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Articles 1 - 30 of 36
Full-Text Articles in Medicinal-Pharmaceutical Chemistry
Fluorination Of Aromatic Ring Systems, Stephen G. Dimagno
Fluorination Of Aromatic Ring Systems, Stephen G. Dimagno
Chemistry Department: Faculty Publications
This disclosure relates to reagents and methods useful in the synthesis of aryl fluorides, for example, in the preparation of 18F labeled radiotracers. The reagents and methods provided herein may be used to access a broad range of compounds, including aromatic compounds, heteroaromatic compounds, amino acids, nucleotides, and synthetic compounds.
Phosphate Esters, Thiophosphate Esters And Metal Thiophosphates As Lubricant Additives, David W. Johnson, John E. Hils
Phosphate Esters, Thiophosphate Esters And Metal Thiophosphates As Lubricant Additives, David W. Johnson, John E. Hils
Chemistry Faculty Publications
Phosphate esters, thiophosphate esters and metal thiophosphates have been used as lubricant additives for over 50 years. While their use has been extensive, a detailed knowledge of how they work has been a much more recent development. In this paper, the use of phosphate esters and thiophosphate esters as anti-wear or extreme pressure additives is reviewed with an emphasis on their mechanism of action. The review includes the use of alkyl phosphates, triaryl phosphates and metal containing thiophosphate esters. The mechanisms of these materials interacting with a range of iron and steel based bearing material are examined.
Molecular Level Interaction Of Human Fibroblast Growth Factor-1 (Hfgf-1) With Phloridzin, Rammohan Paripelly
Molecular Level Interaction Of Human Fibroblast Growth Factor-1 (Hfgf-1) With Phloridzin, Rammohan Paripelly
Masters Theses & Specialist Projects
Fibroblast growth factors (FGFs) are a family of growth factors which includes twenty three proteins. FGFs work as modulators for various cellular activities like mitosis, differentiation and survival. Among the FGF family, human fibroblast growth factor-1 (hFGF-1), which is also known as acidic fibroblast growth factor, is a potent angiogenic agent, involved in the formation of new blood vessels in various tissues. hFGF-1 is regarded as a prototype of the FGF family. It serves as one of the potential targets in tumor inhibition and obesity due to its involvement in new blood vessel formation in cancerous regions and adipose tissues. …
A Novel Mglur5 Antagonist, Mfz 10-7, Inhibits Cocaine-Taking And Cocaine-Seeking Behavior In Rats, Thomas Keck, Mu-Fa Zou, Gui-Hua Bi, Hai-Ying Zhang, Xiao-Fei Wang, Hong-Ju Yang, Ratika Srivastava, Elliott L. Gardner, Zheng-Xiong Xi, Amy Hauck Newman
A Novel Mglur5 Antagonist, Mfz 10-7, Inhibits Cocaine-Taking And Cocaine-Seeking Behavior In Rats, Thomas Keck, Mu-Fa Zou, Gui-Hua Bi, Hai-Ying Zhang, Xiao-Fei Wang, Hong-Ju Yang, Ratika Srivastava, Elliott L. Gardner, Zheng-Xiong Xi, Amy Hauck Newman
College of Science & Mathematics Departmental Research
Pre-clinical studies suggest that negative allosteric modulators (NAMs) of the metabotropic glutamate receptor subtype 5 (mGluR5), including 2-methyl-6-(phenylethynyl)pyridine (MPEP), 3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (MTEP) and fenobam are highly effective in attenuating drug-taking and drug-seeking behaviors. However, both MPEP and MTEP have no translational potential for use in humans because of their off-target effects and short half-lives. Here, we report that 3-fluoro-5-[(6-methylpyridin-2-yl)ethynyl]benzonitrile (MFZ 10-7), a novel mGluR5 NAM, is more potent and selective than MPEP, MTEP and fenobam in both in vitro binding and functional assays. Similar to MTEP, intraperitoneal administration of MFZ 10-7 inhibited intravenous cocaine self-administration, cocaine-induced reinstatement of drug-seeking behavior and …
Structure, Theoretical Studies And Coupling Reactions Of Some New Cyclic Boronic Esters, Andrew Kuttler, Sravanthi Durganala, Albert Fratini, Alexander Morgan, Vladimir Benin
Structure, Theoretical Studies And Coupling Reactions Of Some New Cyclic Boronic Esters, Andrew Kuttler, Sravanthi Durganala, Albert Fratini, Alexander Morgan, Vladimir Benin
Chemistry Faculty Publications
The present report describes the X-ray structural and theoretical studies of some new pinacolboronate esters, and it also outlines the use of the target structures in Suzuki coupling reactions to produce new aromatic or heteroaromatic esters and amides. X-ray structural analysis of the studied compounds revealed that the pinacolborane ring's position with respect to the benzene ring varies, depending on the particular environment. An ortho-positioned carboxylic ester (methyl ester) causes a nearly perpendicular orientation of the pinacolborane unit with respect to the benzene ring, whereas an ortho-positioned amide (N,N-dimethylamide) causes the pinacolborane unit to orient itself nearly coplanar. A plausible …
A Supramolecular Strategy To Assemble Multifunctional Viral Nanoparticles, Limin Chen, Xia Zhao, Yuan Lin, Yubin Huang, Qian Wang
A Supramolecular Strategy To Assemble Multifunctional Viral Nanoparticles, Limin Chen, Xia Zhao, Yuan Lin, Yubin Huang, Qian Wang
Faculty Publications
Using a one-pot approach driven by the supramolecular interaction between β-cyclodextrin and adamantyl moieties, multifunctional viral nanoparticles can be facilely formulated for biomedical applications.
Ionic Conductivity In Non-Ionic Compounds, Usha Kranthi Avala
Ionic Conductivity In Non-Ionic Compounds, Usha Kranthi Avala
Masters Theses & Specialist Projects
The main objective of this work is to investigate the ionic conductivity of the drugs under certain conditions and also to compare the ionic conductivities of drugs determined by single surface sensors and parallel plate sensors. The ionic conductivity of various materials at their pre-melt and melt states are studied in order to further study a recently discovered phenomenon. Polar solids like Lidocaine, Ketoconazole, Procainamide and Nifedipine were examined in this study. Experimental studies show an increase in ionic conductivity in both pre-melt (20 -30 °C below melting temperature) and melt transition regions. Results of ionic conductivity of both parallel …
Selective Catalytic Oxidation Of Organic Sulfides By Iron (Iii) Porphryin Catalysts And Generation Of Iron (Iv)-Oxo Prophyrin Radical Cations, Nawras A. Asiri
Selective Catalytic Oxidation Of Organic Sulfides By Iron (Iii) Porphryin Catalysts And Generation Of Iron (Iv)-Oxo Prophyrin Radical Cations, Nawras A. Asiri
Masters Theses & Specialist Projects
Macrocyclic ligand-complexed transition metal-oxo intermediates are the active oxidizing species in a variety of important biological and catalytic oxidation reactions. Many transition metal catalysts have been designed to mimic the predominant oxidation catalysts in nature, namely the cytochrome P450 enzymes. Iron porphyrin complexes have been the center of research as catalysts. In this study 5,10,15,20- tetramesitylporphyrin (H2TMP) and its corresponding iron complexes FeIII(X)TMP (X= Cl, ClO4, ClO3, NO3, NO2, and BrO3) have been successfully synthesized and fully characterized by UV-vis and NMR spectroscopies. For the catalytic …
Characterization By Nmr Of Reactants And Products Of Hydrofluoroether Isomers, Cf3(Cf2)3och3 And (Cf3)2c(F)Cf2och3, Reacting With Isopropyl Alcohol, Howard Knachel, Vladimir Benin, William E. Moddeman, Janine C. Birkbeck, Thomas A. Kestner, Tayna L. Young
Characterization By Nmr Of Reactants And Products Of Hydrofluoroether Isomers, Cf3(Cf2)3och3 And (Cf3)2c(F)Cf2och3, Reacting With Isopropyl Alcohol, Howard Knachel, Vladimir Benin, William E. Moddeman, Janine C. Birkbeck, Thomas A. Kestner, Tayna L. Young
Chemistry Faculty Publications
The 3M Company product Novec™ 71IPA DL, a mixture of methoxyperfluorobutane, methoxyperfluoroisobutane and 4.5 wt.% isopropyl alcohol, has been found to be very stable at ambient temperature, producing fluoride at the rate of ~1 ppm/year. Our earlier kinetic and theoretical studies have identified the reaction mechanism. This paper identifies the 1H and 19F NMR chemical shifts, multiplicities, and coupling constants of reactants and the major products that result from aging the mixture in sealed Pyrex NMR tubes for periods up to 1.8 years at temperatures from 26 °C to 102 °C. Chemical shifts and coupling constants of fluorine …
A. Catalysis Of Co-Prox By Water-Soluble Rhodium Fluorinated Porphyrins B. Studies Toward Fluorination Of Electron Rich Aromatics By Nucleophilic Fluoride, Shri Harsha Uppaluri
A. Catalysis Of Co-Prox By Water-Soluble Rhodium Fluorinated Porphyrins B. Studies Toward Fluorination Of Electron Rich Aromatics By Nucleophilic Fluoride, Shri Harsha Uppaluri
Department of Chemistry: Dissertations, Theses, and Student Research
The rhodium(III) derivative of a water soluble, heavily fluorinated porphyrin is shown to catalyze the low temperature, low pressure selective oxidation of carbon monoxide in hydrogen gas streams for use in fuel cell applications. The catalytic activity is a direct result of the removal of electron density from the metal center. Selectivity for CO oxidation is a direct consequence of fluorination of the porphyrin periphery, since these substituents enhance the rate of the reaction and prevent the formation of Rh(II)-Rh(II) dimmers. Significantly, the dramatic increase in rhodium hydride acidity caused by fluorination precludes hydrogen activation and generation, thereby permitting preferential …
Interaction Between Lubricants Containing Phosphate Ester Additives And Stainless Steels, David W. Johnson, Matthew Bachus, John E. Hils
Interaction Between Lubricants Containing Phosphate Ester Additives And Stainless Steels, David W. Johnson, Matthew Bachus, John E. Hils
Chemistry Faculty Publications
One way to improve fuel efficiency in today’s jet aircraft engines is to create an environment for higher operating temperatures and speeds. New and improved lubricants and bearing materials must be developed to remain stable in these elevated operating temperatures. Three lubricants, with varying amounts of tricresyl phosphate added as an anti-wear/extreme pressure additive were tested on two different stainless steels at varying temperatures ranging from 300 °C to 350 °C in vacuum. Significant decomposition of the lubricant base-stocks and the phosphate ester additive did occur in most of the trials resulting in the formation of carboxylic acids and phenols. …
Reactions Of Platinum(Ii) Compounds With Selenium Containing Amino Acids, Stephanie Robey
Reactions Of Platinum(Ii) Compounds With Selenium Containing Amino Acids, Stephanie Robey
Masters Theses & Specialist Projects
Platinum(II) anticancer medications essentially react with DNA forming kinks in
the double helix of DNA and causing apoptosis. It has also been noted that these
anticancer medications react with methionine and cysteine in the body. With the new discoveries of selenium containing amino acids including selenomethionine and selenocysteine, new research is ongoing to see what types of products can be formed from these amino acids. Our research reacts [Pt(Met-S,N)Cl2] 2+ with selenomethionine to determine what types of products are produced. Monochelates including [Pt(SeMet-Se,N)Cl2] 2+ have formed two isomers, …
Synthesis Of Rhenium And Manganese Pyridazoal Complexes, Jesse Evans
Synthesis Of Rhenium And Manganese Pyridazoal Complexes, Jesse Evans
Masters Theses & Specialist Projects
Pyridazines are a heterocyclic aromatic compound containing a characteristic N-N bond that are utilized in many fields, including medicine and electronics. It is this latter field that Dr. Snyder's research group is focused upon. Organometallic compounds are a better conducting material than the current inorganic compounds used in electronics due to better conductance of electricity, lower production cost, and the ability to be formed into thin films. With this in mind, Dr. Snyder's research group has set out to synthesize organometallic compounds for this purpose. Following procedures set forth by Snyder etc, and altered to form an off-metal route, we …
Effects Of Cisplatin Analog Size On The Reaction With Dna Bases, Swathi Nandala
Effects Of Cisplatin Analog Size On The Reaction With Dna Bases, Swathi Nandala
Masters Theses & Specialist Projects
Cancer is the second leading cause of death in the United States. Cisplatin is one of the well-known anti-cancer agents used to treat testicular and ovarian cancers. It mainly binds to the DNA bases, which leads to cell death. The cytotoxic activity of the cisplatin analogs is due to the interaction of platinum with nucleotides like adenine at N7 or N1 position and guanine at N7 position. Guanine is the primary target for cisplatin analogs whereas adenine is the secondary target. Cisplatin analogs, [Pt(Me5dien)(D2O)]2+[Me5dien = N,N,N’,N’,N’’-pentamethyl diethylene triamine] and …
Dimethyl Sulfoxide (Dmso) Exacerbates Cisplatin-Induced Sensory Hair Cell Death In Zebrafish (Danio Rerio), Phillip M. Uribe, Melissa A. Mueller, Julia S. Gleichman, Matthew D. Kramer, Qi Wang, Martha Sibrian-Vazquez, Robert M. Strongin, Peter S. Steyger, Douglas A. Cotanche, Jonathan I. Matsui
Dimethyl Sulfoxide (Dmso) Exacerbates Cisplatin-Induced Sensory Hair Cell Death In Zebrafish (Danio Rerio), Phillip M. Uribe, Melissa A. Mueller, Julia S. Gleichman, Matthew D. Kramer, Qi Wang, Martha Sibrian-Vazquez, Robert M. Strongin, Peter S. Steyger, Douglas A. Cotanche, Jonathan I. Matsui
Chemistry Faculty Publications and Presentations
Inner ear sensory hair cells die following exposure to aminoglycoside antibiotics or chemotherapeutics like cisplatin, leading to permanent auditory and/or balance deficits in humans. Zebrafish (Danio rerio) are used to study drug-induced sensory hair cell death since their hair cells are similar in structure and function to those found in humans. We developed a cisplatin dose-response curve using a transgenic line of zebrafish that expresses membrane-targeted green fluorescent protein under the control of the Brn3c promoter/enhancer. Recently, several small molecule screens have been conducted using zebrafish to identify potential pharmacological agents that could be used to protect sensory hair cells …
Probing The Bifunctional Catalytic Activity Of Ceria Nanorods Towards The Cyanosilylation Reaction, Gonghua Wang, Lu Wang, Xiang Fei, Yunyun Zhou, Renat F. Sabirianov, Wai-Ning Mei, Chin Li Cheung
Probing The Bifunctional Catalytic Activity Of Ceria Nanorods Towards The Cyanosilylation Reaction, Gonghua Wang, Lu Wang, Xiang Fei, Yunyun Zhou, Renat F. Sabirianov, Wai-Ning Mei, Chin Li Cheung
Chemistry Department: Faculty Publications
Ceria nanorods were demonstrated to be an active, bifunctional catalyst for the cyanosilylation of aldehydes. The catalytic activity of ceria was shown to be positively correlated with a decrease in the coordination numbers of neighbouring oxygen atoms around cerium atoms in the catalyst. Chemisorption and density functional theory studies suggested that the coordinatively unsaturated cerium sites exposed by the surface oxygen vacancy defects functioned as Lewis acid sites and the neighbouring oxygen atoms behaved as Lewis base sites in the catalytic cycle.
An Expanded Genetic Code In Mammalian Cells With A Functional Quadruplet Codon, Wei Niu, Peter G. Schultz, Jiantao Guo
An Expanded Genetic Code In Mammalian Cells With A Functional Quadruplet Codon, Wei Niu, Peter G. Schultz, Jiantao Guo
Chemistry Department: Faculty Publications
We have utilized in vitro evolution to identify tRNA variants with significantly enhanced activity for the incorporation of unnatural amino acids into proteins in response to a quadruplet codon in both bacterial and mammalian cells. This approach will facilitate the creation of an optimized and standardized system for the genetic incorporation of unnatural amino acids using quadruplet codons, which will allow the biosynthesis of biopolymers that contain multiple unnatural building blocks.
Iodonium Cyclophanes For Secure Arene Functionalization, Stephen Dimagno
Iodonium Cyclophanes For Secure Arene Functionalization, Stephen Dimagno
Chemistry Department: Faculty Publications
This disclosure relates to compounds, reagents, and methods useful in the synthesis of aryl fluorides, for example, in the preparation of 18F labeled radiotracers. For example, this disclosure provides universal “locked” aryl substituents that result in StereoElectronic Control of Unidirectional Reductive Elimination (SECURE) from diaryliodonium salts. The reagents and methods provided herein may be used to access a broad range of compounds, including aromatic compounds, heteroaromatic compounds, amino acids, nucleotides, and synthetic compounds.
Probing The Bifunctional Catalytic Activity Of Ceria Nanorods Towards The Cyanosilylation Reaction, Gonghua Wang, Lu Wang, Xiang Fei, Yunyun Zhou, Renat F. Sabirianov, Wai Ning Mei, Chin Li Cheung
Probing The Bifunctional Catalytic Activity Of Ceria Nanorods Towards The Cyanosilylation Reaction, Gonghua Wang, Lu Wang, Xiang Fei, Yunyun Zhou, Renat F. Sabirianov, Wai Ning Mei, Chin Li Cheung
Chemistry Department: Faculty Publications
Ceria nanorods were demonstrated to be an active, bifunctional catalyst for the cyanosilylation of aldehydes. The catalytic activity of ceria was shown to be positively correlated with a decrease in the coordination numbers of neighbouring oxygen atoms around cerium atoms in the catalyst. Chemisorption and density functional theory studies suggested that the coordinatively unsaturated cerium sites exposed by the surface oxygen vacancy defects functioned as Lewis acid sites and the neighbouring oxygen atoms behaved as Lewis base sites in the catalytic cycle.
Single Transcriptional And Translational Preq1 Riboswitches Adopt Similar Pre-Folded Ensembles That Follow Distinct Folding Pathways Into The Same Ligand-Bound Structure, Krishna C. Suddala, Arlie J. Rinaldi, Jun Feng, Anthony M. Mustoe, Catherine D. Eichhorn, Joseph A. Liberman, Joseph E. Wedekind, Hashim M. Al-Hashimi, Charles L. Brooks Iii, Nils G. Walter
Single Transcriptional And Translational Preq1 Riboswitches Adopt Similar Pre-Folded Ensembles That Follow Distinct Folding Pathways Into The Same Ligand-Bound Structure, Krishna C. Suddala, Arlie J. Rinaldi, Jun Feng, Anthony M. Mustoe, Catherine D. Eichhorn, Joseph A. Liberman, Joseph E. Wedekind, Hashim M. Al-Hashimi, Charles L. Brooks Iii, Nils G. Walter
Chemistry Department: Faculty Publications
Riboswitches are structural elements in the 50 untranslated regions of many bacterial messenger RNAs that regulate gene expression in response to changing metabolite concentrations by inhibition of either transcription or translation initiation. The preQ1 (7-aminomethyl-7-deazaguanine) riboswitch family comprises some of the smallest metabolite sensing RNAs found in nature. Once ligand-bound, the transcriptional Bacillus subtilis and translational Thermoanaerobacter tengcongensis preQ1 riboswitch aptamers are structurally similar RNA pseudoknots; yet, prior structural studies have characterized their ligand-free conformations as largely unfolded and folded, respectively. In contrast, through single molecule observation, we now show that, at nearphysiological Mg2+ concentration and pH, …
Lyrica, Shannon Hayward
Lyrica, Shannon Hayward
Natural Sciences Student Research Presentations
Illustrates the chemical components of Lyrica, a pain management medication.
Drug Delivery Via Nanoparticles, Laura Ward
Drug Delivery Via Nanoparticles, Laura Ward
Natural Sciences Student Research Presentations
Much research is being conducted to investigate the potential use of nanoparticles as an efficient drug delivery system. Important characteristics of nanoparticles that affect how they interact with biological systems include size, composition ,surface characteristics and shape. One of the many potential medical uses of nanoparticles is targeted drug delivery; nanoparticles have the potential to deliver concentrated amounts of medication to select areas of the body, reducing toxic effects in healthy areas of the body.
Cymbalta, Ryann S. Elder
Cymbalta, Ryann S. Elder
Natural Sciences Student Research Presentations
Poster outlines the chemical make-up and uses of Cymbalta (Duloxetine Hydrochloride) which is used to treat major depression, generalized anxiety, fibromyalgia, and diabetic neuropathy. This is a project for the Natural Sciences Poster Session at Parkland College.
Levothyroxine, Vanessa Powell
Levothyroxine, Vanessa Powell
Natural Sciences Student Research Presentations
Poster outlines the chemical make-up and uses of the thyroid medication, Levothyroxine. This is a project for the Natural Sciences Poster Session at Parkland College.
Xenical, Megan Brown
Xenical, Megan Brown
Natural Sciences Student Research Presentations
Poster outlines the chemical make-up and uses of the weight loss drug, Xenical. This is a project for the Natural Sciences Poster Session at Parkland College.
Effects Of Iodine On Radioactive Treatment, Jun Ho Park
Effects Of Iodine On Radioactive Treatment, Jun Ho Park
Natural Sciences Student Research Presentations
This poster investigates the causes and treatments of radioactive exposure and the diseases that follow and outlines how Iodine plays an effective treatment. Focuses on a specific isotope of Iodine, I-131, investigating its effects and uses in radioactive activity and treatment. This is a project for the Natural Sciences Poster Session at Parkland College.
Development Of Affinity Microcolumns For Drug–Protein Binding Studies In Personalized Medicine: Interactions Of Sulfonylurea Drugs With In Vivo Glycated Human Serum Albumin, Jeanethe Anguizola, K. S. Joseph, Omar S. Barnaby, Ryan Matsuda, Guadalupe Alvarado, William Clarke, Ronald Cerny, David S. Hage
Development Of Affinity Microcolumns For Drug–Protein Binding Studies In Personalized Medicine: Interactions Of Sulfonylurea Drugs With In Vivo Glycated Human Serum Albumin, Jeanethe Anguizola, K. S. Joseph, Omar S. Barnaby, Ryan Matsuda, Guadalupe Alvarado, William Clarke, Ronald Cerny, David S. Hage
David Hage Publications
This report used high-performance affinity microcolumns to examine the changes in binding by sulfonylurea drugs to in vivo glycated HSA that had been isolated from individual patients with diabetes. An immunoextraction approach was developed to isolate HSA and glycated HSA from clinical samples, using only 20 μL of plasma or serum and 6–12 nmol of protein to prepare each affinity microcolumn. It was found that the affinity microcolumns could be used in either frontal analysis or zonal elution studies, which typically required only 4–8 min per run. The microcolumns had good stability and allowed data to be obtained for multiple …
Overexpression Of Human Fatty Acid Transport Protein 2/Very Long Chain Acyl-Coa Synthetase 1 (Fatp2/Acsvl1) Reveals Distinct Patterns Of Trafficking Of Exogenous Fatty Acids, Elaina M. Melton, Ronald Cerny, Concetta C. Dirusso, Paul N. Black
Overexpression Of Human Fatty Acid Transport Protein 2/Very Long Chain Acyl-Coa Synthetase 1 (Fatp2/Acsvl1) Reveals Distinct Patterns Of Trafficking Of Exogenous Fatty Acids, Elaina M. Melton, Ronald Cerny, Concetta C. Dirusso, Paul N. Black
Ronald Cerny Publications
In mammals, the fatty acid transport proteins (FATP1 through FATP6) are members of a highly conserved family of proteins, which function in fatty acid transport proceeding through vectorial acylation and in the activation of very long chain fatty acids, branched chain fatty acids and secondary bile acids. FATP1, 2 and 4, for example directly function in fatty acid transport and very long chain fatty acids activation while FATP5 does not function in fatty acid transport but activates secondary bile acids. In the present work, we have used stable isotopically labeled fatty acids differing in carbon length and saturation in cells …
Preparation Of Phosphonoterephthalic Acids Via Palladium-Catalyzed Coupling Of Aromatic Iodoesters, Nathaniel Ivan, Vladimir Benin, Alexander Morgan
Preparation Of Phosphonoterephthalic Acids Via Palladium-Catalyzed Coupling Of Aromatic Iodoesters, Nathaniel Ivan, Vladimir Benin, Alexander Morgan
Chemistry Faculty Publications
The current article reports in detail the preparation of two phosphonoterephthalic acids: 2-phosphonoterephthalic acid (1) and 2,5-diphosphonoterephthalic acid (2). Efficient, scalable syntheses have been developed for both compounds based on Pd-catalyzed coupling reactions of iodinated terephthalate esters. Phosphonoterephthalic acids are potentially useful as flame-retardant additives or as monomers for the construction of acid-pendant polymer chains.
Reaction Between Polyol-Esters And Phosphate Esters In The Presence Of Metal Carbides, David W. Johnson, Carolyn Iacullo, John E. Hils
Reaction Between Polyol-Esters And Phosphate Esters In The Presence Of Metal Carbides, David W. Johnson, Carolyn Iacullo, John E. Hils
Chemistry Faculty Publications
The reaction of metal carbides with polyol esters found in aerospace lubricants and phosphate esters commonly used as additives was investigated. Carbides were of particular interest since modern materials under consideration at high temperature bearings have surfaces that are primarily metal carbides. Vanadium and chromium carbide were found to react with the ester and phosphate ester by a transesterification reaction, producing an alkyl phosphate which is less stable than the aromatic phosphate esters. In the process, the metal carbide is converted to the metal phosphate and metal polyphosphate, evidenced by the infrared and Raman spectra of the solid residue and …