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Showing 1 to 20 of 20 for “"Silanols"”.
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Palladium-Catalyzed Cross -Coupling of Aryl(dimethyl)silanols: Method Development and Mechanistic Analysis
Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Halfsandwich tungsten complexes with a silanol-functionalized cyclopentadienyl ligand : synthesis and reactivity
Within the studies concerning metallo-silanols, halfsandwich-tungsten complexes have been silanol-functionalized at the cyclopentadienyl ligand. The stability and the condensation behavior have been investigated. Thus, it was shown that these complexes are stable enough for isolation but they are …
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Development of organosilicon cross-coupling reaction
… This is a study for advancing the use of silanols and silanolate cross-coupling in modern organic chemistry
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Studies on Methylaluminoxane Catalyst Activators
… and by modification of MAO with long chain silanols. Addition of silanols led to polymers with lower . Differences in productivity, polymer molecular weight and number of active species were shown to be primarily a linear function of the TMA concentration. An important part of this PhD was …
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The synthesis of N-substituted ferrocenes and CH activation towards the synthesis of Organosilanols
… synthesis of planar-chiral ferrocene-based organosilanols was also described. High enantioselectivities and yields of up to 91 and 87%, respectively, have been achieved in collaboration with Frank Schmidt using both zinc and boron-based aryl sources. Although silanols gave lower yields and …
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Synthetic investigations of molybdenum pyrrolide and related complexes
… have been prepared through the addition of silanols to Mo(NR)(CHCMe 2Ph)(pyrrolyl) 2 species (R = 1 -adamantyl (Ad) or 2,6-i-Pr2C6H3 (Ar)). The silanols employed include (t-Bu)3SiOH (Hsilox), (i-Pr)3SiOH, (Me3Si)3SiOH, (t-Bu-0)3SiOH, Me2(t-Bu)SiOH, and Ph 3SiOH. The mono(silox) complex, …
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The behavior of water at the modified silica interface.
… surface region by interactions with the surface silanols and the curvature of the silica surface resulted in the observation of a melting peak was that was significantly different than the bulk water behavior. Changes to this peak were observed as a function of the modification of the silica …
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Functionalization of Metal Oxide Surfaces through Chemical Reactions and Physical Adsorption
… acidic centers, followed by the coupling of silanols to the surface to produce grafted siloxanes.</p> <p>We then explored Phthalocyanines (Pcs), an interesting class of catalytically active molecules with unique spectroscopic, photoelectric, and sometimes magnetic properties. This research …
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Zweifach Eisen-substituierte Silane, Silanole und Siloxane
… (X = H, Cl, OH) und des hetero-bismetallierten Silanols [Cp(OC)2Fe][Cp(OC)2PMe3]SiMe(OH). Dabei konnte lediglich [Cp(OC)2Fe]2SiH(OH) durch Hydrolyse des entsprechenden halogenierten Bis(ferrio)silans hergestellt werden. Alle anderen Bis(metallo)silanole wurden durch Oxygenierung der jeweiligen …
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Structure-property behavior of hybrid materials incorporating oligomeric species with inorganic silicates by a sol-gel process
… general reaction scheme was to first generate silanols from both components through the hydrolysis reaction, and then form the network structure by a co-condensation reaction with the silanol groups. The preparation of these hybrid materials was successful. Most of these hybrid materials were …
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Understanding Functional Silica Additives for HDPE Composite Materials
… silica, thus advancing the quantification of silanols in a novel approach. The type of functional group on the surface of the silica particle has a clear influence on the silanol density due to considerations of steric hindrance. TGA, differential scanning calorimetry (DSC), dynamic rheology, …
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Eisenfragment-substituierte Silanole, Silylamine und Heterosiloxane von Aluminium, Gallium und Indium
… 19. Die Umsetzung des Ferriomethyl-silanols Cp(OC)2Fe-CH2-SiMe2OH (20) mit den Trialkylverbindungen der Gruppe 13 (6b-e) liefert unter Alkaneliminierung glatt die Ferriomethyl-substituierten Heterosiloxane 21a-d. Die Aggregation zu Dimeren ist für 21b-d sowohl durch …
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Z-selective olefin metathesis processes and Cis/syndioselective ROMP with high oxidation state molybdenum alkylidenes
… compounds towards ligand displacement by surface silanols is reported, resulting in the synthesis of several new silicasupported tungsten alkylidynes. The alkyne metathesis activity of all new homogeneous and heterogeneous alkylidyne complexes is reported. Chapter 2: Addition of one equivalent of …
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FREE-BASE PORPHYRIN FOR CO2 ACTIVATION
… it is easy to functionalize and the presence of silanols group onto its surface foster the reactivity of epoxides towards CO2. The so-prepared catalyst, in combination with tetrabutyl ammonium iodide (TBAI) resulted very active in the preparation of cyclic carbonates from the reaction of epoxides …
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Fabrication of surface amine gradients by controlled-rate infusion for chromatographic applications
… and correlated to their reactivity with surface silanols. Among those aminoalkoxysilanes, ethylenediamine and diethlenetriamine were found to be very good chelating agents to bind with metal ions. Thus, gradients prepared with diamine and triamine were used as ligand density gradients for the …
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Hybrid organic/inorganic nanotubes of imogolite type
… that with IMO-500, hydroxyls more acidic than silanols are formed. On the contrary, with lamellar Me-IMO and Me-IMO-NH2, physisorbed CO as well as heterogeneous acidic sites are found, analogously to Al-rich microporous silicates. Finally, in spite of their shared fibrous nature, according to …
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Ferriomethyl- und Wolframiomethyl-substituierte Silane, Silanole und Siloxane
Das Interesse an Übergangsmetall-substituierten Siloxanen ist in den vergangenen Jahren stark angewachsen. Dies ist vor allem darauf zurückzuführen, dass diesen Systemen eine wichtige Modellfunktion für auf Silica-Oberflächen verankerte, katalytisch aktive Übergangsmetallkomplexe zukommt, die eine …
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Analysis of organosilicone surfactants and their degradation products
… more stable as low condensation polymers and silanols, and short EO chains more commonly observed in cyclic products. The GC/MS analysis of the heptane-soluble fraction of acid-degraded Silwet L-77 enabled the tentative assignment of the cyclic trimer, 27 [R¹, R², R³ = -C₃- OH] product. ¹H and …