"The Synthesis of Phenols and Quinones Via Fischer Carbene
... complex (E)-4.43 This report is controversial44 because it is inconsistent with kinetic studies that demonstrated that the first step of the reaction is loss of CO, and that the second step depends on the alkyne concentration.42 The η1 ,η3 -vinyl carbene-complexed intermediate (E)-4 has been suggest ...
... complex (E)-4.43 This report is controversial44 because it is inconsistent with kinetic studies that demonstrated that the first step of the reaction is loss of CO, and that the second step depends on the alkyne concentration.42 The η1 ,η3 -vinyl carbene-complexed intermediate (E)-4 has been suggest ...
Chemistry of Chromium - Chemwiki
... with metal - metal. Chromium uses terphenyl ligand to perform this action, thus making it relatively weak, but stable up to 200°C. A quintuple bond is only possible if chromium atom has only one other ligand in order to keep the bond stable. Although the discovery is fairly recent, it has already pr ...
... with metal - metal. Chromium uses terphenyl ligand to perform this action, thus making it relatively weak, but stable up to 200°C. A quintuple bond is only possible if chromium atom has only one other ligand in order to keep the bond stable. Although the discovery is fairly recent, it has already pr ...
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... Over the course of my graduate career I have no doubt that you worked not only to make me a better student and chemist, but also as an individual. I will always appreciate the gu ...
... Over the course of my graduate career I have no doubt that you worked not only to make me a better student and chemist, but also as an individual. I will always appreciate the gu ...
Synthesis of DiamidoPyrrolyl Molybdenum Complexes Relevant to Reduction DOI: 10.1021/ic100856n
... (i) MacKay, B. A.; Fryzuk, M. D. Chem. Rev. 2004, 104, 385. (j) Gambarotta, S.; Scott, J. Angew. Chem., Int. Ed. 2004, 43, 5298. (k) Hidai, M.; Mizobe, Y. Can. J. Chem. ...
... (i) MacKay, B. A.; Fryzuk, M. D. Chem. Rev. 2004, 104, 385. (j) Gambarotta, S.; Scott, J. Angew. Chem., Int. Ed. 2004, 43, 5298. (k) Hidai, M.; Mizobe, Y. Can. J. Chem. ...
Full text (no figures)
... Binary and ternary metal aluminum oxides are technologically important classes of materials with applications in ceramics, optics, electronics, lasers and catalysis. MgAl.sub.2 O.sub.4 (spinel) can be hot pressed into transparent windows with an exceptional infrared transmission range. MgAl.sub.2 O. ...
... Binary and ternary metal aluminum oxides are technologically important classes of materials with applications in ceramics, optics, electronics, lasers and catalysis. MgAl.sub.2 O.sub.4 (spinel) can be hot pressed into transparent windows with an exceptional infrared transmission range. MgAl.sub.2 O. ...
Chapter 1 INTRODUCTION
... Anionic clays can be synthesized in many ways. Most commonly used method is the direct precipitation method. This method involves nucleating and growing the metal hydroxide layer by mixing an aqueous solution containing the salts of two metal ions, in the presence of the desired anion and a base. An ...
... Anionic clays can be synthesized in many ways. Most commonly used method is the direct precipitation method. This method involves nucleating and growing the metal hydroxide layer by mixing an aqueous solution containing the salts of two metal ions, in the presence of the desired anion and a base. An ...
STUDIES ON TRANSITION METAL NITROSYL CHEMISTRY by
... c h l o r i d e , bromide and i o d i d e , (PPh ) NX (X = C l , Br or I) Preparation of bis(triphenylphosphine)iminium pentacarbonylhalotungstates, (PPh-) NW(CO)r-X (X = C l , Br or I) f.t ...
... c h l o r i d e , bromide and i o d i d e , (PPh ) NX (X = C l , Br or I) Preparation of bis(triphenylphosphine)iminium pentacarbonylhalotungstates, (PPh-) NW(CO)r-X (X = C l , Br or I) f.t ...
mechanistic investigations of transition metal catalyzed reactions
... plastic industry, have benefited from this development. The evolution of different transition metal catalysts has also been very important for the pharmaceutical industry. One vital factor when developing new and more effective catalysts is to obtain mechanistic insights. In this thesis, several dif ...
... plastic industry, have benefited from this development. The evolution of different transition metal catalysts has also been very important for the pharmaceutical industry. One vital factor when developing new and more effective catalysts is to obtain mechanistic insights. In this thesis, several dif ...
azu_etd_10412_sip1_m
... maintain operation at these conditions, but the capital costs for such equipment needs to be considered. Additionally, scCO2 is a nonpolar solvent. This translates into high solubilities of many light-weight organic chemicals, but low dissolution rates of polar species. However, small amounts of cos ...
... maintain operation at these conditions, but the capital costs for such equipment needs to be considered. Additionally, scCO2 is a nonpolar solvent. This translates into high solubilities of many light-weight organic chemicals, but low dissolution rates of polar species. However, small amounts of cos ...
cobalt(iii) complexes / cobalt(ii) cyanide 239
... Monoxide). It also is used as a catalyst for hydrogenation, isomerization, hydrosilation and polymerization reactions. The compound is also a source of producing pure cobalt metal and its purified salts. Physical Properties Orange crystals; density 1.78 g/cm3; melts at 5l°C; decomposes above this te ...
... Monoxide). It also is used as a catalyst for hydrogenation, isomerization, hydrosilation and polymerization reactions. The compound is also a source of producing pure cobalt metal and its purified salts. Physical Properties Orange crystals; density 1.78 g/cm3; melts at 5l°C; decomposes above this te ...
Slide 1
... Mn O where the anionic ligand is coordinated and "inserting" into OC the anionic ligand-metal bond to C CH3 generate the new anionic O ligand. An empty coordination site is left behind from where Mn(+1) the neutral ligand originally was 16elocated. ...
... Mn O where the anionic ligand is coordinated and "inserting" into OC the anionic ligand-metal bond to C CH3 generate the new anionic O ligand. An empty coordination site is left behind from where Mn(+1) the neutral ligand originally was 16elocated. ...
Transition metal-catalysed hydrogen transfer processes for C C and C N
... This thesis focusses on synthetic studies and mechanistic investigations of reactions involving hydrogen-transfer processes. In the first part, the development of an efficient method for the synthesis of -hydroxy ketones (aldols) and -amino ketones (Mannich products) from allylic alcohols and al ...
... This thesis focusses on synthetic studies and mechanistic investigations of reactions involving hydrogen-transfer processes. In the first part, the development of an efficient method for the synthesis of -hydroxy ketones (aldols) and -amino ketones (Mannich products) from allylic alcohols and al ...
pp-03-25-new dots.qxd
... The above reaction is reversible above 1,850°C. The metal produced as vapor must be cooled rapidly to prevent any reversible reactions. Rapid cooling (shock cooling) can quench the reaction giving finely divided pyrophoric dust ...
... The above reaction is reversible above 1,850°C. The metal produced as vapor must be cooled rapidly to prevent any reversible reactions. Rapid cooling (shock cooling) can quench the reaction giving finely divided pyrophoric dust ...
![Efficient Nickel-Catalyzed [2 + 2 + 2] Cycloaddition of CO2 and Diynes](http://s1.studyres.com/store/data/020170699_1-57fd7d519966a23e70b2c51c843f4c6e-300x300.png)
Efficient Nickel-Catalyzed [2 + 2 + 2] Cycloaddition of CO2 and Diynes
... reaction tolerated both acid- and base-sensitive functional groups such as esters, ethers, and siloxanes, and a variety fused five- and six-membered rings were prepared. In addition, the unsubstituted diyne (e.g., 9) afforded the corresponding pyrone (18) in good yield. All attempts to decrease the ...
... reaction tolerated both acid- and base-sensitive functional groups such as esters, ethers, and siloxanes, and a variety fused five- and six-membered rings were prepared. In addition, the unsubstituted diyne (e.g., 9) afforded the corresponding pyrone (18) in good yield. All attempts to decrease the ...
Molecular structure–reactivity relationships for the oxidation of sulfur
... Sulfuric acid is the largest volume chemical currently produced in the world, ≈95 billion pounds per year [2], and is manufactured by the contact process, which involves the high temperature catalytic oxidation of sulfur dioxide to sulfur trioxide over a unique supported liquid phase catalyst (silic ...
... Sulfuric acid is the largest volume chemical currently produced in the world, ≈95 billion pounds per year [2], and is manufactured by the contact process, which involves the high temperature catalytic oxidation of sulfur dioxide to sulfur trioxide over a unique supported liquid phase catalyst (silic ...
High Temperature Corrosion of Stainless Steels in Low Oxygen
... fuels in the transportation sector, the utilization of biogas from the thermal gasification of biomass and waste is a key issue. In general, the term gasification refers to a chemical process in which any carbonaceous fuel is converted to a gaseous fuel [1]. Compared to combustion, the available oxy ...
... fuels in the transportation sector, the utilization of biogas from the thermal gasification of biomass and waste is a key issue. In general, the term gasification refers to a chemical process in which any carbonaceous fuel is converted to a gaseous fuel [1]. Compared to combustion, the available oxy ...
Wet thermal oxidation of GaAs and GaN 6
... crystals of Ga2O3 are available (Tomm et al., 2000; V´llora et al., 2004) as well. Thermal oxidation of AIIIBV and AIIIN compounds – dry (Wilmsen, 1985; Lin et al., 2000) or wet (Readinger et al., 1999) – is unfortunately not similar to silicon oxidation. It is caused by other structure – these com ...
... crystals of Ga2O3 are available (Tomm et al., 2000; V´llora et al., 2004) as well. Thermal oxidation of AIIIBV and AIIIN compounds – dry (Wilmsen, 1985; Lin et al., 2000) or wet (Readinger et al., 1999) – is unfortunately not similar to silicon oxidation. It is caused by other structure – these com ...
The Oxide Fluoride Chemistry of Bromine, Selenium and Sulphur
... oxidation state of an element. As one descends a group, the electronegativity of the neutral element decreases. However, as the oxidation state of an element increases, shielding of the nuclear charge becomes less effective and the element becomes less polarisiable or more electronegative. As a cons ...
... oxidation state of an element. As one descends a group, the electronegativity of the neutral element decreases. However, as the oxidation state of an element increases, shielding of the nuclear charge becomes less effective and the element becomes less polarisiable or more electronegative. As a cons ...
Electroless Deposition of Copper
... Electroless copper deposition is affected by the pH in two distinct ways. First, OH ions are reactants in the overall reaction (17.1) and the partial anodic reaction (17.7) and thus influence these reactions in a direct way (primary pH effects). Second, pH affects various phenomena associated with ...
... Electroless copper deposition is affected by the pH in two distinct ways. First, OH ions are reactants in the overall reaction (17.1) and the partial anodic reaction (17.7) and thus influence these reactions in a direct way (primary pH effects). Second, pH affects various phenomena associated with ...
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 ...
Paving the Way to The Integration of Smart Nanostructures:
... compact passivating phase oxide layer . Under conventional steady state anodization conditions such layers are usually of limited thickness as the activation energy for atom or ion migration in the compact film is generally quite large. However there are some exceptions, e.g. molybdenum has been sho ...
... compact passivating phase oxide layer . Under conventional steady state anodization conditions such layers are usually of limited thickness as the activation energy for atom or ion migration in the compact film is generally quite large. However there are some exceptions, e.g. molybdenum has been sho ...
Inorganic Chemistry 2 (033021) - Inorganic Reaction
... This question comes from Shriver and Atkins, who give the answer: Ir(III) < Rh(III) < Co(III) < Ni(II) < Mn(II). Mn(II) is d5 and high spin, so no CFSE. Ni(II) is d8 and there is a large loss of CFSE on going to any 5 coordinate geometry, so there is a significant CFAE. The other 3 are all d6 low sp ...
... This question comes from Shriver and Atkins, who give the answer: Ir(III) < Rh(III) < Co(III) < Ni(II) < Mn(II). Mn(II) is d5 and high spin, so no CFSE. Ni(II) is d8 and there is a large loss of CFSE on going to any 5 coordinate geometry, so there is a significant CFAE. The other 3 are all d6 low sp ...
ORTHOMAGMATIC Fe–Ti–V OXIDE MINERALIZATION HOSTED IN
... divided into four modes of occurrence, based on field observations: 1) massive to semi-massive oxide pods, 2) disseminated oxide mineralization, 3) vein-like oxide mineralization, and 4) alternating bands of oxides and anorthosite. The oxide mineralogy is dominated by spinel series Fe–Ti oxide (magn ...
... divided into four modes of occurrence, based on field observations: 1) massive to semi-massive oxide pods, 2) disseminated oxide mineralization, 3) vein-like oxide mineralization, and 4) alternating bands of oxides and anorthosite. The oxide mineralogy is dominated by spinel series Fe–Ti oxide (magn ...
Enolate Chemistry - Institut für Organische Chemie
... stereospecific; thus if we can access either enolate geometry at will it should be possible to control the stereochemistry in the aldol products. This is crucial for stereoselective synthesis. ...
... stereospecific; thus if we can access either enolate geometry at will it should be possible to control the stereochemistry in the aldol products. This is crucial for stereoselective synthesis. ...
... Chemists of the first half of the nineteenth century were engaged in an attempt to classify the known substances. Chemistry was carried out exclusively on the macroscopic level and because little was known of basic structure, all of the information was discussed in macroscopic terms. Classification ...
Thermite
Thermite is a pyrotechnic composition of metal powder fuel and metal oxide. When ignited by heat, thermite undergoes an exothermic reduction-oxidation (redox) reaction. Most varieties are not explosive but can create brief bursts of high temperature in a small area. Its form of action is similar to that of other fuel-oxidizer mixtures, such as black powder.Thermites have diverse compositions. Fuels include aluminium, magnesium, titanium, zinc, silicon, and boron. Aluminium is common because of its high boiling point and low cost. Oxidizers include bismuth(III) oxide, boron(III) oxide, silicon(IV) oxide, chromium(III) oxide, manganese(IV) oxide, iron(III) oxide, iron(II,III) oxide, copper(II) oxide, and lead(II,IV) oxide.The reaction is used for thermite welding, often used to join rail tracks. Thermites have also been used in metal refining, demolition of munitions, and in incendiary weapons. Some thermite-like mixtures are used as pyrotechnic initiators in fireworks.