An Easy and Efficient Route to Macrocyclic Polymers Via Intramolecular Radical−Radical Coupling of Chain Ends

2010 ◽  
Vol 43 (24) ◽  
pp. 10304-10310 ◽  
Author(s):  
Andrew F. Voter ◽  
Eric S. Tillman
Keyword(s):  
Radical Coupling ◽  
Efficient Route ◽  
Macrocyclic Polymers

Synthesis of Indoline-2,3-diones by Radical Coupling of Indolin-2-ones with tert-Butyl Hydroperoxide

Synlett ◽  
2017 ◽  
Vol 29 (02) ◽  
pp. 215-218 ◽  
Author(s):  
Wei-Wei Ying ◽  
Wen-Ming Zhu ◽  
Hongze Liang ◽  
Wen-Ting Wei
Keyword(s):  
Coupling Reaction ◽  
Metal Catalyst ◽  
Butyl Hydroperoxide ◽  
Alkyl Radicals ◽  
Tert Butyl ◽  
Radical Coupling ◽  
Tert Butyl Hydroperoxide ◽  
Radical Coupling Reaction ◽  
Efficient Route ◽  
Novel Strategy

A novel strategy has been developed for the synthesis of indoline-2,3-diones through a metal-free radical-coupling reaction. Alkyl radicals derived from indolin-2-ones through a radical-transfer reaction combine with the tert-butylhydroperoxy radical readily generated from commercially available tert-butyl hydroperoxide to afford 3-(tert-­butylperoxy)indolin-2-one intermediates that can be further transformed into indoline-2,3-diones under air. This strategy provides a ­simple and efficient route to the construction of a C=O bond without the use of any metal catalyst or base.

scholarly journals An Efficient Route to Isochromene Derivatives via Cascade Radical Cyclization and Radical‐Radical Coupling

2019 ◽  
Vol 361 (18) ◽  
pp. 4354-4359 ◽  
Author(s):  
Kaili Yu ◽  
Minyan Li ◽  
Guogang Deng ◽  
Chunxiang Liu ◽  
Jing Wang ◽  
...  
Keyword(s):  
Radical Cyclization ◽  
Radical Coupling ◽  
Efficient Route

Selective oxidative synthesis of meso-beta fused porphyrin dimers

2013 ◽  
Vol 17 (04) ◽  
pp. 247-251 ◽  
Author(s):  
Bradley J. Brennan ◽  
Jaro Arero ◽  
Paul A. Liddell ◽  
Thomas A. Moore ◽  
Ana L. Moore ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
High Yield ◽  
Free Base ◽  
Bond Forming ◽  
Radical Coupling ◽  
Electrochemical Window ◽  
Nir Absorption ◽  
Efficient Route ◽  
Uv Visible ◽  
Porphyrin Dimers

An efficient route to meso-β doubly connected fused porphyrin dimers was developed. Synthesis of the dimers incorporated two successive C–C bond-forming steps selectively coupling unsubstituted meso- and β-positions. Using Cu(BF4)2 as an oxidant in nitromethane solvent, the radical coupling of Cu(II) -porphyrins occurred in high yield and without side-products, allowing chromatography-free purification. Efficient demetalation of the product yielded free-base derivatives and the possibility to incorporate other metals into the macrocycles. The absorption and electrochemical properties vary with the inserted metal, showing broad UV-visible-NIR absorption and multiple one-electron oxidations/reductions in a relatively narrow electrochemical window.

scholarly journals Front Cover Picture: An Efficient Route to Isochromene Derivatives via Cascade Radical Cyclization and Radical‐Radical Coupling (Adv. Synth. Catal. 18/2019)

2019 ◽  
Vol 361 (18) ◽  
pp. 4147-4147
Author(s):  
Kaili Yu ◽  
Minyan Li ◽  
Guogang Deng ◽  
Chunxiang Liu ◽  
Jing Wang ◽  
...  
Keyword(s):  
Radical Cyclization ◽  
Front Cover ◽  
Radical Coupling ◽  
Efficient Route

Synthesis of Macrocyclic Polymers Formed via Intramolecular Radical Trap-Assisted Atom Transfer Radical Coupling

2012 ◽  
Vol 1 (8) ◽  
pp. 1066-1070 ◽  
Author(s):  
Andrew F. Voter ◽  
Eric S. Tillman ◽  
Peter M. Findeis ◽  
Scott C. Radzinski
Keyword(s):  
Atom Transfer ◽  
Radical Trap ◽  
Radical Coupling ◽  
Macrocyclic Polymers

Carbon Monoxide Related Reductions

INEOS OPEN ◽  
2020 ◽  
Vol 3 ◽  
Author(s):  
O. I. Afanasyev ◽  
◽  
D. Chusov ◽  
Keyword(s):  
Organic Chemistry ◽  
Carbon Monoxide ◽  
Reducing Agent ◽  
Current Development ◽  
Efficient Route ◽  
Development Prospects

Carbon monoxide is a unique reducing agent that is only gaining popularity in organic chemistry. This review highlights the main approaches to the application of CO as a reducing agent, summarizes and critically analyzes the key trends in this field, and describes the current development prospects. Potentially the most selective and efficient route for the realization of these processes is demonstrated.

Palladium Nanowire Thin Films via Template Growth

2003 ◽  
Vol 775 ◽  
Author(s):  
Donghai Wang ◽  
David T. Johnson ◽  
Byron F. McCaughey ◽  
J. Eric Hampsey ◽  
Jibao He ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Conductive Substrate ◽  
Palladium Nanowires ◽  
Efficient Route ◽  
Silica Thin Film

AbstractPalladium nanowires have been electrodeposited into mesoporous silica thin film templates. Palladium continually grows and fills silica mesopores starting from a bottom conductive substrate, providing a ready and efficient route to fabricate a macroscopic palladium nanowire thin films for potentially use in fuel cells, electrodes, sensors, and other applications. X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicate it is possible to create different nanowire morphology such as bundles and swirling mesostructure based on the template pore structure.

Quantum Mechanical Calculations Suggest That Lignin Polymerization Is Kinetically Controlled

2019 ◽  
Author(s):  
Terry Gani ◽  
Michael Orella ◽  
Eric Anderson ◽  
Michael Stone ◽  
Fikile Brushett ◽  
...  
Keyword(s):  
Plant Cell ◽  
First Principles ◽  
Plant Cell Wall ◽  
Biological Processes ◽  
Plant Cell Walls ◽  
Biomass Valorization ◽  
Effective Strategies ◽  
Radical Coupling ◽  
Kinetically Controlled ◽  
Atomistic Models

Lignin is an abundant biopolymer important for plant function while holding promise as a renewable source of valuable chemicals. Although the lignification process in plant cell walls has been long-studied, a comprehensive, mechanistic understanding on the molecular scale remains elusive. A better understanding of lignification will lead to improved atomistic models of the plant cell wall that could, in turn, inform effective strategies for biomass valorization. Here, using first-principles quantum chemical calculations, we show that a simple model of kinetically-controlled radical coupling broadly rationalizes qualitative experimental observations of lignin structure across a wide variety of biomass types, thus paving the way for predictive, first-principles models of lignification while highlighting the ability of computational chemistry to help illuminate complex biological processes.

Efficient Route for Synthesis of Enamines from 1,3-Alkyl-2-Thioxodihydropyrimidine-4,6(1H,5H)-dione Enols

2019 ◽  
Vol 16 (7) ◽  
pp. 538-540
Author(s):  
Anamika Sharma ◽  
Zainab M. Almarhoon ◽  
Ayman El-Faham ◽  
Beatriz G. de la Torre ◽  
Fernando Albericio
Keyword(s):  
Ammonium Chloride ◽  
Thiobarbituric Acid ◽  
Acid Acid ◽  
Efficient Route ◽  
Harsh Conditions

Here we report a greener approach for the synthesis of enamines from enols of 1,3-alkyl-2- thioxodihydropyrimidine-4,6(1H,5H)-dione (thiobarbituric acid) acid using ammonium chloride and ethanol as solvents. This protocol removes the need for catalysts or harsh conditions.

Sign in / Sign up

Export Citation Format

Share Document