Gradient Copolymer Prepared from Alternating Ring-Opening Metathesis of Three Monomers

2021 ◽  
Author(s):  
Francis Opoku Boadi ◽  
Nicole S Sampson
Keyword(s):  
Ring Opening ◽  
Ruthenium Catalyst ◽  
Bulky Substituent ◽  
Gradient Copolymer ◽  
Alternating Copolymer ◽  
Highly Strained

Bicyclo[4.2.0]oct-6-ene-7-carboxamide is a simple but highly strained olefin monomer which forms an alternating copolymer with cyclohexene in the presence of N-heterocyclic carbene-ruthenium catalyst. [4.2.0] moiety with bulky substituent on C7...

Preparation and activity of ruthenium catalyst based on β-cyclodextrin for ring-opening metathesis polymerization

2021 ◽  
Vol 63 ◽  
pp. 152712
Author(s):  
Daichi Yoshida ◽  
Garry Sinawang ◽  
Motofumi Osaki ◽  
Hiroyasu Yamaguchi ◽  
Akira Harada ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ruthenium Catalyst ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization

scholarly journals Alkyl substituted [2.2]paracyclophane-1,9-dienes

2016 ◽  
Vol 14 (25) ◽  
pp. 6079-6087 ◽  
Author(s):  
Benjamin J. Lidster ◽  
Dharam R. Kumar ◽  
Andrew M. Spring ◽  
Chin-Yang Yu ◽  
Madeleine Helliwell ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization ◽  
Highly Strained

Highly strained alkyl-substituted [2.2]paracyclophane-1,9-dienes, suitable for ring opening metathesis polymerization to poly(phenylene vinylenes), have been prepared in excellent yields.

scholarly journals Dewar Heterocycles as Versatile Monomers for Ring-Opening Metathesis Polymerization

2020 ◽  
Author(s):  
Sepand Nistanaki ◽  
Hosea Nelson
Keyword(s):  
Ring Opening ◽  
Water Soluble ◽  
Ring Opening Metathesis Polymerization ◽  
Valence Isomerization ◽  
Metathesis Polymerization ◽  
Grubbs Catalysts ◽  
Amino Acid Polymers ◽  
Highly Strained ◽  
Acetylene Derivatives ◽  
Soluble Poly

We report the utility of readily available heterocycles as precursors to unique ring-opening metathesis polymerization (ROMP) monomers. Photochemical valence isomerization reactions of pyridones, dihydropyridines, and pyrones dearomatize the parent heterocycles to their highly strained Dewar isomers, which readily engage in controlled ROMP reactions using Grubbs catalysts. This strategy is used to access novel polymer backbones that contain strained β-lactam and azetidine cores, which can be further derivatized using post-polymerization chemistries. We demonstrate this through the synthesis of water-soluble β-amino acid polymers and soluble poly(acetylene) derivatives.

scholarly journals Cobalt-Catalyzed Multisubstituted Allylation of Chelation-Assisted C-H bond of (Hetero)arenes with Cyclopropenes

2021 ◽  
Author(s):  
Kuppan Ramachandran ◽  
Pazhamalai Anbarasan
Keyword(s):  
Organic Synthesis ◽  
Ring Opening ◽  
Highly Strained

Cyclopropenes are highly strained three-membered carbocycle, which offers unique reactivity in organic synthesis. Herein, Cp*CoIII-catalyzed ring-opening isomerization of cyclopropenes to cobalt vinylcarbene has been utilized for the synthesis of multisubstituted...

Synthesis and Applications of Cyclopropanones and their Equivalents as Three-Carbon Building Blocks in Organic Synthesis

Synthesis ◽  
2021 ◽  
Author(s):  
Yujin Jang ◽  
Roger Machin-Rivera ◽  
Vincent Lindsay
Keyword(s):  
Organic Synthesis ◽  
Ring Opening ◽  
Building Blocks ◽  
Ring Expansion ◽  
Ring System ◽  
Small Ring ◽  
Future Directions ◽  
Highly Strained ◽  
And Storage

Cyclopropanone derivatives constitute highly strained cycloalkanones with promising applications as three-carbon building blocks in organic synthesis. Due to the presence of a ketone in such a small ring system, all C–C bonds and the carbonyl group are considered to be labile in suitable conditions, leading to a wide variety of synthetic disconnections, including nucleophilic addition, ring expansion, ring-opening and (formal) cycloaddition. Despite their synthetic potential, the widespread adoption of cyclopropanones as substrates has been considerably hampered by the difficulties associated with the preparation and storage of such unstable compounds, prompting the development of cyclopropanone surrogates that can equilibrate to parent ketone in situ via elimination. This review summarizes the syntheses and applications of cyclopropanone derivatives and their equivalents, and offers a perspective of the state of the field as well as its expected future directions.

scholarly journals Living Ring-Opening Metathesis Polymerization of Exo-Norbornenes Bearing Both Cyano and Ester Functionalities by a Well-Defined Ruthenium Catalyst

2007 ◽  
Vol 39 (4) ◽  
pp. 318-329 ◽  
Author(s):  
Yasushi Nishihara ◽  
Yoshiaki Inoue ◽  
Akira T Saito ◽  
Yuushou Nakayama ◽  
Takeshi Shiono ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ruthenium Catalyst ◽  
Ring Opening Metathesis Polymerization ◽  
Metathesis Polymerization

Highly Strained Metallocenophanes: Synthesis and Ring-Opening of Sulfur-, Selenium- and Boron- Bridged [1]Ferrocenophanes

1997 ◽  
Vol 124 (1) ◽  
pp. 561-565 ◽  
Author(s):  
Derek P. Gates ◽  
Ron Rulkens ◽  
Regina Dirk ◽  
Paul Nguyen ◽  
John K. Pudelski ◽  
...  
Keyword(s):  
Ring Opening ◽  
Highly Strained
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