-Young Yoon ◽  
Jinkyung Noh ◽  
Quan Gan ◽  
Julian Edwards ◽  
Robert Tuba ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Continuous Process ◽  
Ring Expansion ◽  
Ruthenium Catalysts ◽  
Cyclic Polymers ◽  
Cyclic Polymer ◽  
Polymer Separation ◽  
Scalable Synthesis ◽  
Kinetics Of

Cyclic polymers are topologically interesting and envisioned as a lubricant material. However, scalable synthesis of pure cyclic polymers remains elusive. The most straightforward way is to recycle a used catalyst for the synthesis of cyclic polymers. Unfortunately, it is demanding because of the catalyst’s vulnerability and inseparability from polymers, which depreciates the practicality of the process. Here, we develop a continuous process streamlined in a circular way that polymerization, polymer separation, and catalyst recovery happen in situ, to dispense a pure cyclic polymer after bulk ring-expansion metathesis polymerization of cyclopentene. It is enabled by introducing silica-supported ruthenium catalysts and a newly-designed glassware. Also, different depolymerization kinetics of the cyclic polymer from its linear analogue is discussed. This process minimizes manual labor, maximizes security of vulnerable catalysts, and guarantees purity of cyclic polymers, thereby showcasing a prototype of a scalable access to cyclic polymers with increased reusability of precious catalysts (≥415,000 turnovers).

Introducing “Ynene” Metathesis: Ring-Expansion Metathesis Polymerization Leads to Highly Cis and Syndiotactic Cyclic Polymers of Norbornene

2016 ◽  
Vol 138 (20) ◽  
pp. 6408-6411 ◽  
Author(s):  
Soufiane S. Nadif ◽  
Tomohiro Kubo ◽  
Stella A. Gonsales ◽  
Sudarsan VenkatRamani ◽  
Ion Ghiviriga ◽  
...  
Keyword(s):  
Ring Expansion ◽  
Cyclic Polymers ◽  
Metathesis Polymerization
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