Publications by authors named "Esther Roldan-Molina"

4 Publications

  • Page 1 of 1

Impact of Pore Size and Defects on the Selective Adsorption of Acetylene in Alkyne-Functionalized Nickel(II)-Pyrazolate-Based MOFs.

Chemistry 2021 Jun 11. Epub 2021 Jun 11.

Departamento de Química, Universidad de Granada, Av. Fuentenueva S/N, 18071, Granada, Spain.

C H /CO separation is a highly challenging process as a consequence of their similar physicochemical properties. In this work we have explored, by static and dynamic gas sorption techniques and computational modelling, the suitability of a series of two isoreticular robust Ni(II)pyrazolate-based MOFs, bearing alkyne moieties on the ligand backbones, for C H /CO separation. The results are consistent with high adsorption capacity and selectivity of the essayed systems towards C H molecules. Furthermore, a post-synthetic treatment with KOH ethanolic solution gives rise to linker vacancy defects and incorporation of extraframework potassium ions. Creation of defects is responsible for increased adsorption capacity for both gases, however, strong interactions of the cluster basic sites and extraframework potassium cations with CO molecules are responsible for a lowering of C H over CO selectivity.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1002/chem.202100821DOI Listing
June 2021

CpTiCl -Catalyzed Cross-Coupling between Internal Alkynes and Ketones: A Novel Concept in the Synthesis of Halogenated, Conjugated Dienes.

Chemistry 2020 Jul 9;26(37):8296-8301. Epub 2020 Jun 9.

Department of Organic Chemistry, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, 18071, Granada, Spain.

A novel concept for the synthesis of halogenated, conjugated dienes is disclosed: the CpTiCl -catalyzed coupling of keto-alkynes, in the presence of Me SiBr/Et N⋅HBr. This reaction provided five-, six-, and seven-membered carbocycles, nitrogenated heterocycles, as well as six-membered oxygenated heterocycles leading to a brominated conjugate diene. These products showed high reactivity in the Diels-Alder, Suzuki, and Sonogashira reactions, giving complex chemical structures in only three steps from the corresponding acyclic keto-alkyne. Hopefully, this strategy will pave the way towards the synthesis of bioactive natural products and new materials.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1002/chem.202001023DOI Listing
July 2020

Synthesis of (±)-aureol by bioinspired rearrangements.

J Org Chem 2015 Feb 27;80(3):1866-70. Epub 2015 Jan 27.

Department of Organic Chemistry, Faculty of Sciences, University of Granada , 18071 Granada, Spain.

A bioinspired and sustainable procedure for the straightforward synthesis of (±)-aureol has been achieved in eight steps (14% overall yield) from epoxyfarnesol. The key steps are the titanocene(III)-catalyzed radical cascade cyclization of an epoxyfarnesol derivative and a biosynthetically inspired sequence of 1,2-hydride and methyl shifts.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/jo502841uDOI Listing
February 2015

Selective reduction of aromatic ketones in aqueous medium mediated by Ti(III)/Mn: a revised mechanism.

J Org Chem 2014 Aug 21;79(16):7672-6. Epub 2014 Jul 21.

Departamento Química Orgánica, Facultad de Ciencias, Universidad de Granada , Campus Fuentenueva s/n, 18071 Granada, Spain.

An experimental study on the role played by each of the reagents involved in the selective reduction of aromatic ketones in aqueous medium is reported. In this reaction, the reduction of aromatic ketones is mediated by Cp2TiCl. Moreover, the presence of Mn in the reaction medium is mandatory. To account for these findings, a substantially revised mechanism is proposed.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1021/jo501141yDOI Listing
August 2014
-->