Electrografting of Alkyl Films at Low Driving Force by Diverting the Reactivity of Aryl Radicals Derived from Diazonium Salts

Langmuir ◽  
2014 ◽  
Vol 30 (46) ◽  
pp. 13907-13913 ◽  
Author(s):  
Dardan Hetemi ◽  
Frédéric Kanoufi ◽  
Catherine Combellas ◽  
Jean Pinson ◽  
Fetah I. Podvorica
Keyword(s):  
Driving Force ◽  
Diazonium Salts ◽  
Aryl Radicals

σ-Bond initiated generation of aryl radicals from aryl diazonium salts

2020 ◽  
Vol 18 (9) ◽  
pp. 1812-1819 ◽  
Author(s):  
Elene Tatunashvili ◽  
Bun Chan ◽  
Philippe E. Nashar ◽  
Christopher S. P. McErlean
Keyword(s):  
Room Temperature ◽  
Radical Reactions ◽  
Diazonium Salts ◽  
Aryl Radicals

Hantzsch esters and oxygen convert diazonium salts into aryl radicals, enabling rapid radical reactions to be performed in open flasks at room temperature.

Graftfast©: Towards the Control of Surface Properties of any Type of Materials by the Grafting of Polymers

2012 ◽  
Vol 445 ◽  
pp. 797-802 ◽  
Author(s):  
Alice Mesnage ◽  
Pardis Simon ◽  
Guy Deniau ◽  
Nathalie Herlin-Boime ◽  
Serge Palacin
Keyword(s):  
Surface Properties ◽  
Polymer Films ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
Diazonium Salts ◽  
Green Process ◽  
Graft Polymer ◽  
Grafted Polymer ◽  
Aryl Radicals ◽  
One Step

This document aims at presenting and explaining the mechanism of a simple green process, called Graftfast©, recently developed in order to graft polymer films onto any type of materials. This process is of great interest as it works in a short one step reaction at room temperature, atmospheric pressure in water. Particularly since this method is a redoxinduced process consisting in the reduction of diazonium salts into aryl radicals in presence of vinylic monomer, the involvement of such radicals was investigated. Moreover, this work demonstrates the efficiency of such process for the preparation of functionalized TiO2 nanoparticles. The composition and the grafted polymer quantities were investigated showing the successful grafting of the polymer onto the nanoparticles while conserving their morphology.

ChemInform Abstract: Allylation and Vinylation of Aryl Radicals Generated from Diazonium Salts.

ChemInform ◽  
2008 ◽  
Vol 39 (17) ◽  
Author(s):  
Markus R. Heinrich ◽  
Olga Blank ◽  
Daniela Ullrich ◽  
Marcel Kirschstein
Keyword(s):  
Diazonium Salts ◽  
Aryl Radicals

Covalent Modification of Carbon Surfaces by Aryl Radicals Generated from the Electrochemical Reduction of Diazonium Salts

1997 ◽  
Vol 119 (1) ◽  
pp. 201-207 ◽  
Author(s):  
Philippe Allongue ◽  
Michel Delamar ◽  
Bernard Desbat ◽  
Olivier Fagebaume ◽  
Rachid Hitmi ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Covalent Modification ◽  
Diazonium Salts ◽  
Aryl Radicals ◽  
Carbon Surfaces

Reactions of copper(II) β-diketonates under free radical conditions. II. Diazonium salts as aryl radicals source in the arylation of β-diketones

Tetrahedron ◽  
1992 ◽  
Vol 48 (33) ◽  
pp. 6909-6916 ◽  
Author(s):  
Maria E. Lorris ◽  
Rudolph A. Abramovitch ◽  
Jorge Marquet ◽  
Marcial Moreno-Mañas
Keyword(s):  
Free Radical ◽  
Diazonium Salts ◽  
Aryl Radicals

Allylation and Vinylation of Aryl Radicals Generated from Diazonium Salts

2007 ◽  
Vol 72 (25) ◽  
pp. 9609-9616 ◽  
Author(s):  
Markus R. Heinrich ◽  
Olga Blank ◽  
Daniela Ullrich ◽  
Marcel Kirschstein
Keyword(s):  
Diazonium Salts ◽  
Aryl Radicals

scholarly journals Covalent attachment of phenyl and carboxyphenyl layers derived from diazonium salts onto activated charcoal for the adsorption of pesticides

2018 ◽  
Vol 37 (1) ◽  
pp. 71 ◽  
Author(s):  
Jeton Halili ◽  
Fexhrie Salihu ◽  
Avni Riza Berisha
Keyword(s):  
Gas Chromatography ◽  
Organochlorine Pesticides ◽  
Activated Charcoal ◽  
Covalent Modification ◽  
Covalent Attachment ◽  
Steric Effects ◽  
Diazonium Salts ◽  
Aryl Radicals ◽  
The Past ◽  
Tentative Explanation

The past and recent uncontrolled use of organochlorine pesticides imposes serious problems due to their adverse undesired effects in ecosystems. Finding new ways to dispose of these molecules is therefore mandatory. The covalent modification of activated charcoal powder (ACP) by substituted aryl groups can be achieved by reaction with aryl radicals obtained through the sonically induced dediazonation of diazonium salts. Seventeen organochlorine pesticides were adsorbed on ACP covalently grafted with phenyl and carboxyphenyl layers. The sorption percentages of the pesticides onto the carboxyphenyl modified ACPs [measured by GC-ECD (Gas Chromatography – Electron Capture Detector)] were in the range of 90–100% (DDT, δ-HCH, γ-HCH and endrin aldehyde), 80–90% (methoxychlor, endosulfan II, p,p-DDD and β-HCH) and 60–80% (α-HCH, DDE, endosulfansulfate, endrin, endosulfan I, aldrin, heptachlorepoxid, dieldrin and heptachlor). A tentative explanation is given for these differences based on steric effects.

Real Metal-Free C-H Arylation of (Hetero)arenes: The Radical Way

Synthesis ◽  
2021 ◽  
Author(s):  
Fabio Bellina
Keyword(s):  
Ascorbic Acid ◽  
Aryl Halides ◽  
Diazonium Salts ◽  
Atom Economy ◽  
Chlorpromazine Hydrochloride ◽  
Metal Free ◽  
Aryl Radicals ◽  
Diaryliodonium Salts ◽  
Carbon Carbon Bonds ◽  
Synthetic Methodologies

Synthetic methodologies involving the formation of carbon-carbon bonds from carbon-hydrogen bonds are of significant synthetic interest, both for efficiency in terms of atom economy and for their undeniable usefulness in late-stage functionalization approaches. Combining these aspects with being metal-free, the radical C-H intermolecular arylation procedures covered by this review represent a powerful green means for the synthesis of (hetero)biaryl systems. 1. Introduction 2. Arylation with arenediazonium salts and related derivatives 2.1. Ascorbic acid as reductant 2.2. Hydrazines as reductants 2.3. Gallic acid as reductant 2.4. Polyanilines as reductants 2.5. Chlorpromazine hydrochloride as reductant 2.6 Phenalenyl-based radicals as reductants 2.7 Electrolytic reduction of diazonium salts 2.8 Visible-light mediated arylation 3. Arylation with arylhydrazines: generation of aryl radicals using an oxidant 4. Arylation with diaryliodonium salts 5. Arylation with aryl halides 6. Conclusions

In situ TEM Studies of agglomeration of sub-nanometer Ru layers in Ru/C multilayers

1992 ◽  
Vol 50 (1) ◽  
pp. 256-257
Author(s):  
Tai D. Nguyen ◽  
Ronald Gronsky ◽  
Jeffrey B. Kortright
Keyword(s):  
Layered Structure ◽  
Driving Force ◽  
High Energy ◽  
Superior Performance ◽  
In Situ Tem ◽  
Rayleigh Instability ◽  
Practical Applications ◽  
Transmission Electron ◽  
Diffraction Patterns

Nanometer period Ru/C multilayers are one of the prime candidates for normal incident reflecting mirrors at wavelengths < 10 nm. Superior performance, which requires uniform layers and smooth interfaces, and high stability of the layered structure under thermal loadings are some of the demands in practical applications. Previous studies however show that the Ru layers in the 2 nm period Ru/C multilayer agglomerate upon moderate annealing, and the layered structure is no longer retained. This agglomeration and crystallization of the Ru layers upon annealing to form almost spherical crystallites is a result of the reduction of surface or interfacial energy from die amorphous high energy non-equilibrium state of the as-prepared sample dirough diffusive arrangements of the atoms. Proposed models for mechanism of thin film agglomeration include one analogous to Rayleigh instability, and grain boundary grooving in polycrystalline films. These models however are not necessarily appropriate to explain for the agglomeration in the sub-nanometer amorphous Ru layers in Ru/C multilayers. The Ru-C phase diagram shows a wide miscible gap, which indicates the preference of phase separation between these two materials and provides an additional driving force for agglomeration. In this paper, we study the evolution of the microstructures and layered structure via in-situ Transmission Electron Microscopy (TEM), and attempt to determine the order of occurence of agglomeration and crystallization in the Ru layers by observing the diffraction patterns.

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