Search results for " modifica"
showing 10 items of 817 documents
Recent Advances in the Synthesis of Piperidines: Functionalization of Preexisting Ring Systems
2018
Abstract The present review focuses on strategies for the construction of piperidines which have appeared in the literature since 2003 through mid-2017. In a preceding chapter ( 2017AHC191 ), we summarized synthetic methods involving the construction of the piperidine ring from essentially acyclic starting materials in an intra- or intermolecular manner. The present chapter aims at giving a general overview of decoration or modification of previously generated pyridines or piperidines. The hydrogenation of preformed pyridine or pyridinium rings and introduction of substituents into fully saturated piperidines as well as ring expansion of pyrrolidines to piperidines are the most prevalent me…
Photoinduced functionalization of the C-20 methyl group of the nor-diterpene atractyligenin
2001
Abstract Irradiation of the nor-diterpene atractyligenin at λ =254 nm in methanol gave, on one hand, the decarboxylation product, and provided, on the other hand, the transformation of the C-20 angular methyl into a methylene-carbomethoxy group. A photochemical pathway involving formation of C-19/C-20 bond is suggested.
Surface modification of graphite+polymer composite and ITO electrodes by Nafion®+cupromeronic phthalocyanine films
1999
Abstract The surface of indium tin oxide (ITO) and graphite+polymer composite electrodes can be modified by Nafion ® films containing a little amount of dispersed electroactive substances, such as phthalocyanines. This procedure allows the recovery of electroanalytical information on the electroactive deposited substance. The preparation methods for these types of modified electrodes are discussed from the voltammetric results obtained in this work. The Nafion ® net acts as a permeable membrane to the hydrogen ions. Furthermore, the presence of methylviologen within the Nafion ® film makes the electron transport throughout this membrane easy.
ChemInform Abstract: Functionalization of 2-(1-Naphthyl)-5-phenyl-1,3,4-oxadiazole with Alkoxysilanes.
2010
ChemInform Abstract: Boron Functionalization of BODIPY by Various Alcohols and Phenols
2014
The synthesis of new B–O BODIPY derivatives functionalized with different alkoxy or diarylalkoxy derivatives is described. These compounds were synthesized from the reaction of different B–F BODIPY precursors with various alcohols and phenols, in the presence of AlCl3. Water-soluble dyes could be synthesized as well with this method, specifically by the introduction of polyethyleneglycol (PEG) groups. A photophysical study of the different compounds was performed, and showed that the B–O BODIPY derivatives exhibit rich fluorescence properties. Finally, the conjugation of the BODIPY core has been extended using two distyryl groups, hence providing NIR emitting BODIPY derivatives, in which on…
Synthesis of novel fluorinated building blocks via halofluorination and related reactions.
2020
A study exploring halofluorination and fluoroselenation of some cyclic olefins, such as diesters, imides, and lactams with varied functionalization patterns and different structural architectures is described. The synthetic methodologies were based on electrophilic activation through halonium ions of the ring olefin bonds, followed by nucleophilic fluorination with Deoxo-Fluor®. The fluorine-containing products thus obtained were subjected to elimination reactions, yielding various fluorine-containing small-molecular entities.
The role of the clay in morphology modification of the uncompatible polymer blends
2011
Functionalization of nanoparticles in specific targeting and mechanism release
2017
The development of various nanotechnologies have provided a new field of research, which allows the manipulation of molecular components of matter and covers a vast array of nanodevices. The “smart” multifunctional nanostructures should work as customizable, targeted drug-delivery vehicles capable of carrying large doses of therapeutic agents into malignant cells. Some nanomedical approaches are based on the use of functionalized nanoparticles (NPs), not only to reduce toxicity and side effects of drugs but, also in potential the biological barriers crossing on, such as: the blood–brain barrier, different cellular compartments, including the nucleus. Currently, many materials are used for n…
Verifica del merito creditizio, responsabilità del finanziatore e "indebitamento incauto"
2014
La tesi analizza la nuova disciplina europea sul credito ai consumatori, introdotta dalla direttiva 2008/48/Ce, recepita nel nostro ordinamento con il d.lgs. n. 141/2010, che ha modificato il Testo unico bancario (d.lgs n. 385/1993). In particolare, si sofferma sull'obbligo di verifica del merito creditizio, previsto dall'art. 124 bis Tub, e sulla responsabilità del finanziatore che concede credito senza osservare il disposto della norma suddetta. Dopo aver ascritto alla responsabilità "da contatto sociale" la condotta del prestatore che concede credito in maniera poco accorta (non senza precisare che in ultima istanza la concessione disinvolta di credito avrà riflessi sulle condizioni cont…