Correction: Core-substituted naphthalenediimides anchored on BiVO4 for visible light-driven water splitting

Correction for 'Core-substituted naphthalenediimides anchored on BiVO4 for visible light-driven water splitting' by Simelys Hernández et al., Green Chem., 2017, 19, 2448–2462

Using Parahydrogen Induced Polarization to Study Steps in the Hydroformylation Reaction.

A range of iridium complexes, Ir(η3-C3H5)(CO)(PR2R’)2 (1a-1e) [where 1a, PR2R’ = PPh3, 1b P(p-tol)3, 1c PMePh2, 1d PMe2Ph and 1e PMe3] were synthesized and their reactivity as stoichiometric hydroformylation precursors studied. Para-hydrogen assisted NMR spectroscopy detected the following intermediates: Ir(H)2(η3-C3H5)(CO)(PR2R’) (2a-e), Ir(H)2(η1-C3H5)(CO)(PR2R’)2 (4d-e), Ir(H)2(η1-C3H5)(CO)2(PR2R’) (10a-e), Ir(H)2(CO-C3H5)(CO)2(PR2R’) (11a-c), Ir(H)2(CO-C3H7)(CO)2(PR2R’) (12a-c) and Ir(H)2(CO-C3H5)(CO)(PR2R’)2 (13d-e). Some of these species exist as two geometric isomers according to their multinuclear NMR characteristics. The NMR studies suggest a role for the following 16 electron species in these reactions: Ir(η3-C3H5)(CO)(PR2R’), Ir(η1-C3H5)(CO)(PR2R’)2, Ir(η1-C3H5)(CO)2(PR2R’), Ir(CO-C3H5)(CO)2(PR2R’), Ir(CO-C3H7)(CO)2(PR2R’) and Ir(CO-C3H5)(CO)(PR2R’)2. Their role is linked to several 18 electron species in order to confirm the route by which hydroformylation and hydrogenation proceeds

Disseny d'un ànode molecular capaç de realitzar un milió de cicles en la catàlisi d'oxidació d'aigua

L'obtenció de H2 com a vector energètic a partir de l'aigua i l'energia solar és una alternativa interessant als combustibles fòssils. La seva obtenció a través de la dissociació de l'aigua (water splitting) requereix catalitzadors que disminueixin la barrera energètica de les dues semireaccions involucrades: l'oxidació de l'aigua a O2 i la reducció de protons a H2. El desenvolupament de nous catalitzadors permet millorar el coneixement dels mecanismes de reacció i dissenyar-ne de nous amb propietats catalítiques avançades. En aquest treball presentem la immobilització d'un complex molecular altament actiu en l'oxidació de l'aigua, el qual és capaç de fer un milió de cicles catalítics.Molecular hydrogen is a promising candidate for replacing fossil fuels. The production of this gas by water splitting requires catalysts to speed up the respective semi-reactions: oxidation of water to O2 and reduction of protons to H2. The development of these catalysts helps to provide a better understanding of the catalytic pathways, allowing the rational design of new active species. In this study the immobilization of a highly active water oxidation molecular catalyst is achieved, reaching over 1 million TONs under catalytic conditions. Keywords: Water oxidation, catalyst immobilization

Photochemical substitution and bond activation reactions at cyclopentadienyl rhodium : synthesis ; NMR studies

EThOS - Electronic Theses Online ServiceGBUnited Kingdo

A new approach for the preparation of well-defined Rh and Pt nanoparticles stabilized by phosphine-functionalized silica for selective hydrogenation reactions

In this work, a new methodology for the synthesis of well-defined metallic nanoparticles supported on silica is described. This methodology is based on the surface control provided by SOMC. The nanoparticles are formed via the organometallic approach and are catalytically active in the hydrogenation of p-xylene, 3-hexyne, 4-phenyl-2 butanone, benzaldehyde, and furfura

A new approach for the preparation of well-defined Rh and Pt nanoparticles stabilized by phosphine-functionalized silica for selective hydrogenation reactions

In this work, a new methodology for the synthesis of well-defined metallic nanoparticles supported on silica is described. This methodology is based on the surface control provided by SOMC. The nanoparticles are formed via the organometallic approach and are catalytically active in the hydrogenation of p-xylene, 3-hexyne, 4-phenyl-2 butanone, benzaldehyde, and furfura

Comprehensive Chirality

International audienceThe Rh-catalyzed asymmetric hydroformylation is an efficient catalytic reaction that produces chiral aldehydes from inexpensive feedstock (alkenes, syngas) in one step. The elucidation of the different steps of the catalytic cycle and the characterization of the resting state, simultaneously with the discovery of several types of ligands, enable that nowadays, a variety of chiral products are available and this process is now considered a useful tool in organic synthesis. Asymmetric hydroaminomethylation is a one-pot tandem reaction involving hydroformylation and reductive amination leading to chiral amines. The most relevant results concerning these reactions are depicted in this book chapter

Catalysts and process for olefins and polar vinyl monomers copolymerization and olefins homopolymerization

The invention relates to a family of Pd(II)-based catalysts of general formula (I) reproduced below for use in the production of olefin/polar vinyl monomer copolymers and olefin homopolymers. The invention also refers to ligands that are intermediates in the synthesis of the catalysts, to the process for the synthesis of homo- and copolymers using these catalysts, and to the homo- and copolymers thus obtained

Effets de l’approche de réduction du stress Mindfulness Based Stress Reduction (MBSR) sur la santé psychique (stress, anxiété, dépression) et le mode de coping chez des patients diabétiques : une étude pilote contrôlée et randomisée

International audienceRésuméL’approche thérapeutique de pleine conscience Mindfulness Based Stress Reduction (MBSR) s’inscrit dans la troisième vague des thérapies comportementales et cognitives (TCC) et donne lieu à un nombre croissant de recherches. Cette étude a pour but de tester l’impact de cette approche thérapeutique sur la santé psychique (stress, anxiété, dépression, et modes de coping) chez une population de diabétiques de type 1 qui suivent cette prise en charge afin d’augmenter leur capacité à lutter face au stress. Les résultats montrent un effet positif de MBSR sur certains de ces indicateurs (stress perçu, anxiété et modes de coping) et inscrivent cette étude dans le champ de l’efficacité potentielle de cette approche sur la santé psychique en termes d’activation du potentiel et des ressources des patients pour faire face et lutter contre leur maladie. MBSR s’avère être un outil de gestion du stress pertinent pour une population diabétique et augmenter l’autonomie des patients dans la lutte face à cette maladie

Room temperature asymmetric Pd-catalyzed methoxycarbonylation of norbornene: highly selective catalysis and HP-NMR studies

Palladium complexes bearing monodentate and bidentate phosphine ligands (1-7) were synthesised and used as catalyst precursors in the methoxycarbonylation of norbornene. The catalytic systems bearing ligands 1, 3 and 4 afforded excellent conversions (>99%) and selectivity of the ester (>99%). NMR investigations showed that using complex 1a as the precursor resulted in the protonated phosphine, 1-H(+), being formed under catalytic conditions and thus the addition of acid is not required for the activation of this system since the reaction involving the precursor with methanol under CO pressure produces 2 equivalents of HCl and leads to the formation of the active species. The protonation of ligand 4 under methoxycarbonylation conditions was also observed and the diprotonated diphosphine was isolated and characterised. This compound was tested as a ligand and acid source in a catalysis and provided excellent conversion and high selectivity to the ester