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601 results on '"Vasapollo, Giuseppe"'

20. Palladium-catalyzed asymmetric cyclocarbonylation of allyl naphthols

Author

Vasapollo, Giuseppe and Mele, Giuseppe

Subjects
Palladium -- Chemical properties, Palladium -- Research, Lactones -- Chemical properties, Lactones -- Research, Ring formation (Chemistry) -- Analysis
Abstract

The asymmetric cyclocarbonylation reaction of allyl naphthol catalyzed by palladium complexes and chiral phosphine is reported. The reaction was performed under syn-gas conditions at relatively mild experimental conditions (80-100 [degrees]C, 300-600 psi (1 psi = 6.895 kPa)) in C[H.sub.2][Cl.sub.2] as the solvent. Key words: enantioselective, carbonylation, cyclocarbonylation, lactones, palladium acetate. On a realise la reaction de cyclocarbonylation asymetrique de l'allylnaphtol catalysee par des complexes du palladium et une phosphine chirale. La reaction a ete effectuee dans des conditions syn-gaz, en utilisant le dichloromethane comme solvant et des conditions experimentales relativement douces (80 a 100 [degrees]C, 300 a 600 psi (1 psi = 6,895 kPa)). Mots cles : enantioselective, carbonylation, cyclocarbonylation, lactones, acetate de palladium. [Traduit par la Redaction]

Published
2005

22. Highly regioselective thiocarbonylation of conjugated dienes via palladium-catalyzed three-component coupling reactions

Author

Xiao, Wen-Jing, Vasapollo, Giuseppe, and Alper, Howard

Subjects
Organic compounds -- Synthesis, Alkadienes -- Research, Chemical reactions -- Analysis, Organosulfur compounds -- Research, Biological sciences, Chemistry
Abstract

Research reveals that the palladium catalytic system is very efficient for the carbonylative coupling reactions to form beta, gamma-unsaturated thioesters. Data indicate that the reactions involve conjugated dienes, thiols, and carbon monoxide and proceed with good stereoselectivity.

Published
2000

23. Highly chemo- and regioselective thiocarbonylation of conjugated enzymes with thiols and carbon monoxide catalyzed by palladium complexes: an efficient and atom-economical access to 2-(phenylthiocarbonyl)-1,3-dienes

Author

Xiao, Wen-Jing, Vasapollo, Giuseppe, and Alper, Howard

Subjects
Organic compounds -- Research, Thiols -- Research, Catalysis -- Research, Biological sciences, Chemistry
Abstract

Highly chemo- and regioselective thiocarbonylation of conjugated enynes with thiols and carbon monoxide catalyzed by palladium complexes was examined as an access to 2-(phenylthiocarbonyl)-1,3- dienes. The results suggested that the reaction of 1, 3-conjugated enynes bearing a terminal triple bond with thiols and carbon monoxide catalyzed by palladium complexes gave 2-(phenylthiocarbonyl)1,3-dienes in moderate to good yields.

Published
1999

25. Highly regioselective palladiuim-catalyzed thiocarbonylation of allenes with thiols and carbon monoxide

Author

Xiao, Wen-Jing, Vasapollo, Giuseppe, and Alper, Howard

Subjects
Thiols -- Research, Carbon monoxide -- Research, Palladium -- Research, Chemical bonds -- Research, Biological sciences, Chemistry
Abstract

A study was conducted to analyze the palladium-catalyzed reactions of allenes with thiols and carbon monoxide. A Varian gemini 200 and Bruker AMX 250 spectrometers were utilized to record 1H nuclear magnetic resonance (NMR) and 13C NMR spectra. Results indicated that the reactions supported high regioselectivity and also showed that the thiopehyn group contributes to the less substituted double bond of allenes.

Published
1998

26. Regioselective palladium(II)-catalyzed synthesis of five- or seven-membered ring lactones and five-, six- or seven-membered ring lactams by cyclocarbonylation methodology

Author

Ali, Bassam el-, Okuro, Kazumi, Vasapollo, Giuseppe, and Alper, Howard

Subjects
Palladium catalysts -- Usage, Lactones -- Research, Heterocyclic compounds -- Research, Chemistry
Abstract

A cationic palladium complex or palladium acetate catalyzes the regioselective cyclocarbonylation of 2-allylphenols in the presence of 1,4-bis(diphenylphosphine)butane, to give five- or seven-membered ring lactones under hydroformylation conditions. Cyclocarbonylation of 2-aminostyrenes in the presence of palladium acetate catalyst and tricyclohexylphosphine leads to five-, six- and seven-membered ring lactams. Reaction between 2-allylanilines, CO and H2 in palladium acetate catalyst and PPh3 produces bi- and tri-cyclic heterocycles with six-membered lactam rings.

Published
1996

33. Preparation of Novel Hybrid Materials Containing Bioactive Compounds Embedded in Cardanol-Based Vesicular Nanodispersions

Author

BLOISE, ERMELINDA, MERGOLA, LUCIA, MELE, Giuseppe Agostino, VASAPOLLO, Giuseppe, Behalo, Mohamed Sayed, Bloise, Ermelinda, Mergola, Lucia, Behalo, Mohamed Sayed, Mele, Giuseppe Agostino, and Vasapollo, Giuseppe

Abstract

Cardanol (CA) is a natural and renewable organic raw material obtained as the major by-product from the distillation of cashew nut shell liquid (CNSL). Thanks to its amphiphilic properties under alkaline conditions, was developed an environmental-friendly technology to produce engineered “green nanocarriers”, without use of any organic solvents, in which CA acts as the solvent as well as being the main component of the nanodispersions.

Published
2014

35. Green Nanocarriers for Epithelial Tumours Treatment

Author

BLOISE, ERMELINDA, MELE, Giuseppe Agostino, MERGOLA, LUCIA, PICCINNI, BARBARA, ROMANO, ALESSANDRO, VASAPOLLO, Giuseppe, VERRI, Tiziano, Bloise, Ermelinda, Mele, Giuseppe Agostino, Mergola, Lucia, Piccinni, Barbara, Romano, Alessandro, Vasapollo, Giuseppe, and Verri, Tiziano

Abstract

Nanotechnology has been utilized recently in medicine for the development of Drug Delivery Systems able to alter the kinetic profile of drug release that is very important in the administration of therapies for long periods as chemotherapy treatments, preventing damages to the normal surrounding tissue. This work aims to test new types of engineered green nanocarriers produced by an environmentalfriendly procedure for epithelial tumors treatment. Epithelial cancer is the largest single cause of death in both men and women, claiming over 6 million lives each year worldwide. For this reason, recently nanotechnology is attracting great interest in the search for new cancer therapies.

Published
2014

36. Developments of New Hg(II)-Imprinted Polymer Beads: Adsorption Performances And Morphological Characterization

Author

MERGOLA, LUCIA, SCORRANO, SONIA, BLOISE, ERMELINDA, VASAPOLLO, Giuseppe, Sole, Roberta Del, Bello, Maria Pia Di, Mergola, Lucia, Scorrano, Sonia, Sole, Roberta Del, Bloise, Ermelinda, Bello, Maria Pia Di, and Vasapollo, Giuseppe

Abstract

Environmental problems associated with water pollution, are today a serious problem that has attracted great attention of the global community. In particular, the release of various harmful heavy metal ions owing to industrial and agricultural processes represent today the main cause of pollution [1]. Mercury is one of the most hazardous elements for human health for its relatively solubility in water and living tissues. Common methods used for mercury separation from water samples include, liquid-liquid extraction [2], solid-liquid extraction [3], flotation [4] and membrane filtration [5] Moreover, many synthetic polymers opportunely functionalized by impregnation [6], grafting of commercial sorbents [7] or of home-made polymers [8] were prepared. However, a good selectivity is difficult to achieve with the previously mentioned materials. For this reason, highly selective Hg(II) imprinted polymers were prepared using different synthesis approaches and a correlation between the adsorption behavior and morphological characteristics of all polymers was made. Finally, selectivity studies using a mixture of different metal ions, were carried out.

Published
2014

37. TRMC, XPS, and EPR characterizations of polycrystalline TiO2 porphyrin impregnated powders and their catalytic activity for 4-nitrophenol photodegradation in aqueous suspension

Author

Mele, Giuseppe, Sole, Roberta Del, Vasapollo, Giuseppe, Marci, Giuseppe, Garcia-Lopez, Elisa, Palmisano, Leonardo, Coronado, Juan M., Hernandez-Alonso, Maria D., Malitesta, Cosimino, and Guascito, Rachele

Subjects
Electron paramagnetic resonance -- Analysis, X-ray spectroscopy -- Analysis, Titanium dioxide -- Optical properties, Chemicals, plastics and rubber industries
Abstract

Characterization of polycrystalline TiO2 bare or phyrin impregnated powders, used as photocatalysts for the degradation of 4-nitophenol (4-NP) in aqueous suspension, was performed by time-resolved microwave (TRMC) conductivity measurements and electronic paramagnetic resonance and X-ray photoelectron spectroscopies. TRMC measurements indicate that the number and lifetime of the photoinduced excess charge carriers increase in the presence of the macrocycles and EPR and XPS spectroscopies support the mechanistic hypotheses based on the photoreactivity experiments.

Published
2005

39. Photocatalytic Degradation of 4-Nitrophenol by Using Porphyrin/Fe-Loaded TiO2 Composites Under Heterogeneous Photo Fenton Process

Author

MELE, Giuseppe Agostino, PIO, IOLANDA, SCARLINO, ANNA, BLOISE, ERMELINDA, PALMISANO, Leonardo, VASAPOLLO, Giuseppe, Mele, G, Pio, I, Scarlin, A, Bloise, E, Palmisano, L, Vasapollo, G, Mele, Giuseppe Agostino, Pio, Iolanda, Scarlino, Anna, Bloise, Ermelinda, Palmisano, Leonardo, and Vasapollo, Giuseppe

Subjects
TiO2, photocatalysis, Porphyrin
Abstract

A new class of porphyrin(Pp)/Fe co-loaded TiO2 composites opportunely prepared by impregnation of [5,10,15,20-tetra(4-tert-butylphenyl)] porphyrin (H2Pp) or Cu(II)[5,10,15,20-tetra(4-tert-butylphenyl)] porphyrin (CuPp) onto Fe-loaded TiO2 particles showed high activities toward the degradation of 4-nitrophenol (4-NP) by heterogeneous photo Fenton-like processes.

Published
2012

42. Fundamentals of Chemical Technologies for green energy production: dye-sensitized solar cells

Author

CICCARELLA, Giuseppe, SCRASCIA, ANGELA, LARICCHIA, SAVIO, VASAPOLLO, Giuseppe, A. Capodilupo, Autori Vari, Ciccarella, Giuseppe, Scrascia, Angela, A., Capodilupo, Laricchia, Savio, and Vasapollo, Giuseppe

Subjects
green energy, nano TiO2, dye-sensitized solar cell
Abstract

The increasing demand for power supply as well as environmental concern for the consumption of fossil fuel have triggered global research on the development of clean and renewable energy sources. Due to their low costs, DSSC devices appear to be a good alternative to the siliconbased solar cells. Up to now, intensive researches were performed in order to increase the photoconversion efficiency. Typical DSSCs consist of a dyed semiconductor TiO2 photoelectrode, a Pt counter electrode and redox electrolyte. Photosensitizer played a crucial role in these devices and it is fundamental to the cell’s performance and stability. It absorb visible light and inject electrons into the conduction band of the TiO2 after solar light excitation and thus generate the photocurrent via redox mediator in electrolytes. In this presentation it will be reported the contribution of the “Fundamentals of Chemical Technologies” group in Lecce to the development of high performing materials for Dye Sensitized Solar Cells.

Published
2012

44. FINE CHEMICALS FROM WASTE: THE CASE OF CNSL

Author

VASAPOLLO, Giuseppe, MELE, Giuseppe Agostino, DEL SOLE, Roberta, BLOISE, ERMELINDA, I, . PIO, Vasapollo, Giuseppe, Mele, Giuseppe Agostino, I, . PIO, DEL SOLE, Roberta, and Bloise, Ermelinda

Published
2011

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