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Kinetics of the Alkylation and Acylation of Nickel Dipivaloyimethide

Description: Abstract: A study was made of the reactions of nickel dipivaloyimethide with the following reagents: tirphenylmethyl chloride, benzoyl chloride, [rho]-chloro and [rho]-methyl benzoyl chloride. Infrared spectra of the easily hydrolyzed product of tritylation seem to indicate that enol ether, the product of O-alkylation, is formed. the acyl halides reactor to give the triketones. the latter have been characterized by spectra and C, H, analysis. the kinetics of all the reactions studied were … more
Date: July 1959
Creator: Johnson, Kenneth Eugene & Hammond, George Simms, 1921-2005
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Reactions of Anions of Cyclic Oximes, Oxime Ethers, and Chiral Imines

Description: The purpose of this investigation is to examine reactions of anions of oximes, oxime ethers and imines with acylating agents and other electrophiles. It is also an attempt to utilize the phenomenon of geometrical enantiomeric isomerism, in which absolute configuration is determined by double bond geometry, and the concept of regiospecific anion formation, also determined by double bond geometry, for stereospecific synthesis of tropinone derivatives.
Date: August 1980
Creator: Maloney, John R.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Raman Scattering Sensor for Control of the Acid Alkylation Process in Gasoline Production

Description: Gasoline refineries utilize a process called acid alkylation to increase the octane rating of blended gasoline, and this is the single most expensive process in the refinery. For process efficiency and safety reasons, the sulfuric acid can only be used while it is in the concentration range of 98 to 86 %. The conventional technique to monitor the acid concentration is time consuming and is typically conducted only a few times per day. This results in running higher acid concentrations than they… more
Date: April 19, 2006
Creator: Uibel, Rory, H.; Smith, Lee M. & Benner, Robert, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Asymmetric Synthesis of (-)-Incarvillateine Employing an Intramolecular Alkylation via Rh-Catalyzed Olefinic C-H Bond Activation

Description: An asymmetric total synthesis of (-)-incarvillateine, a natural product having potent analgesic properties, has been achieved in 11 steps and 15.4% overall yield. The key step is a rhodium-catalyzed intramolecular alkylation of an olefinic C-H bond to set two stereocenters. Additionally, this transformation produces an exocyclic, tetrasubstituted alkene through which the bicyclic piperidine moiety can readily be accessed.
Date: February 18, 2008
Creator: Tsai, Andy; Bergman, Robert & Ellman, Jonathan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Asymmetric Intramolecular Alkylation of Chiral Aromatic Imines via Catalytic C-H Bond Activation

Description: The asymmetric intramolecular alkylation of chiral aromatic aldimines, in which differentially substituted alkenes are tethered meta to the imine, was investigated. High enantioselectivities were obtained for imines prepared from aminoindane derivatives, which function as directing groups for the rhodium-catalyzed C-H bond activation. Initial demonstration of catalytic asymmetric intramolecular alkylation also was achieved by employing a sterically hindered achiral imine substrate and catalytic… more
Date: April 16, 2007
Creator: Watzke, Anja; Wilson, Rebecca; O'Malley, Steven; Bergman, Robert & Ellman, Jonathan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mercury-Sensitized Photochemical Action on a Mixture of Isobutane and Isobutene

Description: This study investigated mercury-sensitized photochemical action on a mixture of isobutane and isobutene. Flow runs of isobutane-isobutene 3.2.1 mercury-saturated gases illuminated with unfiltered radiation of mercury vapor lamp gave no detectable change to hydrocarbons heavier than C4 at reaction tempratures of 27C. and 99C.
Date: June 1939
Creator: Gary, Felice
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Advances in Process Intensification through Multifunctional Reactor Engineering

Description: This project was designed to advance the art of process intensification leading to a new generation of multifunctional chemical reactors utilizing pulse flow. Experimental testing was performed in order to fully characterize the hydrodynamic operating regimes associated with pulse flow for implementation in commercial applications. Sandia National Laboratories (SNL) operated a pilot-scale multifunctional reactor experiment for operation with and investigation of pulse flow operation. Validation… more
Date: June 27, 2011
Creator: Timothy O’Hern, Lindsey Evans, Jim Miller, Marcia Cooper, John Torczynski, Donovan Pena, and Walt Gill, SNL, Will Groten, Arvids Judzis, Richard Foley, Larry Smith, and Will Cross, CR&L / CDTECH & T. Vogt, Lummus Technology / CDTECH.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advances in Process Intensification through Multifunctional Reactor Engineering

Description: This project was designed to advance the art of process intensification leading to a new generation of multifunctional chemical reactors utilizing pulse flow. Experimental testing was performed in order to fully characterize the hydrodynamic operating regimes associated with pulse flow for implementation in commercial applications. Sandia National Laboratories (SNL) operated a pilot-scale multifunctional reactor experiment for operation with and investigation of pulse flow operation. Validation… more
Date: February 1, 2011
Creator: O’Hern, Timothy; Evans, Lindsey; Miller, Jim; Cooper, Marcia; Torczynski, John; Pena, Donovan et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Versatile assembly of p-carboxylatocalix[4]arene-O-alkyl ethers

Description: Crystallisation of lower-rim tetra-O-alkylated p-carboxylatocalix[4]arenes from pyridine results in the formation of both bi-layer and pillar type supramolecular motifs. Full alkylation at the calixarene lower rim has significant influence over the supramolecular self-assembly motif, including preclusion of pyridine guest molecules from the calixarene cavity in the solid state.
Date: July 8, 2009
Creator: Kennedy, Stuart; Teat, Simon J. & Dalgarno, Scott J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Enantioselective Intramolecular Hydroarylation of Alkenes via Directed C-H Bond Activation

Description: Highly enantioselective catalytic intramolecular ortho-alkylation of aromatic imines containing alkenyl groups tethered at the meta position relative to the imine directing group has been achieved using [RhCl(coe){sub 2}]{sub 2} and chiral phosphoramidite ligands. Cyclization of substrates containing 1,1- and 1,2-disubstituted as well as trisubstituted alkenes were achieved with enantioselectivities >90% ee for each substrate class. Cyclization of substrates with Z-alkene isomers proceeded m… more
Date: May 22, 2008
Creator: Harada, Hitoshi; Thalji, Reema; Bergman, Robert & Ellman, Jonathan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Metal inhibition of human alkylpurine-DNA-N-glycosylase activityin base excision repair

Description: Cadmium (Cd{sup 2+}), nickel (Ni{sup 2+}) and cobalt (Co{sup 2+}) are human and/or animal carcinogens. Zinc (Zn{sup 2+}) is not categorized as a carcinogen, and rather an essential element to humans. Metals were recently shown to inhibit DNA repair proteins that use metals for their function and/or structure. Here we report that the divalent ions Cd{sup 2+}, Ni{sup 2+}, and Zn{sup 2+} can inhibit the activity of a recombinant human N-methylpurine-DNA glycosylase (MPG) toward a deoxyoligonucleot… more
Date: February 28, 2006
Creator: Wang, Ping; Guliaev, Anton B. & Hang, Bo
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Synthesis and characterization of nanophase zirconia : reverse micelle method and neutron scattering study.

Description: Zirconia is an important transition-metal oxide for catalytic applications. It has been widely used in automotive exhaust treatment, methanol synthesis, isomerization, alkylation, etc. [1]. Nanophase materials have unique physiochemical properties such as quantum size effects, high surface area, uniform morphology, narrow size distribution, and improvement of sintering rates[2]. Microemulsion method provides the means for controlling the microenvironment under which specific chemical reactions … more
Date: November 23, 1998
Creator: Li, X.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Rh(I)-Catalyzed Direct Arylation of Pyridines and Quinolines

Description: The pyridine and quinoline nuclei are privileged scaffolds that occupy a central role in many medicinally relevant compounds. Consequently, methods for their expeditious functionalization are of immediate interest. However, despite the immense importance of transition-metal catalyzed cross-coupling for the functionalization of aromatic scaffolds, general solutions for coupling 2-pyridyl organometallics with aryl halides have only recently been presented. Direct arylation at the ortho position o… more
Date: July 29, 2008
Creator: Berman, Ashley; Lewis, Jared; Bergman, Robert & Ellman, Jonathan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Chemically modified coal macerals. Separation, density and surface area variations

Description: Two Argonne Premium Coals were O-alkylated and O-acylated using a variety of different reagents, and then separated using density gradient centrifugation (ADGC). The separation data suggested that the hydroxyl groups are fairly evenly distributed in the maceral particles. However, several reagents produced results counter to this generalization, and exhibited enhanced maceral separation. Comparison of ADGC densities and He densities of the modified coals showed several reactivity families that … more
Date: June 1, 1997
Creator: Dyrkacz, G. R. & Bloomquist, C. A. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Process and analytical studies of enhanced low severity co-processing using selective coal pretreatment. Quarterly technical progress report, September--November 1989

Description: This report describes progress on research during the fifth quarter of this contract dealing with applications of coal pretreatment techniques in coal hydroliquefaction by co-processing. The objectives of the project are to investigate various coal pretreatment techniques and to determine the effect of these pretreatment procedures on the reactivity of the coal. Reactivity enhancement will be evaluated under both direct hydroliquefaction and co-processing conditions. Coal conversion utilizing l… more
Date: 1989-12~
Creator: Baldwin, R. M. & Miller, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of a technique for mercury speciation and quantification using gas chromatography/mass spectrometry

Description: One element of concern to DOE is mercury. Mercury was used extensively at the DOE facilities in Oak Ridge, Tennessee from 1950 to 1963 in the process of making lithium deuteride, a component of nuclear weapons. Although both the inorganic and organometallic forms of mercury are toxic to humans, the organic compounds are often more toxic. Since the toxicity of mercury is a function of its chemical form, an understanding of the interactions between commercially discharged mercury, naturally occur… more
Date: July 1, 1997
Creator: Barshick, S. A.; Barshick, C. M.; Britt, P. F.; Vance, M. A. & Duckworth, D. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Swelling behavior of O-alkylated APCS coals as examined by the EPR spin probe method

Description: Known O-alkylation procedures have been used to derivatize the carboxyl and hydroxyl groups in the APCS coals Lewiston-Stockton, Wyodak-Anderson, Beulah-Zap, Illinois {number_sign}6, Upper Freeport, and Pittsburgh {number_sign}8. In general the resulting decrease in hydrogen bonding reduced the cyclical variation in nitroxide spin probe retention observed for nonalkylated coals when small amounts (<1%) of pyridine are present in the toluene swelling solvent. An increase in spin probe retention … more
Date: December 31, 1995
Creator: Ding, Ruisong; Tucker, D. & Kispert, L. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Energy Efficient Catalytic Reaction and Production of Cumene

Description: Alkylation reactions of benzene with propylene using zeolites were studied for their affinity for cumene production. The current process for the production of cumene involves heating corrosive acid catalysts, cooling, transporting, and distillation. This study focused on the reaction of products in a static one-pot vessel using non-corrosive zeolite catalysts, working towards a more efficient one-step process with a potentially large energy savings. A series of experiments were conducted to fin… more
Date: December 1, 2001
Creator: Jarek, Russell L.; Thornberg, Steven M.; Barrow, Stacia; Trudell, Daniel E. & Nenoff, Tina M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Process and analytical studies of enhanced low severity co-processing using selective coal pretreatment. Quarterly technical progress report, June--August 1991

Description: This report describes progress on research during the 12th and final quarter of this contract dealing with applications of coal pretreatment techniques in coal/oil co-processing and direct hydroliquefaction. The overall objectives of the project are to investigate various coal pretreatment techniques and to determine the effect of these pretreatment procedures on the reactivity of the coal. Reactivity enhancement will be evaluated under both direct hydroliquefaction and co-processing conditions… more
Date: 1991-09~
Creator: Baldwin, R. M.; Gaur, S. & Miller, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Studies of Coupled Chemical and Catalytic Coal Conversion Methods

Description: The objective of this research was to convert coal into a soluble substance under mild conditions. The strategy involved two steps, first to breakdown the macromolecular network of coal, and second to add hydrogen catalytically. We investigated different basic reagents that could, in priciple, break down coal`s structure and alkylation strategies that might enhance its solubility. We examined O- and C-alkylation, the importance of the strength of the base, the character of the added alkyl group… more
Date: December 1, 1991
Creator: Stock, L. M.; Chatterjee, K.; Cheng, C.; Ettinger, M.; Flores, F.; Jiralerspong, S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Shale Oil Value Enhancement Research. Quarterly Report, March 1 - May 31, 1996

Description: The overall objective is to develop a new technology for manufacturing valuable marketable products from shale oil. Phase I objectives are to identify desirable components in shale oil, develop separations techniques for those components, identify market needs and to identify plausible products manufacturable from raw shale oil to meet those needs. The quarter`s efforts were concentrated on (a) compound type analysis of shale oil and its extraction products, (b) thermal hydrodealkylation of the… more
Date: December 1996
Creator: Bunger, James W.; Russell, Christopher P.; Tsai, Jesse C. H.; Cogswell, Donald E.; Mihamou, Houssine & Wright, Aaron D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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