Examinando por Autor "Cuenca, Tomás"

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    Ítem
    Selective sulfoxidation with hydrogen peroxide catalysed by a titanium catalyst
    (Royal Society of Chemistry, 2014-08-21) Postigo, Lorena; Ventura, Maria; Cuenca, Tomás; Jimenez, Gerardo; Royo, Beatriz
    A moisture-tolerant cyclopentadienyl-silsesquioxane titanium complex efficiently catalyses the selective oxidation of various types of sulfides to either sulfoxides (TOFs up to 32 530 h(-1)) or sulfones with H2O2 (30% in water) under mild conditions.
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    Ítem
    Synthesis and structural characterization of novel tetranuclear organotitanoxane derivatives
    (Royal Society of Chemistry, 2011-04-21) Ventura, María; Ramirez de Arellano, Carmen; Gómez Mosquera, Marta Elena; Jiménez, Gerardo; Cuenca, Tomás
    Synthesis of the novel titanoxane compounds, [(TiCl)(TiOH){(Ti)[μ-(η5-C5Me4SiMe2O-κO)]2(μ-O)}2(μ-O)] (4) and [{Ti[μ-(η5-C5Me4SiMe2O-κO)](μ-O)}4] (5) by controlled reaction of the dinuclear titanium oxo complex [{Ti{μ-(η5-C5Me4SiMe2O-κO)}Cl]2(μ-O)] (1) with 2 equiv of LiOH is reported. Complex 4 is innovative and remarkable. It is one of the rare known examples of tetranuclear stable terminal hydroxo titanium complexes, with an open-chained structure, which coincides with the transient metal monohydroxo proposed in the stepwise pathway employed to justify the formation of the hexanuclear complex [{Ti[μ-(η5-C5Me4SiMe2O-κO)](μ-O)}6] (3) from 1. 1H DOSY experiments were used to characterize complex 4. In addition, the structures of compound 5 and of precursor 1 were determined by single-crystal X-ray diffraction studies.