En esta comunicación se describe el desarrollo de una metodología de enseñanza consistente en guiar a los estudiantes en su aprendizaje a través de la resolución de una serie de fichas proporcionadas por la profesora. En estas fichas se plantean diferentes actividades consistentes en lecturas y visualización de vídeos seguidos de...
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May 15, 2019 (v1)PublicationUploaded on: March 27, 2023
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May 25, 2023 (v1)Publication
Chemistry and biochemistry instructors must help students to develop the ability to visualize and manipulate 3D biomolecular structures and critically analyze them and their relationship to their functions. To do this, representative systems must be strategically selected to stimulate students' motivation. Since the World Health Organization...
Uploaded on: May 26, 2023 -
September 5, 2022 (v1)Publication
Metal-only Lewis pairs made of Pt(0)/Ag(I) combinations have been previously reported, but their cooperative reactivity remains unexplored. Here we demonstrate that these systems are capable of synergistically activating a wide variety of X–H (X = H, C, O, N) bonds, including those in dihydrogen, alkynes, water and ammonia.
Uploaded on: December 4, 2022 -
July 18, 2024 (v1)Publication
El objetivo del trabajo es analizar la eficacia de la metodología del aprendizaje basado en problemas (ABP) en una titulación del grupo de las STEM, en concreto en tres asignaturas de 1º, 2º y 3º del Grado en Química de la Universidad de Sevilla. Las clases se convierten para los estudiantes en un lugar de trabajo en grupo en el que deben...
Uploaded on: July 19, 2024 -
March 6, 2023 (v1)Publication
Aryl-Pd(ii) chlorides stabilized by dialkylterphenyl phosphine ligands undergo a thermal isomerization process, leading to the formation of allyl-Pd(ii)-chloride species. The transformation involves the intramolecular functionalization of a C-H bond of the terphenyl group mediated by the Pd(ii) center.
Uploaded on: March 25, 2023 -
March 6, 2023 (v1)Publication
A series of 2-aminobiphenyl palladacycles supported by dialkylterphenyl phosphines, PR2Ar′ (R=Me, Et, iPr, Cyp (cyclopentyl), Ar′=ArDipp2, ArXyl2f, Dipp (2,6-C6H3-(2,6-C6H3-(CHMe2)2)2), Xyl=xylyl) have been prepared and structurally characterized. Neutral palladacycles were obtained with less bulky terphenyl phosphines (i.e., Me and Et...
Uploaded on: March 25, 2023 -
February 7, 2018 (v1)Publication
A stable Nickel(II) methyl complex containing a diphosphinoboryl (PBP) pincer ligand is described. Mechanistic studies on the hydrogenolysis of the Ni-Me bond suggest a metal ligand cooperation mechanism that involves the intermediacy of a - B‒H Ni(0) species that further undergoes B‒H oxidative addition to form a Ni(II) hydride complex.
Uploaded on: December 5, 2022 -
September 9, 2022 (v1)Publication
Metal-only Lewis pairs (MOLPs) based on zinc electrophiles are particularly interesting due to their relevance to Negishi cross-coupling reactions. Zinc-based ligands in bimetallic complexes also render unique reactivity to the transition metals at which they are bound. Here we explore the use of sterically hindered [Pt(PtBu3)2] (1) to access...
Uploaded on: March 24, 2023 -
March 6, 2023 (v1)Publication
Despite the excellent catalytic properties display by NHC-Pd-PEPPSI complexes in cross-coupling, phosphane analogs have been barely screened. In this work, we report the synthesis and characterization of a series of LPdCl2(amine) complexes bearing dialkylterphenyl phosphanes (PR2Ar′) and pyridine or morpholine ligands. The novel compounds have...
Uploaded on: March 25, 2023 -
February 23, 2023 (v1)Publication
Introducing transition metals into frustrated Lewis pair systems has attracted considerable attention in recent years. Here we report a selection of three metal-only frustrated systems based on Au(I)/Pt(0) combinations and their reactivity toward alkynes. We have inspected the activation of acetylene and phenylacetylene. The gold(I) fragments...
Uploaded on: March 1, 2023 -
December 21, 2023 (v1)Publication
Pt(II) alkylidene 1a has been reacted with terminal alkynes to afford ylide complexes 3a-d, resulting from electrophilic activation of the C≡C bond and its insertion into the platinacyclic fragment of 1a that contains the carbene functionality. DFT calculations indicate that the observed regioselectivity is determined by the nucleophilic attack...
Uploaded on: December 25, 2023 -
October 24, 2022 (v1)Publication
A joint experimental/computational effort to elucidate the mechanism of dihydrogen activation by a gold(I)/platinum(0) metal-only frustrated Lewis pair (FLP) is described herein. The drastic effects on H2 activation derived from subtle ligand modifications have also been investigated. The importance of the balance between bimetallic adduct...
Uploaded on: March 24, 2023 -
December 14, 2021 (v1)Publication
Ni-catalyzed C−S cross-coupling reactions have received less attention compared with other C-heteroatom couplings. Most reported examples comprise the thioetherification of most reactive aryl iodides with aromatic thiols. The use of C−O electrophiles in this context is almost uncharted. Here, we describe that preformed Ni(II) precatalysts of...
Uploaded on: December 4, 2022 -
September 21, 2018 (v1)Publication
Cationic five-coordinate Pt(IV) alkyl complexes stabilized by bulky N-heterocyclic carbenes have been isolated and fully characterized. Related species have been postulated as key intermediates in carbon–heteroatom coupling reactions and most particularly in Shilov-type chemistry. The alkyl groups exhibit a pronounced electrophilic character...
Uploaded on: March 27, 2023 -
June 22, 2020 (v1)Publication
A straightforward method for the preparation of trisphosphinite ligands in one step, using only commercially available reagents (1,1,1-tris(4-hydroxyphenyl)ethane and chlorophosphines) is described. We have made use of this approach to prepare a small family of four trisphosphinite ligands of formula [CH3C{(C6H4OR2)3], where R stands for Ph...
Uploaded on: December 5, 2022 -
January 30, 2023 (v1)Publication
The synthesis of novel fluorinated symmetrical and unsymmetrical imidazolium salts as well as their corresponding coinage metal complexes is described. The silver derivatives were prepared using Ag2O as the metal source and the subsequent (NHC)AgX complexes were successfully employed in the preparation of the corresponding Cu(I) and Au(I)...
Uploaded on: March 1, 2023 -
March 6, 2023 (v1)Publication
Bulky terphenyl phosphane ligands PMe2Ar′ (Ar′ = terphenyl group) facilitate the isolation of zero-valent bis-phosphane complexes of nickel, palladium and platinum. The former show coordination numbers greater than two in the solid state due to the existence of Ni-Careneinteractions with the terphenyl fragment.
Uploaded on: March 25, 2023 -
June 5, 2018 (v1)Publication
We describe the synthesis and the molecular and electronic structures of the complex [Mo2Me2{μ‐HC(NDipp)2}2] (2; Dipp=2,6‐iPr2C6H3), which contains a dimetallic core with an Mo–Mo quadruple bond and features uncommon four‐coordinate geometry and has a fourteen‐electron count for each molybdenum atom. The coordination polyhedron approaches a...
Uploaded on: December 5, 2022 -
May 30, 2018 (v1)Publication
Complex [PtMe(PMeAr)] (1), which contains a tethered terphenyl phosphine (Ar =2,6-(2,6-PrCH)CH), reacts with [H(EtO)]BAr (BAr =B[3,5-(CF)CH] ) to give the solvent (S) complex [PtMe(S)(PMeAr)] (2⋅S). Although the solvent molecule is easily displaced by a Lewis base (e.g., CO or CH) to afford the corresponding adducts, treatment of 2⋅S with CH...
Uploaded on: March 27, 2023 -
June 27, 2022 (v1)Publication
The reactions of LiAlH4 as the source of LiH with complexes that contain (H)Mo≣Mo and (H)Mo≣Mo(H) cores stabilized by the coordination of bulky AdDipp2 ligands result in the respective coordination of one and two molecules of (thf)LiH, with the generation of complexes exhibiting one and two HLi(thf)H ligands extending across the Mo≣Mo bond...
Uploaded on: March 25, 2023 -
October 1, 2019 (v1)Publication
The experimental and computational characterization of a series of dialkylterphenyl phosphines, PR2Ar′ is described. The new P‐donors comprise five compounds of general formula PR2Arurn:x-wiley:09476539:media:chem201803598:chem201803598-math-0001 (R=Me, Et, iPr, c‐C5H9 and c‐C6H11);...
Uploaded on: December 4, 2022 -
March 6, 2023 (v1)Publication
Neutral and cationic N-methyl- and N-phenyl-2-aminobiphenyl methanesulfonate palladacycles stabilized with dialkylterphenyl phosphanes have been prepared and characterized. Neutral structures are favored with the less bulky phosphane PMe2ArXyl2, L1, while more sterically demanding ligands PiPr2ArXyl2, L3, and PCyp2ArXyl2 (Cyp = cyclopentyl),...
Uploaded on: March 25, 2023