Browsing by Author "Manriquez, Juan M."

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    Economical and Simple Preparation of Oleyl Bromide from Commercially Available Olive Oil
    (2017) Preite, Marcelo Daniel; Castillo Suzarte, Francisco Javier; Urbina, Claudia M.; Faúndez Gutiérrez, Rodrigo Esteban; Manriquez, Juan M.; Chávez Madariaga, Ivonne
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    New Rh derivatives of s-indacene active in dehydrogenative silylation of styrene
    (ELSEVIER SCIENCE SA, 2006) Esponda, Edgardo; Adams, Christopher; Burgos, Francisco; Chavez, Ivonne; Manriquez, Juan M.; Delpech, Fabien; Castel, Annie; Gornitzka, Heinz; Riviere Baudet, Monique; Riviere, Pierre
    The mono- and bimetallic complexes [(2,6-diethyl-4,8-dimethyl-s-indacenide){Rh(COD)}] (1), anti-[(2,6-diethyl-4,8-dimethyl-s-indacenediide) {Rh(COD)}(2)] (2a), syn-[(2,6-diethyl-4,8-dimethyl-s-indacenediide){Rh(COD)}(2)] (2b) were synthesized and characterized spectroscopically and in the case of complex 2b, by means of X-ray diffraction. The C-13 and Rh-103 NMR studies suggest that the bonding mode of the indacenediide ligand can be described as intermediate between eta(3)- and eta(5)-coordination. This result was confirmed by the crystal structure of 2b as evidenced by the slippage of the rhodium atom towards the periphery of the ligand. Cyclic voltammetry studies revealed a strong intermetallic communication through the fused ring ligand. This property was further illustrated by higher activity and selectivity of binuclear complexes 2 for the catalytic dehydrogenative silylation of styrene. (c) 2006 Elsevier B.V. All rights reserved.
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    pi-donor/acceptor effect on lindqvist type polyoxomolibdates because of various multiple-bonded nitrogenous ligands
    (AMER CHEMICAL SOC, 2007) Mac Leod Carey, Desmond; Munoz Castro, Alvaro; Bustos, Carlos J.; Manriquez, Juan M.; Arratia Perez, Ramiro
    The electronic structures of Lindqvist type functionalized polyoxometalates (POM) ([Mo6O18R](n-) R = O, NO, NAr, NNAr, NNAr2; n = 2, 3) have been investigated using density functional methods. We discuss the role of the replacement of terminal oxo ligands by pi-donor/acceptor multiple-bonded nitrogenous ligands on the basis of geometrical parameters, charge analyses, reactivity indexes, and vibrational spectra. The calculated reactivity indexes (chemical potential, electronegativity, hardness, and electrophilicity) indicate that the most reactive functionalized POMs are those substituted by pi-acceptor ligands. These pi-acceptor ligands induce a decrease in the hardness and an increase in the chemical potential and electrophilicity, thus increasing the reactivity. Our calculations are in reasonable agreement with reported experimental data.