Gotowe bibliografie tematyczne / Metal Mediated Catalysis

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Gotowa bibliografia na temat „Metal Mediated Catalysis”

Autor: Grafiati

Data publikacji: 7 września 2023

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Artykuły w czasopismach na temat "Metal Mediated Catalysis"

Leven, Matthias, Jörg M. Neudörfl i Bernd Goldfuss. "Metal-mediated aminocatalysis provides mild conditions: Enantioselective Michael addition mediated by primary amino catalysts and alkali-metal ions". Beilstein Journal of Organic Chemistry 9 (23.01.2013): 155–65. http://dx.doi.org/10.3762/bjoc.9.18.

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Four catalysts based on new amides of chiral 1,2-diamines and 2-sulfobenzoic acid have been developed. The alkali-metal salts of these betaine-like amides are able to form imines with enones, which are activated by Lewis acid interaction for nucleophilic attack by 4-hydroxycoumarin. The addition of 4-hydroxycoumarin to enones gives ee’s up to 83% and almost quantitative yields in many cases. This novel type of catalysis provides an effective alternative to conventional primary amino catalysis were strong acid additives are essential components.

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Bennett, Jeffrey A., Bradley A. Davis, Kirill Efimenko, Jan Genzer i Milad Abolhasani. "Network-supported, metal-mediated catalysis: progress and perspective". Reaction Chemistry & Engineering 5, nr 10 (2020): 1892–902. http://dx.doi.org/10.1039/d0re00229a.

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Astruc, D. "Organometallic chemistry at the nanoscale. Dendrimers for redox processes and catalysis". Pure and Applied Chemistry 75, nr 4 (1.01.2003): 461–81. http://dx.doi.org/10.1351/pac200375040461.

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An overview of the metal-mediated synthesis and use of nanosized metallodendrimers is given with emphasis on electron-transfer processes (molecular batteries consisting in dendrimers decorated with a large number of equivalent redox-active centers) and catalytic reactions (electron-transfer-chain catalytic synthesis of dendrimers decorated with ruthenium carbonyl clusters, redox catalysis of nitrate and nitrite electroreduction in water by star-shape hexanuclear catalysts).

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Pagliaro, Mario, Cristina Della Pina, Francesco Mauriello i Rosaria Ciriminna. "Catalysis with Silver: From Complexes and Nanoparticles to MORALs and Single-Atom Catalysts". Catalysts 10, nr 11 (19.11.2020): 1343. http://dx.doi.org/10.3390/catal10111343.

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Silver catalysis has a rich and versatile chemistry now expanding from processes mediated by silver complexes and silver nanoparticles to transformations catalyzed by silver metal organic alloys and single-atom catalysts. Focusing on selected recent advances, we identify the key advantages offered by these highly selective heterogeneous catalysts. We conclude by offering seven research and educational guidelines aimed at further progressing the field of new generation silver-based catalytic materials.

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Kirsebom, L. A. "RNase P RNA-mediated catalysis". Biochemical Society Transactions 30, nr 6 (1.11.2002): 1153–58. http://dx.doi.org/10.1042/bst0301153.

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The endoribonuclease RNase P is involved in the processing of tRNA precursors to generate mature 5′ termini. The catalytic activity of RNase P is associated with an RNA, RNase P RNA. A specific interaction between the 3′ end of the substrate and RNase P RNA, to form an RNase P RNA-substrate complex, is referred to as the ‘73–294-interaction’. This interaction has an important role for efficient and correct cleavage to occur. Here our understanding of the contribution of the 73–294-interaction and metal ions, with respect to efficient and correct cleavage in RNase P RNA-mediated catalysis, will be discussed.

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Mummadi, Suresh, i Clemens Krempner. "Triphenylborane in Metal-Free Catalysis". Molecules 28, nr 3 (31.01.2023): 1340. http://dx.doi.org/10.3390/molecules28031340.

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The development and application of new organoboron reagents as Lewis acids in synthesis and metal-free catalysis have dramatically expanded over the past 20 years. In this context, we will show the recent uses of the simple and relatively weak Lewis acid BPh3—discovered 100 years ago—as a metal-free catalyst for various organic transformations. The first part will highlight catalytic applications in polymer synthesis such as the copolymerization of epoxides with CO2, isocyanate, and organic anhydrides to various polycarbonate copolymers and controlled diblock copolymers as well as alternating polyurethanes. This is followed by a discussion of BPh3 as a Lewis acid component in the frustrated Lewis pair (FLP) mediated cleavage of hydrogen and hydrogenation catalysis. In addition, BPh3-catalyzed reductive N-methylations and C-methylations with CO2 and silane to value-added organic products will be covered as well along with BPh3-catalyzed cycloadditions and insertion reactions. Collectively, this mini-review showcases the underexplored potential of commercially available BPh3 in metal-free catalysis.

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Subramanian, Palaniappan, Dalila Meziane, Robert Wojcieszak, Franck Dumeignil, Rabah Boukherroub i Sabine Szunerits. "Plasmon-Induced Electrocatalysis with Multi-Component Nanostructures". Materials 12, nr 1 (24.12.2018): 43. http://dx.doi.org/10.3390/ma12010043.

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Noble metal nanostructures are exceptional light absorbing systems, in which electron–hole pairs can be formed and used as “hot” charge carriers for catalytic applications. The main goal of the emerging field of plasmon-induced catalysis is to design a novel way of finely tuning the activity and selectivity of heterogeneous catalysts. The designed strategies for the preparation of plasmonic nanomaterials for catalytic systems are highly crucial to achieve improvement in the performance of targeted catalytic reactions and processes. While there is a growing number of composite materials for photochemical processes-mediated by hot charge carriers, the reports on plasmon-enhanced electrochemical catalysis and their investigated reactions are still scarce. This review provides a brief overview of the current understanding of the charge flow within plasmon-enhanced electrochemically active nanostructures and their synthetic methods. It is intended to shed light on the recent progress achieved in the synthesis of multi-component nanostructures, in particular for the plasmon-mediated electrocatalysis of major fuel-forming and fuel cell reactions.

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Wang, Bing, Junjie Zhang, Yun Xue, Yuliang Chong, Dongdong Zhao, Hu Cheng, Liangliang Tian i Jinliang Zhuang. "Enhanced Catalytic Activity of TEMPO-Mediated Aerobic Oxidation of Alcohols via Redox-Active Metal–Organic Framework Nodes". Molecules 28, nr 2 (6.01.2023): 593. http://dx.doi.org/10.3390/molecules28020593.

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Metal–organic frameworks (MOFs) are outstanding platforms for heterogeneous catalysis due to their tunable pore size, huge surface area, large porosity, and potential active sites. The design and synthesis of MOF/organocatalyst co-catalytic systems have attracted considerable interest owing to their high catalytic activity, low toxicity, and mild reaction conditions. Herein, we reported the synthesis of a bifunctional TEMPO-IsoNTA organocatalyst featuring a pyridyl group as an anchoring site and a TEMPO radical as a catalytic active site. By using the topologically isomorphic structures of MIL-101(Fe) and MIL-101(Cr) as co-catalysts, these MOF/TEMPO-IsoNTA systems enable the efficient aerobic oxidation of various alcohols to their corresponding aldehydes or ketones under mild conditions. Notably, the MIL-101(Fe)/TEMPO-IsoNTA system exhibits superior catalytic activity, thanks to their redox-active FeIII-oxo nodes, which facilitate the regeneration of TEMPO-IsoNTA. Our research not only solves the problem of potential heavy metal contamination in the TEMPO-based homogeneous catalytic system, but also enriches the understanding of synergism of MOFs/organocatalysts.

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Welin, Eric R., Chip Le, Daniela M. Arias-Rotondo, James K. McCusker i David W. C. MacMillan. "Photosensitized, energy transfer-mediated organometallic catalysis through electronically excited nickel(II)". Science 355, nr 6323 (26.01.2017): 380–85. http://dx.doi.org/10.1126/science.aal2490.

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Transition metal catalysis has traditionally relied on organometallic complexes that can cycle through a series of ground-state oxidation levels to achieve a series of discrete yet fundamental fragment-coupling steps. The viability of excited-state organometallic catalysis via direct photoexcitation has been demonstrated. Although the utility of triplet sensitization by energy transfer has long been known as a powerful activation mode in organic photochemistry, it is surprising to recognize that photosensitization mechanisms to access excited-state organometallic catalysts have lagged far behind. Here, we demonstrate excited-state organometallic catalysis via such an activation pathway: Energy transfer from an iridium sensitizer produces an excited-state nickel complex that couples aryl halides with carboxylic acids. Detailed mechanistic studies confirm the role of photosensitization via energy transfer.

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Vanni, Matteo, Maria Caporali, Manuel Serrano-Ruiz i Maurizio Peruzzini. "Catalysis Mediated by 2D Black Phosphorus Either Pristine or Decorated with Transition Metals Species". Surfaces 3, nr 2 (1.04.2020): 132–67. http://dx.doi.org/10.3390/surfaces3020012.

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Among the novel class of mono-elemental two-dimensional (2D) materials, termed Xenes, phosphorene is emerging as a great promise for its peculiar chemical and physical properties. This review collects a selection of the recent breakthroughs that are related to the application of phosphorene in catalysis and electrocatalysis. Noteworthy, thanks to its intrinsic Lewis basic character, pristine phosphorene turned out to be more efficient and more selective than other non-metal catalysts, in chemical processes as the electroreduction of nitrogen to ammonia or the alkylation of nucleophiles with esters. Once functionalized with transition metals nanoparticles (Co, Ni, Pd, Pt, Ag, Au), its catalytic activity has been evaluated in several processes, mainly hydrogen and oxygen evolution reactions. Under visible light irradiation, it has shown a great improvement of the activity, demonstrating high potential as a photocatalyst.

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Rozprawy doktorskie na temat "Metal Mediated Catalysis"

Filippov, Igor 1971. "Metal-mediated hydrodenitrogenation catalysis: Designing new models". Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282749.

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Reduction of Ta(DIPP)₂Cl·OEt₂(DIPP= 2,6-OC₆H₃ⁱPr₂) with 2 equiv. of NaHg in the presence of 3,5-lutidine results in cyclometalation of DIPP to give TaCl(DIPP)-(OC₆H₃ⁱPr-η²(C,C)-CMe =CH₂)(3,5-lutidine)₂ (10) in moderate yield. Metallacycle 10 was also isolated from the reaction of (η⁶-C₆Me₆)Ta(DIPP)₂Cl with 3,5-lutidine. Examination of both crude reaction mixtures by ¹H NMR revealed 10 to be the major product without any indication of the formation of η²-lutidine species. These observations suggest that η²(N,C)-coordination of 3,5-lutidine is kinetically incompetitive with respect to the cyclometalation of DIPP by d² tantalum. Such undesired reactivity of DIPP can be potentially inhibited by the use of linked aryloxide ligands to prevent close approach of metalatable C-H bonds of DIPP to the metal center. An efficient route to a family of silane-linked aryloxides was developed. Tris(2-hydroxy-3-isopropylphenyl)methylsilane (H₃TIPSI, 59), bis(2-hydroxy-3-isopropyl-phenyl)diphenylsilane (H₂BIPSI, 61), and bis(2-hydroxy-3-isopropylphenyl)dimethyl-silane (H₂BIPSI, 60) were obtained via deprotection of the parent silane-linked anisoles. The anisoles were prepared in high yields by treating 2-methoxy-3-isopropyl-phenyllithium·0.5TMEDA (27·0.5TMEDA) with an appropriate amount of chloroalkylsilanes. The deprotection was carried out employing BBr₃ in CH₂Cl₂ followed by hydrolysis of the intermediate boron ethers in the presence of a non-nucleophilic base to avoid protiodesilylation. Additionally, a significantly improved synthesis of 1,2-bis(3-isopropyl-2-hydroxyphenyl)ethane (H₂BIPP, 40) employing 27·0.5TMEDA as a starting reagent is reported. 2-Methoxyphenyllithium 27·0.5TMEDA was prepared via catalytic ortho-directed metalation of 2-isopropylanisole, and the mechanistic aspects of such metalations are presented. Trinuclear complex (AlBr₂)₃TIPSI (55) was isolated from the reaction of Me₃TISPI with 3 equiv. of AlBr₃ in benzene at 60°C. Preliminary reactivity studies show that Me₃TIPSI (49) and Me₂BIPSI (51) can be reacted with TaBr₅ under similar conditions to give Br₃Ta(MeTIPSI)(THF)₂ (62) and Br₃Ta(BIPP)OEt₂ (63), respectively, after appropriate reaction work ups.

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Illesinghe, Jayamini P. M. "Synthesis and use of nitrogen heterocycles in metal mediated reactions". Monash University, School of Chemistry, 2004. http://arrow.monash.edu.au/hdl/1959.1/9637.

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Jiang, Quan. "Computational Studies of Catalysis Mediated by Transition Metal Complexes". Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505187/.

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Computational methods were employed to investigate catalytic processes. First, DFT calculations predicted the important geometry metrics of a copper–nitrene complex. MCSCF calculations supported the open-shell singlet state as the ground state of a monomeric copper nitrene, which was consistent with the diamagnetic character deduced from experimental observations. The calculations predicted an elusive terminal copper nitrene intermediate. Second, DFT methods were carried out to investigate the mechanism of C–F bond activation by a low-coordinate cobalt(I) complex. The computational models suggested that oxidative addition, which is very rare for 3d metals, was preferred. A π–adduct of PhF was predicted to be a plausible intermediate via calculations. Third, DFT calculations were performed to study ancillary ligand effects on C(sp3)–N bond forming reductive elimination from alkylpalladium(II) amido complexes with different phosphine supporting ligands. The dimerization study of alkylpalladium(II) amido complexes indicated an unique arrangement of dative and covalent Pd-N bonds within the core four-membered ring of bimetallic complexes. In conclusion, computational methods enrich the arsenal of methods available to study catalytic processes in conjunction with experiments.

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Ward, William, i William Ward. "Metal Ion-Mediated Folding and Catalysis of the Hammerhead Ribozyme". Thesis, University of Oregon, 2012. http://hdl.handle.net/1794/12375.

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The factors that determine RNA structure formation, stability, and dynamics are inexorably linked to RNA function. The Hammerhead ribozyme (HHRz) has long served as a model for studying metal-dependent folding and catalysis in RNA. The HHRz consists of three helices meeting at a common junction of conserved nucleotides that form the active site of the ribozyme. Current models of metal-dependent HHRz function involve a requirement for divalent metals to globally fold the ribozyme at low metal concentrations, followed by a second metal-dependent process which activates the HHRz for catalysis. The exact role of metal ions in activating HHRz catalysis is still a subject of investigation. We used 2-aminopurine substitutions near the active site of the ribozyme to determine if this second metal-dependent process involves a conformational rearrangement in the core of the ribozyme. We find evidence for a conformational change beyond global folding in the core of the ribozyme that not only correlates with metal activated catalysis but is also sensitive to the identity of the metal ions used for folding. Though phosphorothioate substitutions indicate that a ground-state coordination of a catalytic metal to the scissile phosphate is required for efficient catalysis, our folding studies show that this coordination event is not absolutely required for folding of the HHRz core. To investigate possible roles for metal ions in general acid-base catalysis, we tested the pH dependence of the HHRz rate using a variety of metal ions. We find the pH dependent rate profile of the ribozyme is shifted by transition metal ions, whereas other group II metals show similar profiles to Mg

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Stenton, Benjamin James. "Metal mediated mechanisms of drug release". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/284402.

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In this thesis will be described research towards the development of bioorthogonal bond-cleavage reactions, and their applications in targeted drug delivery (Figure 1). The first project relates to the development of a palladium mediated bond-cleavage or "decaging" reaction which can cause a propargyl carbamate to decompose and release an amine. This was further developed by the incorporation of a protein modification handle which allowed an amine-bearing drug to be covalently ligated to a protein by a palladium-cleavable linker. This chemistry was demonstrated by the conjugation of the anticancer drug doxorubicin to a tumour targeted anti-HER2 nanobody. The drug could then be delivered to cancer cells upon addition of a palladium complex. The second project relates to the development of a platinum mediated bond-cleavage reaction. This was developed with the aim of using platinum-containing anticancer drugs - such as cisplatin - as a catalyst to cause drug release reactions in tumours. In this reaction an alkyne-containing amide can decompose to release an amine upon addition of platinum complexes, and was applied to the release of prodrugs of the cytotoxins monomethylauristatin E and 5-fluorouracil in cancer cells. A cisplatin-cleavable antibody-drug conjugate was designed and synthesised, and progress towards its biological evaluation will be discussed.

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Clavadetscher, Jessica Veronica. "Transition metal catalysis : a new paradigm in bioorthogonal drug activation". Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/29580.

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Powerful tools have emerged in the past few years to allow the sensing, imaging and modulation of biological processes in living systems. Bioorthogonal organometallic reactions are transformations catalysed by transition metals, which are compatible within a biological environment. Palladium-mediated cross-coupling and decaging reactions, for example, have been successfully applied to catalyse non-natural chemical transformations within a biological milieu. Up until now, copper-catalysed cycloaddition reactions have been used extensively for the conjugation, immobilisation, and purification of biomolecules, but their further application in vivo has been limited by the inherent toxicity of copper. Herein, different transition metal catalysts were designed and applied in cellular and in vivo manipulations. Polymeric solid supports were functionalised with palladium nanoparticles and used as biocompatible, heterogeneous catalysts in selective decaging and cross-coupling reactions to activate fluorescent probes and synthesise cytotoxic anticancer drugs in situ. In order to gain tumour selectively, targeting functionalities were incorporated into the particles to allow the spatial control of the selective activation of labelling probes. The simultaneous synthesis of two different anticancer agents intracellularly, by two totally different mechanisms (in situ synthesis and decaging), is reported. The cellular toxicity of copper was addressed by entrapping copper nanoparticles on a polymeric solid support, allowing the activation of labelling probes, as well as the synthesis of an anticancer agent from two benign components through the well-known copper catalysed azide-alkyne cycloaddition. The biocompatibility of the copper catalysts in vivo was shown by implantation in zebrafish embryos.

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Kikovska, Ema. "Versatile and Antique World of RNA : The Simplicity of RNA Mediated Catalysis". Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7847.

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Neary, Stephen. "An investigation of thiadiazolidines and related compounds for use as ligands in metal mediated catalysis". Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/9122.

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This thesis describes the investigation of thiadiazolidine 1-oxides and structurally related compounds as ligands in palladium catalysis. The introduction will provide background information on subjects related to the work of the main project. Palladium catalysed cross couplings, namely the Heck and Tsuji-Trost reactions, will feature prominently and will be discussed in basic detail. A general outline of different classes of ligands used in palladium catalysis will also be put forward. Extraneous factors which affect catalyst reactivity will also be discussed, including the use of microwave irradiation and the effect of additives. Special attention is paid towards sulfur containing ligands. As their use has been relatively limited this will also include other areas of catalysis. Investigations into the synthesis of esermethole prompt a general background of methods of synthesising oxindoles and also examples of previous syntheses of the compound. The second chapter begins by describing the initial exploratory work, the testing of a thiadiazolidine 1-oxide compound as a ligand for the Heck reaction. Aryl iodides are successfully coupled to a range of styrenes and α,β-unsaturated esters in excellent yields under microwave conditions. Aryl bromides are also successfully coupled after some optimisation. In many cases the presence of tetrabutylammonium bromide is required to prevent shattering of the sealed microwave vial. A range of differently substituted thiadiazolidine 1-oxides were synthesised in order to establish a pattern of reactivity based on steric and electronic factors. Structurally related chiral compounds were also synthesised, including the first reported enantiomerically pure thiadiazol-3-one 1-oxide and thiatriaza-indene 3-oxide systems chiral at the sulfur atom. The synthesis of oxindoles using palladium mediated and non-catalytic chemistry was also investigated. Investigations into the synthesis of esermethole were undertaken; the key stereoinducing reaction, the decarboxylative asymmetric allyic alkylation reaction, achieved a 46% ee. A formal synthesis of esermethole was outlined in 8 steps from commercially available material. The third chapter is the experimental section and is dedicated to the methods of synthesis and characterization of the compounds mentioned in the previous chapter. X-ray reports regarding the crystallographic representation of the structures presented in chapter two are provided in appendix A.

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Liu, Cong. "Transition Metal Mediated C-o Bond Cleavage: From Co2 Activation to Lignin Degradation". Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc283790/.

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CO2 activation and conversion mediated by transition metal (TM) catalysts were investigated. Homogeneous catalysis of the reverse water gas shift reaction CO2+H2→H2O+CO was studied as a means to reduce CO2. β-diketiminato metal models L'MI ( L' =C3N2H5-; M = first-row TMs) were considered as potential catalysts. The thermodynamics of prototypical reaction pathways were simulated using B3LYP/aug-cc-pVTZ. Results show that middle series metal complexes result in more thermodynamically favorable properties; therefore, more detailed thermodynamic and kinetic studies were carried out for Mn, Fe, and Co complexes. On the other hand, heterogeneous catalysis of the reduction of CO2 to CO was carried out on Fe, Co, Ni, and Cu surfaces, using the PBE functional. Reaction barriers were calculated using the climbing image nudged elastic band method. Late 3d and 4d transition metal ion (Fe, Co, Ni, Cu, Ru, Rh, Pd, and Ag) mediated activation of dimethyl ether was studied to investigate the intrinsic catalytic properties of metals for C-O bond cleavage. A set of density functional theory (DFT) methods (BLYP, B3LYP, M06, M06-L, B97-1, B97-D, TPSS, and PBE) with aug-cc-pVTZ basis sets was calibrated with CCSD(T)/CBS calculations on reaction energies and barriers.

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Smith, Craig R. "Metal-Catalyzed Reactions of Ethene: Asymmetric Hydrovinylation and Palladacycle-Mediated Low Pressure Vinylation of Aryl and Vinyl Halides". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1274734379.

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Książki na temat "Metal Mediated Catalysis"

Estes, Deven Paul. Transition Metal Hydrides that Mediate Catalytic Hydrogen Atom Transfers. [New York, N.Y.?]: [publisher not identified], 2014.

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Tanaka, Ken. Transition-Metal-Mediated Aromatic Ring Construction. Wiley & Sons, Limited, John, 2013.

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Tanaka, Ken. Transition-Metal-Mediated Aromatic Ring Construction. Wiley & Sons, Incorporated, John, 2013.

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Tanaka, Ken. Transition-Metal-Mediated Aromatic Ring Construction. Wiley & Sons, Incorporated, John, 2013.

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Tanaka, Ken. Transition-Metal-Mediated Aromatic Ring Construction. Wiley & Sons, Incorporated, John, 2013.

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Tanaka, Ken. Transition-Metal-Mediated Aromatic Ring Construction. Wiley & Sons, Incorporated, John, 2013.

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Części książek na temat "Metal Mediated Catalysis"

Oar-Arteta, Lide, Tim Wezendonk, Xiaohui Sun, Freek Kapteijn i Jorge Gascon. "Metal-Organic Framework-Mediated Synthesis in Catalysis". W Nanotechnology in Catalysis, 225–50. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527699827.ch10.

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Solà, Miquel, Miquel Duran i Maricel Torrent. "The Dötz Reaction: A Chromium Fischer Carbene-Mediated Benzannulation Reaction". W Catalysis by Metal Complexes, 269–87. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47718-1_11.

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Nixon, Tracy D., i Jonathan M. J. Williams. "N-Heterocyclic Carbene Complexes in other Transition Metal Mediated Reactions". W Catalysis by Metal Complexes, 253–62. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2866-2_11.

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Zevaco, Thomas A., i Arjan W. Kleij. "Nonreductive Reactions of CO2 Mediated by Cobalt Catalysts: Cyclic and Polycarbonates". W Non-Noble Metal Catalysis, 529–47. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527699087.ch19.

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Codolá, Zoel, Julio Lloret-Fillol i Miquel Costas. "Catalytic Water Oxidation: Water Oxidation to O2 Mediated by 3d Transition Metal Complexes". W Non-Noble Metal Catalysis, 425–51. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527699087.ch16.

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Luzyanin, Konstantin V., i Maxim L. Kuznetsov. "Metal-Mediated [2+3] Dipolar Cycloaddition to Substrates with CN Triple Bond: Recent Advances". W Advances in Organometallic Chemistry and Catalysis, 171–83. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118742952.ch13.

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Pini, Dario, Antonella Petri, Alberto Mastantuono i Piero Salvadori. "Heterogeneous Enantioselective Hydrogenation and Dihydroxylation of Carbon Carbon Double Bond Mediated by Transition Metal Asymmetric Catalysts". W Chiral Reactions in Heterogeneous Catalysis, 155–76. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1909-6_18.

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Kretschmer, Robert, Maria Schlangen i Helmut Schwarz. "Mechanisms of Metal-Mediated C-N Coupling Processes: A Synergistic Relationship between Gas-Phase Experiments and Computational Chemistry". W Understanding Organometallic Reaction Mechanisms and Catalysis, 1–16. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527678211.ch1.

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Chemler, Sherry R. "Stereoselective Nitrogen Heterocycle Synthesis Mediated by Chiral Metal Catalysts". W Catalytic Methods in Asymmetric Synthesis, 671–88. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118087992.ch16.

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Sumerin, Victor, Konstantin Chernichenko, Felix Schulz, Markku Leskelä, Bernhard Rieger i Timo Repo. "Amine-Borane Mediated Metal-Free Hydrogen Activation and Catalytic Hydrogenation". W Topics in Current Chemistry, 111–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/128_2012_391.

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Raporty organizacyjne na temat "Metal Mediated Catalysis"

Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova i Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, styczeń 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.

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