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Synthesis and structural aspects of some intermediates in furofuran lignan synt...
Esteves, Ana Paula; Lemos, Maria A.; Medeiros, Maria José; Rodrigues, Lígia M.The synthesis of some intermediates of furofuran lignans was accomplished by a chemical cyclisation reaction using N-ethylpiperidine hypophosphite and azobisisobutyronitrile. This reaction afforded the 5-exo-dig cyclic compound as the major product along with another isomeric cyclic compound which possess an endocyclic double bond. A brief discussion is presented to explain the formation of these isomeric cycli...
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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