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Acidi Solfonici Supportati come Catalizzatori Eco-efficienti per l’Ossidazione di Baeyer-Villiger con Perossido d’Idrogeno Acquoso al 30%
No full textFriedel-Crafts acylation reaction with anhydrides -Silica supported sulfonic acids as green and efficient heterogeneous catalysts
No full textSince the first paper reported by Friedel and Crafts, the acylation reaction quickly became a fundamental pillar of synthetic organic chemistry at both the academic and industrial levels. In particular, maximum effort has been directed toward the use of solid acid catalysts. Recently the acylation of anisole with acetic anhydride has been carried out with good yield and excellent selectivity by using sulfonic acids tethered onto silica as catalysts. In this work we show the study dealing with the role of different silica supported sulfonic acids in the acylation of aromatics with acetic anhydride, in order to evaluate the effect of the textural properties of the catalysts
Supported sulfonic acids: reusable catalysts for more sustainable oxidative coupling of xanthene-like compounds with nucleophiles
No full textTriethylamine and TBD supported on silica: useful heterogeneous catalysts for the reaction of β-dicarbonyl derivatives with α,β-unsaturated compounds under batch and continuous flow conditions
Get PDFThe synthesis of either mono- or bis-adducts via Michael reaction between active methylene
compounds and α,β-unsaturated reagents is reported. These processes are catalyzed by two
heterogeneous basic catalysts, namely KG-NEt2 and KG-TBD. Both catalysts show good
catalytic efficiency and can be reused several times fully preserving their efficiency. The process
could be efficiently performed under continuous flow conditions obtaining promising results in
term of yield and selectivit
Supported Sulfonic Acid as Green and Efficient Catalyst forBaeyer–Villiger Oxidation with 30% Aqueous HydrogenPeroxide
No full textSilica‐supported propylsulfonic acid is a very good heterogeneous catalyst for the Baeyer–Villiger oxidation
of cyclic ketones to lactones with stoichiometric 30% aqueous hydrogen peroxide in 1,1,1,3,3,3‐hexafluoro‐
2‐propanol as solvent
Oxidation of alkenes to 1,2-diols: FT-IR and UV studies of silica-supported sulfonic acid catalysts and their interaction with H2O and H2O2
Get PDFHighly chemoselective metal-free oxidations with diluted H2O2 in continuous flow reactors
No full textOxidation of Hydroquinones to Benzoquinones with Hydrogen Peroxide Using Catalytic Amount of Silver Oxide under Batch and Continuous-flow Conditions
No full textSilver oxide (Ag2O) can be utilized as heterogeneous catalyst in the oxidation of hydroquinones to the
corresponding benzoquinones with 30% aq. H2O2. The catalytic properties of Ag2O have been explored in
the model reaction of methylhydroquinone with H2O2 performed under batch conditions. Results show that
the reaction can be carried out in high yield and selectivity at room temperature under environmentally
friendly conditions. The truly heterogeneous catalyst can be recovered by filtration and reused for at least
five times, giving the same excellent results (∼95% yield, ∼98% selectivity). The catalyst can be packed in a
tubular reactor and utilized under continuous‐flow conditions giving similar good results
Ossidazione in Catalisi Eterogenea di Idrochinoni con H2O2 30%: un Confronto fra Catalizzatori Organici Supportati e Ossidi Metallici
No full textHighly chemoselective metal-free oxidation of sulfides with diluted H2O2 in a continuous flow reactor
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