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Electrochemical catalytic cyclization reactions using environmentally friendly ...
Duñach, E.; Medeiros, M. J.; Olivero, S.The electrochemical intramolecular cyclisation of bromoalkoxylated derivatives 1 was carried out using Ni(II) complexes as the catalysts in ethanol solutions by constant-current electrolysis in one-compartment cell in the absence of sacrificial anodes as an environmentally friendly system. The reduction of the substrates proceeds via one-electron cleavage of the carbon–bromine bond to form radical-type intermed...
Indirect electrochemical cyclisation of bromoalkoxylated derivatives using envi...
Duñach, E.; Medeiros, Maria José; Olivero, S.The electrochemical intramolecular cyclization of bromoalkoxylated derivatives 1 using Ni(II) complex as mediator of electron transfer was carried out in ethanol by constant-current electrolysis in one-compartment cell in the absence of sacrificial anodes as an environmentally friendly systems. It is demonstrated that the electroreduction reaction of bromoalkoxylated derivatives was catalyzed by the electrogene...
Electrosynthesis of nitrogen heterocycles using environmentally friendly method...
Chaminade, X.; Duñach, E.; Esteves, Ana Paula; Medeiros, Maria José; Neves, C. S. S.; Olivero, S.Cyclic voltammetry and constant-current electrolysis in a one-compartment cell with a sacrificial anode has been used to study the indirect electroreduction of N-allyl- -haloamides by electrogenerated Ni(I) complexes conducted inN,N-dimethylformamide (DMF) and acetonitrile (ACN) and the resultswere compared with those obtained in protic solvents such as EtOH and EtOH–H2O mixtures. It was observed that the indir...
Radical-type reactions in protic and aprotic media : comparisons in nickel-cata...
Dunach, E.; Esteves, Ana Paula; Medeiros, Maria José; Neves, C. S. S.; Olivero, S.The electrochemical reductive cyclisation of unsaturated organic halides in the presence of Ni(II) complexes as catalysts was examined in aprotic solvents such as DMF and in protic solvents such as ethanol, butanol or ethanolewater mixtures. The presence of the alcohol media enhanced the rate of recycling of the catalytic species. ; La cyclisation réductive électrochimique d’halogénures insaturés en présence d...
Electrochemical study of nickel(salen) and cobalt(salen) derivatives complexes ...
Duñach, E.; Esteves, Ana Paula; Leite, Luís F. M.; Lemos, Maria A.; Medeiros, Maria José; Olivero, S.The electrochemical intramolecular cyclisation of allyl 2-bromophenyl ethers in N,N'-dimethylformamide at constant current in a diaphragmless cell has been developed using Ni(II) and Co(II) complexes as electron-transfer mediators. Cyclic compounds are obtained in good yields under appropriate experimental conditions.
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