Results 11 to 20 of about 1,369,819 (304)

Aromatic ring-opening metathesis [PDF]

Nature
Abstract Aromatic compounds are used across chemistry and materials science as a result of their stability, characteristic interactions, defined molecular shape and the numerous approaches for their synthesis by a diversity of cyclization reactions 1 .
Valeriia Hutskalova, Christof Sparr
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Ring-Opening Fluorination of Bicyclic Azaarenes [PDF]

Chemical Science, 2021
We have discovered a ring-opening fluorination of bicyclic azaarenes. Upon treatment of bicyclic azaarenes such as pyrazolopyridines with electrophilic fluorinating agents, fluorination of the aromatic ring is followed by a ring-opening reaction. Although this overall trans-formation can be classified as an electrophilic fluorination of an aromatic ...
Masaaki Komatsuda, Ayane Suto, Hiroki Kondo, Hiroyuki Takada, Kenta Kato, Bunnai Saito, Junichiro Yamaguchi   +6 more
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Ring-Opening Polymerization of Hemoglobin [PDF]

Biomacromolecules, 2019
Hemoglobin (Hb), an oxygen-carrying protein, has an α2β2 tetrameric structure that dissociates reversibly into two αβ dimers (α2β2 ⇄ 2αβ). We synthesized a cyclic Hb-ring monomer with two β subunits bound through a 10 kDa polyethylene glycol (PEG) chain.
Takashi Matsuhira, Keizo Yamamoto, Hiromi Sakai   +2 more
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Mechanically Enhanced Proline Ring-Opening in Proteins [PDF]

, 2022
Proteins such as collagen and elastin are subjected to highly repetitive stresses in the cardiovascular system. These proteins can have half-lives of many decades and, therefore, experience many tens or hundreds of millions of stress-strain cycles.
Jan, Hoh
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Radical Ring-Opening of Oxetanes Enabled by Co-Catalysis [PDF]

, 2021
Oxetanes are valuable building blocks due to their well-explored propensity to undergo ring-opening reactions with diverse nucleophiles. However, their application as precursors of radical species remains unexplored. Herein, we present a cobalt catalysis-
Wojciech , Chaładaj, Michał, Ociepa, Dorota, Gryko, Aleksandra, Potrząsaj   +3 more
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Synthesis and Membrane Properties of Troger′s Base Polymers

Nantong Daxue xuebao. Ziran kexue ban, 2020
Troger′s base polymers have strong chemical stability, thermal stability and rigidity, V-shaped ladder structure and porous structure. The nitrogen heterocyclic ring is hydrophilic.
HUANG Ronglu; ZHANG Chen; WANG Yuyong; TANG Hai; ZHANG Ze
doaj   +1 more source

Si-Imidazole-HSO4 Functionalized Magnetic Fe3O4 Nanoparticles as an Efficient and Reusable Catalyst for the Regioselective Ring Opening of Epoxides in Water [PDF]

Nanochemistry Research, 2016
An efficient and simple method for the preparation of Si-Imidazole-HSO4 functionalized magnetic Fe3O4 nanoparticles (Si-Im-HSO4 MNPs) and used as an efficient and reusable magnetic catalysts for the regioselective ring opening of epoxides under green ...
Eshagh Rezaee Nezhad, Ezatallah Pourmalekshahi   +1 more
doaj   +1 more source

Flavin-enabled reductive and oxidative epoxide ring opening reactions

Nature Communications, 2022
Epoxide ring opening reactions are important in both biological processes and synthetic applications. Here, the authors show that flavin cofactors can catalyze reductive and oxidative epoxide ring opening reactions and propose the underlying mechanisms.
Bidhan Chandra De, Wenjun Zhang, Chunfang Yang, Attila Mándi, Chunshuai Huang, Liping Zhang, Wei Liu, Mark W. Ruszczycky, Yiguang Zhu, Ming Ma, Ghader Bashiri, Tibor Kurtán, Hung-wen Liu, Changsheng Zhang   +13 more
doaj   +1 more source

An electrochemical approach to aluminum-based redox switchable ring opening polymerization [PDF]

, 2023
We report the electrochemically switchable reactivity of (salfen)Al(OiPr) (salfen = 1,1′-di(2,4-bis-tert-butyl-salicylimino)ferrocene) toward the ring opening polymerization of various cyclic esters, ethers, and carbonates.
Amy, Lai, Zachary, Hern, Ramzi, Massad, Paula, Diaconescu   +3 more
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Carbodiimide Ring-opening Metathesis Polymerization

ACS Central Science, 2022
Controlled incorporation of nitrogen into macromolecular skeletons is a long-standing challenge whose resolution would enable the preparation of soft materials with the scalability of man-made plastics and functionality of Nature’s proteins. Nylons and polyurethanes notwithstanding, nitrogen-rich polymer backbones remain scarce, and their synthesis ...
Kaplan, Samuel W., Johnson, J. Drake, Wang, Zian, Sheiko, Sergei S., Maw, Mitchell, Zhukhovitskiy, Aleksandr V., Toth, Jozsef   +6 more
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