1,721,002 research outputs found
Funzionalizzazione di molecole organiche effettuate in CO2 supercritica come mezzo di reazione
Full text linkSustainable development is now accepted by the society as a necessary target for achieving societal, economic and environmental objectives. Within this, chemistry has a key role to play in maintaining and improving our quality of life, the competitiveness of the chemical industry and the natural environment.
Chemical transformations such as alcohols oxidation produce large amount of hazardous waste. Catalysis being finest upon stoichiometrical synthesis seems to be a solution for selectivity, energetic and environmental concern. Similarly, the elimination of carcinogenic and bioaccumulating chlorinated (or aromatic)
solvents in which these conversions are generally carried out is also highly desirable since, despite their relatively low price, solvents have a considerable life-cycle impact and the broader total costs of these typical volatile organic compounds (VOCs) are nonetheless high and constantly increasing. New, atomefficient heterogeneously catalysed oxidation processes in alternative reaction media are thus intensively investigated in current academy's and industry's research focusing on the immobilization of aerobic metal catalysts and on supercritical carbon dioxide (sc-CO2) or ionic liquids as reaction solvents. Hence, my Ph.D. research has been spent on develop systems for aerobic alcohols oxidation catalysed by tetrapropylammonium perruthenate (TPAP) or nanostructured palladium
UN’ALTERNATIVA “GREEN” AL TOLUENE
No full textIl ciclopentil metil etere, un solvente dal ridotto impatto ambientale (economicità atomica nella sintesi, bassa tossicità, ridotta formazione di perossidi, basso calore di vaporizzazione, elevata Teb, facilità di riciclo), è stato utilizzato con successo nella sintesi di acetali in condizioni di Dean-Stark
A Green Alternative to Toluene
Cyclopentyl methyl ether, a solvent endowed with low environmental impact properties (atom economic synthesis, low toxicity, high boiling point, resistant to peroxide formation, low heat of vaporization, narrow explosion range, highly hydrophobic, easy drying), was successfully employed in the synthesis of acetals under Dean-Stark reaction conditions
Active-alkali metal promoted reductive desulfurization of dibenzothiophene and its hindered analogues
Full text linkReductive desulfurisation of organic compounds is of importance both in organic synthesis and in industry. Benzo- and dibenzothiophenes are between the most abundant sulphur containing impurities in crude oils, and their desulfurization is a mandatory issue in the production of non polluting fuels. Following our interest in the development of efficient alkali metal-mediated synthetic procedures and alternative protocols for the chemical transformation of widespread environmental contaminants we wish to report here on the effectiveness of sodium and lithium metals, in the presence of catalytic amounts of tetraphenylethylene (TPE), in promoting the reductive
desulfurization of dibenzothiophene, as well as of the corresponding sulfone and sulfoxide
Nanocostrutti comprendenti nanoparticelle lipidiche solide rivestite da un guscio idrofilo
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Sol-gel entrapped TPAP: An off-the-shelf catalyst set for the clean oxidation of alcohols
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A Mechanistic Study on Alcohol Oxidations with Oxygen Catalysed by TPAP-Doped Ormosils in Supercritical Carbon Dioxide
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