acez and Interfaces - Utrecht University Repository
... A common way of classifying oxides is based on their ----acid-base properties. Metal oxides can then be classified as acidic (e.g., Cr03 and V205), basic (e.g., La203), or amphoteric (e.g., ZnO). In this respect, it is important to know that acidity mostly increases with increasing oxidation state o ...
... A common way of classifying oxides is based on their ----acid-base properties. Metal oxides can then be classified as acidic (e.g., Cr03 and V205), basic (e.g., La203), or amphoteric (e.g., ZnO). In this respect, it is important to know that acidity mostly increases with increasing oxidation state o ...
Document
... Several derivatives of carboxylic acids, i.e., acid chlorides, esters, and nitriles are more easily reduced than the parent carboxylic acid. These can be reduced to aldehydes with 1 equivalent of a milder reducing agent, which will not further reduce the aldehyde to a 1 alcohol. A suitable, ‘mild’ ...
... Several derivatives of carboxylic acids, i.e., acid chlorides, esters, and nitriles are more easily reduced than the parent carboxylic acid. These can be reduced to aldehydes with 1 equivalent of a milder reducing agent, which will not further reduce the aldehyde to a 1 alcohol. A suitable, ‘mild’ ...
1 Introduction
... Apart from accelerating reactions, catalysts have another important property: they can influence the selectivity of chemical reactions. This means that completely different products can be obtained from a given starting material by using different catalyst systems. Industrially, this targeted reacti ...
... Apart from accelerating reactions, catalysts have another important property: they can influence the selectivity of chemical reactions. This means that completely different products can be obtained from a given starting material by using different catalyst systems. Industrially, this targeted reacti ...
Vanadium complexes containing amido functionalized
... Since the initial reports of the use of Cp-amido ligands on the group 3 metal scandium,1 most research has focused on the use of this type of ligand in catalytic olefin polymerization by group 4 metal complexes (Cp-amido)MCl2.2,3 Despite numerous reported ligand variations and their influence on the ...
... Since the initial reports of the use of Cp-amido ligands on the group 3 metal scandium,1 most research has focused on the use of this type of ligand in catalytic olefin polymerization by group 4 metal complexes (Cp-amido)MCl2.2,3 Despite numerous reported ligand variations and their influence on the ...
Organic Chemistry
... Organic chemistry looks at “oxidation” differently than we discussed in redox reactions where “oxidation” was all about losing electrons. In Organic Chemistry, “oxidation” is all about gaining OXYGEN! The more oxygen attached to the carbon, the more “oxidized” the carbon is considered. ...
... Organic chemistry looks at “oxidation” differently than we discussed in redox reactions where “oxidation” was all about losing electrons. In Organic Chemistry, “oxidation” is all about gaining OXYGEN! The more oxygen attached to the carbon, the more “oxidized” the carbon is considered. ...
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... complexes. Without a heteroatom directly bonded to the carbene carbon atom, the compounds are called metal-alkylidene complexes. The first stable transition metal carbene complex was synthesized and characterized by Fischer and Maasb61 in 19643 . Since then different synthetic routes have been devel ...
... complexes. Without a heteroatom directly bonded to the carbene carbon atom, the compounds are called metal-alkylidene complexes. The first stable transition metal carbene complex was synthesized and characterized by Fischer and Maasb61 in 19643 . Since then different synthetic routes have been devel ...
Ylide Ligands - DIGITAL.CSIC, el repositorio institucional
... principle, a singlet carbene and the nucleophile ZnE. Therefore, it is not surprising that the reaction bewteen a carbene and the corresponding nucleophile (R3P, R3N, R2S, etc) gives cleanly the expected ylide (method d) [2,3,4,9]. The carbene is usually stabilized as a diazo derivative. This method ...
... principle, a singlet carbene and the nucleophile ZnE. Therefore, it is not surprising that the reaction bewteen a carbene and the corresponding nucleophile (R3P, R3N, R2S, etc) gives cleanly the expected ylide (method d) [2,3,4,9]. The carbene is usually stabilized as a diazo derivative. This method ...
Methods to detect and characterize metal ion binding sites in
... cofactors for nucleic acids in vivo. This view might actually be oversimplified. For example, two different hammerhead ribozymes were examined towards their catalytic activity in the presence of various divalent metal ions [1,2]. In both cases, strong increases in cleavage rate were observed when su ...
... cofactors for nucleic acids in vivo. This view might actually be oversimplified. For example, two different hammerhead ribozymes were examined towards their catalytic activity in the presence of various divalent metal ions [1,2]. In both cases, strong increases in cleavage rate were observed when su ...
Chapter 19. Aldehydes and Ketones
... C–C bond next to C=O is broken to give carboxylic acids Reaction is practical for cleaving symmetrical ketones ...
... C–C bond next to C=O is broken to give carboxylic acids Reaction is practical for cleaving symmetrical ketones ...
Synthesis and Characterization of Bis-Phosphine
... If the ligand employed in the compound is polydentate and cyclic in nature, the complex is referred to as a macrocycle. Macrocyclic complexes exhibit not only enhanced stability due to the formation of multiple chelate rings, but also metal selectivity based upon cavity size when compared to chelate ...
... If the ligand employed in the compound is polydentate and cyclic in nature, the complex is referred to as a macrocycle. Macrocyclic complexes exhibit not only enhanced stability due to the formation of multiple chelate rings, but also metal selectivity based upon cavity size when compared to chelate ...
HYBRID MULTIDENTATE PHOSPHINE
... study. Single crystal X-ray analysis has been conducted at suitable junctures within the project. A surprising finding was that some solution-state structures were found to be different when studied in the solid state. The AuI complexes-containing the ligands have been successfully used in 1,5-enyne ...
... study. Single crystal X-ray analysis has been conducted at suitable junctures within the project. A surprising finding was that some solution-state structures were found to be different when studied in the solid state. The AuI complexes-containing the ligands have been successfully used in 1,5-enyne ...
Dihalogeno(diphosphane)metal(II) complexes (metal Co, Ni, Pd) as
... Dihalogenometal() complexes with bidentate phosphane ligands of the general type [M{Ph2P(CH2)nPPh2}X2] with n = 2 to 5, X = Cl or Br and M = Co, Ni or Pd have been utilized as catalysts for the vinyl/addition polymerization of norbornene. These complexes can be activated with the Lewis-acids methy ...
... Dihalogenometal() complexes with bidentate phosphane ligands of the general type [M{Ph2P(CH2)nPPh2}X2] with n = 2 to 5, X = Cl or Br and M = Co, Ni or Pd have been utilized as catalysts for the vinyl/addition polymerization of norbornene. These complexes can be activated with the Lewis-acids methy ...
Metal ion binding to iron oxides - Wageningen UR E
... made to simulate the experimental database assembled. In the first part we will refer mostly to assumptions made on the oxides structure, the specific surface areas of the major crystallographic planes ([1 1 0], [0 2 1]) and to parameters like proton affinities, capacitance of the different layers, and i ...
... made to simulate the experimental database assembled. In the first part we will refer mostly to assumptions made on the oxides structure, the specific surface areas of the major crystallographic planes ([1 1 0], [0 2 1]) and to parameters like proton affinities, capacitance of the different layers, and i ...
Heck Reaction
... are the most active homogeneous hydrogenation catalysts developed thus far. Use of weakly coordinating solvents provides the olefin substrate with relatively free access to the metal's reactive site. These cationic catalysts are also remarkably selective.... ...
... are the most active homogeneous hydrogenation catalysts developed thus far. Use of weakly coordinating solvents provides the olefin substrate with relatively free access to the metal's reactive site. These cationic catalysts are also remarkably selective.... ...
Full text - SG
... opposite charges, the electrostatic interaction is attractive (Eionic < 0) in the [ML(X)] complexes. Molecular orbital (MO) compositions and the overlap populations between molecular fragments were calculated using the AOMix program.37,38 Atomic charges and spin densities were calculated using the M ...
... opposite charges, the electrostatic interaction is attractive (Eionic < 0) in the [ML(X)] complexes. Molecular orbital (MO) compositions and the overlap populations between molecular fragments were calculated using the AOMix program.37,38 Atomic charges and spin densities were calculated using the M ...
Complexes. X-ray Structure of Rh1[C6H,(CH2NMe2),-o ,o`
... rhodium(1) complexes were performed under an atmosphere of analogous rhodium(1) and iridium(1) species having aryl dry nitrogen using Schlenk techniques. Solvents were carefully ligands that are either mono- or bis-ortho-chelated by dried and distilled prior to use. Reactions were carried out a t ni ...
... rhodium(1) complexes were performed under an atmosphere of analogous rhodium(1) and iridium(1) species having aryl dry nitrogen using Schlenk techniques. Solvents were carefully ligands that are either mono- or bis-ortho-chelated by dried and distilled prior to use. Reactions were carried out a t ni ...
Ion-exchange separation of metals by a single
... B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on behalf of the Commission" includes any employee or contractor of the Commission to the exte ...
... B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on behalf of the Commission" includes any employee or contractor of the Commission to the exte ...
Alcohols and Thiols
... The alcoholic proton is also somewhat acidic. The pKa for alcohols runs between 15 and 18 - certainly more acidic than your average alkyne! The general trend in acidity is 1°>2°>3°, with t-butanol being about the least acidic alcohol you’ll find...this is why t-butoxide is used as a base in many of ...
... The alcoholic proton is also somewhat acidic. The pKa for alcohols runs between 15 and 18 - certainly more acidic than your average alkyne! The general trend in acidity is 1°>2°>3°, with t-butanol being about the least acidic alcohol you’ll find...this is why t-butoxide is used as a base in many of ...
Unsaturated Molecules Containing Main Group Metals
... sistent with the electronegativities of the elements M and N.[25'The donor-acceptor bond shown by an arrow in 16b should differ appreciably in length from the N-M single bond; this is indeed the case for dimeric 14b,["] but not for dimeric l2c.[''l Finally, there are formulations such as 16c with io ...
... sistent with the electronegativities of the elements M and N.[25'The donor-acceptor bond shown by an arrow in 16b should differ appreciably in length from the N-M single bond; this is indeed the case for dimeric 14b,["] but not for dimeric l2c.[''l Finally, there are formulations such as 16c with io ...
Metal–ligand multiple bonds as frustrated Lewis - Beilstein
... Species containing Mδ+═Eδ− moieties have been known for some time, with the clearest examples being terminal imido and alkylidene complexes of early metals in their highest oxidation states. Such complexes may have substantial nucleophilic character at the multiply bonded group E [15,16,26], leading ...
... Species containing Mδ+═Eδ− moieties have been known for some time, with the clearest examples being terminal imido and alkylidene complexes of early metals in their highest oxidation states. Such complexes may have substantial nucleophilic character at the multiply bonded group E [15,16,26], leading ...
Preparation of Cu Nanoclusters within Dendrimer Templates
... intradendrimer Cu clusters. Evidence for this comes from the immediate change in solution color from blue to golden brown: the absorbance bands originally present at 605 and 300 nm disappear and are replaced with a monotonically increasing spectrum of nearly exponential slope toward shorter waveleng ...
... intradendrimer Cu clusters. Evidence for this comes from the immediate change in solution color from blue to golden brown: the absorbance bands originally present at 605 and 300 nm disappear and are replaced with a monotonically increasing spectrum of nearly exponential slope toward shorter waveleng ...
Metal carbonyl
Metal carbonyls are coordination complexes of transition metals with carbon monoxide ligands. Metal carbonyls are useful in organic synthesis and as catalysts or catalyst precursors in homogeneous catalysis, such as hydroformylation and Reppe chemistry. In the Mond process, nickel carbonyl is used to produce pure nickel. In organometallic chemistry, metal carbonyls serve as precursors for the preparation of other organometalic complexes.Metal carbonyls are toxic by skin contact, inhalation or ingestion, in part because of their ability to carbonylate hemoglobin to give carboxyhemoglobin, which prevents the binding of O2.