Examinando por Autor "Batanero, Belen"

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Highly efficient unbridged D-A+(D) chromophores based on the quinolizinium cation for nonlinear optical (NLO) applications.
(Elsevier, 2022-04-14) Sánchez-Pavón, Esmeralda; Recio, Javier; Ramirez, Marco Antonio; Batanero, Belen; Clays, Koen; Mendicuti, Francisco; Marcelo, Gema; Carmona, Thais; Castaño, Obis; Angelova, Silvia; Andres, Jose L.; Vaquero, Juan J.; Cuadro, Ana M.
Novel charged D-A+ chromophores based on quinolizinium cations as acceptor unit have been prepared by treating haloquinolizinium salts with N-heteroarylstannanes under Stille reaction conditions. This approach provides an easy access to potential one-dimensional D-A+ and two-dimensional D-A+-D chromophores in which the acceptor moiety (A+) is the simple azonia cation and the donors are different π-rich N-heterocycles. The first hyperpolarizabilities (β) were measured by hyper-Rayleigh scattering experiments and the experimental data confirmed that the inherent polarization between donor and acceptor fragments modulates the NLO properties. The electronic structures and properties (including both the linear and nonlinear optical properties) of the quinolizinium chromophores were examined by theoretical (DFT, HF and MP2) calculations. A promising strategy for the rational design of D-A building blocks to create new organic-based NLO materials is proposed.
Microwave-assisted conversion of carbonyl compounds into formylated secondary amines: new contribution to the Leuckart reaction mechanism in N-methylformamide
(ELSERVIER, 2013-04-03) Barba, Fructuoso; Recio, Javier; Batanero, Belen
The reductive amination of several carbonyl compounds (Leuckart reaction) has been performed using Nmethylformamide and microwave technology. Under these conditions, a new mechanism is proposed via the initial formation of an imine, followed by reduction to the amine by ‘in situ’ generated formic acid, and further formylation of the amine. Using this methodology, the formyl derivatives of several secondary amines were obtained in good to excellent yields.
One-pot anodic lactonization of Fenchone and Menthone and electrosynthesis of a new magnolione analogue
(ELSERVIER, 2016-05-25) Batanero, Belen; Recio, Javier; Barba, Fructuoso
The terpenoid cycloalkanones Fenchone and Menthone have been oxidized at a platinumanode under neutral and alkaline electrolyte conditions. When NaClO4 was used as electrolyte, Fenchone (1a) afforded 1-isopropyl-4- methyl-2-oxa-bicyclo[2.2.1]heptan-3-one, and Menthone (1b) provided the stable lactone 6-isobutyl-4- methyl-tetrahydropyran-2-one, both in good yield.When using Na2CO3 as electrolyte, the oxidation of 1a gave the fragrance-analogue 2,2-dimethyl-3-(2-oxopropyl) cyclopentanone in only one-pot. Mechanism proposals are presented.