Search results for " Heck Reaction"

showing 4 items of 4 documents

Catechol-Functionalized Carbon Nanotubes as Support for Pd Nanoparticles

2022

Carbon nanotubes have been covalently functionalized with catechol moieties through the formation of the corresponding aryl radicals obtained by reacting 4-aminocatechol with isoamyl nitrite. The functionalized multiwalled carbon nanotubes have been in turn used to immobilize Pd(II) ions on its surface forming catechol-Pd complexes, which were reduced to Pd nanoparticles (NPs). The so-obtained hybrid material has been characterized by means of thermogravimetric analysis coupled with differential scanning calorimetry (TGA-DSC), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). This latter technique allowed to estimate the nanoparticle size (5.7 +/- 2.8 nm) wh…

Heterogeneous catalysisSuzuki and Heck reactionsOrganic ChemistryC-C coupling reactionsC−C coupling reactionsCarbon nanotubesPhysical and Theoretical ChemistryPalladium nanoparticlesEuropean Journal of Organic Chemistry
researchProduct

Supported C60-IL-PdNPs as extremely active nanocatalysts for C-C cross-coupling reactions

2016

A C60-ionic liquid hybrid has been covalently linked to three different solid supports, namely amorphous silica, SBA-15 and Fe2O3@SiO2, and the resulting materials have been employed as covalently supported ionic liquid phases (cSILP) in order to immobilize and stabilize palladium nanoparticles (PdNPs). These novel hybrid materials are based on a sort of "matryoshka" system (PdNPs@imidazolium-salt@C60@support) in which the imidazolium-based moieties have not been directly linked to the surface of the support, but they are present in an octopus-like spatial arrangement on the uniformly surface-distributed fullerenes. These materials have been fully characterized and successfully employed as …

Materials scienceFullerene010405 organic chemistryRenewable Energy Sustainability and the EnvironmentChemistry (all)General ChemistrySettore CHIM/06 - Chimica OrganicaMaterials Science (all) Heterogeneous Catalysis Nanoparticles Suzuki reaction Heck reactioncross coupling010402 general chemistry01 natural sciencesNanomaterial-based catalystCoupling reaction0104 chemical sciencesCatalysischemistry.chemical_compoundChemical engineeringchemistryCovalent bondIonic liquidOrganic chemistryGeneral Materials ScienceAmorphous silicaHybrid material
researchProduct

LIQUIDI IONICI E FULLERENI: PIATTAFORME PER NUOVI MATERIALI

The synthesis of innovative catalysts based on different carbon nanoforms (CNFs), namely fullerene C60 and carbon nanotubes (CNTs), and their application in Suzuki and Heck C-C coupling reactions, constitutes the common thread of the first part (Chapter 1 and 2) of this thesis. C60 and CNTs were functionalized with ionic liquids (ILs) and poly-amidoamine (PAMAM) dendrimers, respectively, and used as supports for palladium nanoparticles (PdNPs). Moreover, additional supported catalytic systems based on one of the synthesized C60-IL hybrids were prepared and successfully employed in the title coupling reactions. The final part (Chapter 3) of the thesis deals on the microwave-mediated synthesi…

Settore CHIM/06 - Chimica OrganicaFullerene C60 / C70 ionic liquids single walled carbon nanotubes polyamidoamine dendrimers Suzuki and Heck reactions palladium nanoparticles microwave-mediated synthesis bulk heterojunction polymer solar cells
researchProduct

DEEP EUTECTIC SOLVENTS E LIQUIDI IONICI: SOLVENTI PER LO SVILUPPO DI PROCESSI ECO-COMPATIBILI

2020

L’obiettivo di questi tre anni di Dottorato è stato lo studio e l’utilizzo nuovi solventi di reazione in grado di sostituire i solventi organici classici. In particolare sono stati studiati i Deep Eutectic Solvent (DES) e le miscele di Liquidi Ionici (IL). I DES sono stati utilizzati come solventi per lo studio di reazioni organiche, usate per la formazione di nuovi legami C-C. Nello specifico sono state studiate la reazione di Diels-Alder, e diverse reazioni di coupling C-C catalizzate da Pd. In seguito, i DES sono stati utilizzati per la formazione di nuovi gel supramolecolari, chiamati eutectogel. Questi gel sono stati formati usando come gelator amminoacidi naturali, consentendo quindi …

Green Chemistry Deep Eutectic Solvents Solventi Liquidi Ionici Eutectogel gel supramolecolari Diels-Alder solventi alternativi Reazione di accoppiamento C-C Reazione di Suzuki 5-HMF Biomasse Disidratazione di carboidrati Fruttosio Glucosio Saccarosio Processi Eco-compatibili.Settore CHIM/06 - Chimica OrganicaGreen Chemistry Deep Eutectic Solvents Solvents Ionic Liquids Eutectogel supramolecular gels Diels-Alder alternative solvents Cross Coupling Reaction Suzuki Reaction Sonogashira Reaction Heck Reaction Hiyama Reaction 5-HMF Biomass carbohydrate dehydration Fructose Glucose Saccarose.
researchProduct