Luigi Lopez
University of Bari
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Publication
Featured researches published by Luigi Lopez.
Tetrahedron Letters | 2000
Vincenzo Calò; Angelo Nacci; Luigi Lopez; Nicola Mannarini
Abstract A Pd-catalyst with benzothiazole carbene ligands allows, in ionic liquids as solvent, very fast and efficient reactions of haloaromatics with alkenes.
Tetrahedron | 2001
Vincenzo Calò; Angelo Nacci; Antonio Monopoli; Luigi Lopez; Anna di Cosmo
Abstract A Pd-catalyst with benzothiazole carbene as ligands allows, in tetrabutylammonium bromide melt as solvent, very fast and efficient reactions of haloaromatics with β-substituted acrylates.
Tetrahedron Letters | 2001
Vincenzo Calò; Angelo Nacci; Luigi Lopez; Annalisa Napola
Abstract A Pd-catalyst with benzothiazole carbene as ligands allows, in tetrabutylammonium bromide melt as solvent, very fast and efficient reactions of bromoaromatics with 3-hydroxy-2-methylenealkanoates to give β-arylketones.
Tetrahedron | 1995
Piero Mastrorilli; Cosimo Francesco Nobile; Gian Paolo Suranna; Luigi Lopez
Abstract Aerobic epoxidation of unsaturated substrates has been achieved under Mukaiyamas conditions (atmospheric pressure of dioxygen, in the presence of an excess of sacrificial aldehyde) with or without metal catalyst. The influence of light in non-catalysed reactions and the possible role of the aldehyde and of the metal complex in catalysed reactions are discussed. Two mechanistic pathways are proposed for Co(II) and Fe(III) [Ni(II)] catalytic centres.
Tetrahedron Letters | 1989
Luigino Troisi; Luigi Cassidei; Luigi Lopez; Rossella Mello; Ruggero Curci
Abstract Isolated methyl trifluoromethyl dioxirane 4b has been employed to achieve the rapid, low temperature epoxidation of enol ethers, such as alkoxy(aryl)methylidene adamantanes 1a–e and methoxy(2-naphthyl)methylidene 2-bornane 1f , affording the corresponding spirooxiranes in excellent (92–97%) yields.
Tetrahedron Letters | 2000
Vincenzo Calò; Angelo Nacci; Luigi Lopez; Vito Luigi Lerario
Abstract The reaction of β-oxosulfides of benzothiazole with Michael acceptors, in liquid tetrabutylammonium bromide and sodium bicarbonate as base, allows a stereoselective synthesis of spirocyclopropanes.
Tetrahedron Letters | 1989
Luigi Lopez; Luigino Troisi
Abstract One electron oxidizing agents have been employed to achieve the isomerization of epoxides to ketones. The reactions most likely proceed via a radical cation chain electron-transfer mechanism.
Tetrahedron | 1973
Vincenzo Calò; Luigi Lopez; G. Pesce; Paolo E. Todesco
Abstract Selective bromination of α,β-unsaturated ketones has been achieved by the action of 2,4,4,6-tetrabromocyclohexa-2,5-dienone. The stereochemistry, conformation and relative stability of the bromination products of some steroidic unsaturated ketones have been also determined.
Journal of Molecular Catalysis A-chemical | 1996
Maria Michela Dell'Anna; Piero Mastrorilli; Cosimo Francesco Nobile; Luigi Lopez
Abstract Aromatic α-hydroxyketones were easily oxidized by dioxygen in the presence of excess aldehyde or aldoacetal with catalytic amount of Co(II) or Fe(III) complexes, under homogeneous and heterogeneous conditions. Co(acac) 2 or Fe(acac) 3 were the catalysts used in homogeneous phase reactions whereas Co(II) or Fe(III) supported complexes, obtained by copolymerization of Co(AAEMA) 2 or Fe(AAEMA) 3 (AAEMA − = deprotonated form of 2-(acetoacetoxy)ethyl methacrylate) with acrylamides, were the heterogeneous catalysts. The supported metal complexes were recyclable and did not suffer from metal leaching.
Tetrahedron | 1994
Luigi Lopez; Giuseppe Mele; Vito Fiandanese; Cosimo Cardellicchio; Angelo Nacci
Abstract β-ionone and α-pinene oxides 1, 3 isomerize rapidly and selectively to 1-(1,2,2-trimethylcyclopent-1-yl)-pent-2-en-1,4-dione 2 and the industrialy important 2,2,3-trimethyl-3-cyclopentene acetaldehyde 4 . under the influence of catalytic amounts of aminium salts A,B . In order to find insights into the mechanism of our procedure, protic and Lewis acid-catalyzed rearrangements have also been reconsidered.