Relevant bibliographies by topics / Phosphite esters

Academic literature on the topic 'Phosphite esters'

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Published: 6 September 2023

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Journal articles on the topic "Phosphite esters"

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Koguchi, Shinichi, Aya Mihoya, Yuga Shibuya, Akane Ito, Anna Toyoda, and Makoto Oba. "Aerobic Oxidation of Phosphite Esters to Phosphate Esters by Using an Ionic-Liquid-Supported Organotelluride Reusable Catalyst." Synlett 31, no. 20 (October 16, 2020): 2043–45. http://dx.doi.org/10.1055/s-0040-1706068.

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AbstractWe describe the synthesis of an ionic-liquid (IL)-supported organotelluride catalyst and its application as a recyclable catalyst for the aerobic oxidation of phosphite esters to phosphate esters. This method shows high conversion rates, allows the ready isolation and purification of the resulting products, and exhibits good reusability of the catalyst.
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Saady, Mourad, Luc Lebeau, and Charles Mioskowski. "Selective Monodeprotection of Phosphate, Phosphite, Phosphonate, and Phosphoramide Benzyl Esters." Journal of Organic Chemistry 60, no. 9 (May 1995): 2946–47. http://dx.doi.org/10.1021/jo00114a059.

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Wang, Hui, and Donald J. Graves. "Calcineurin-catalyzed reaction with phosphite and phosphate esters of tyrosine." Biochemistry 30, no. 12 (March 26, 1991): 3019–24. http://dx.doi.org/10.1021/bi00226a006.

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Anary-Abbasinejad, Mohammad, Alireza Hassanabadi, and Hossein Anaraki-Ardakani. "One-pot Synthesis of Stable Phosphite Ylides by three component reaction between Acetylenic Esters, Aldehyde Semicarbazones and Tributyl or Triethyl Phosphite." Journal of Chemical Research 2007, no. 8 (August 2007): 455–57. http://dx.doi.org/10.3184/030823407x236372.

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Schwetlick, K., T. König, C. Rüger, J. Pionteck, and W. D. Habicher. "Chain-breaking antioxidant activity of phosphite esters." Polymer Degradation and Stability 15, no. 2 (January 1986): 97–108. http://dx.doi.org/10.1016/0141-3910(86)90065-0.

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Zayed, M. F., Y. O. El-khoshnieh, N. Khir El-din, and L. S. Boulos. "THE REACTION OF PHOSPHITE ESTERS AND TRIS(DIMETHYLAMIN0)PHOSPHINE WITH 1,4- NAPHTHOQUINONEMONOBENZENESULFONIMINE." Phosphorus, Sulfur, and Silicon and the Related Elements 54, no. 1-4 (September 1990): 81–86. http://dx.doi.org/10.1080/10426509008042123.

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SAADY, M., L. LEBEAU, and C. MIOSKOWSKI. "ChemInform Abstract: Selective Monodeprotection of Phosphate, Phosphite, Phosphonate, and Phosphoramide Benzyl Esters." ChemInform 26, no. 37 (August 17, 2010): no. http://dx.doi.org/10.1002/chin.199537089.

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Oba, Makoto, Yasunori Okada, Kozaburo Nishiyama, and Wataru Ando. "Aerobic Photooxidation of Phosphite Esters Using Diorganotelluride Catalysts." Organic Letters 11, no. 9 (May 7, 2009): 1879–81. http://dx.doi.org/10.1021/ol900240s.

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Drewe, William C., Martin P. Payne, and Richard V. Williams. "Phosphite esters: a novel class of contact allergen." Contact Dermatitis 76, no. 5 (April 7, 2017): 312–14. http://dx.doi.org/10.1111/cod.12704.

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Liu, Chunrong, Chung-Min Park, Difei Wang, and Ming Xian. "Phosphite Esters: Reagents for Exploring S-Nitrosothiol Chemistry." Organic Letters 20, no. 24 (December 6, 2018): 7860–63. http://dx.doi.org/10.1021/acs.orglett.8b03393.

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Dissertations / Theses on the topic "Phosphite esters"

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Malhiac, Catherine. "Synthèses sélectives à l'aide de réactifs siliciés (Phosphite-Acétals de cétène silylés). Applications à la préparation d'aminophosphonates et d'esters 2,3-difonctionnels." Rouen, 1993. http://www.theses.fr/1993ROUES007.

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Une méthode générale de préparation de 1-dialkylaminophosphonates est proposée. Cette voie d'accès à partir d'aldéhydes et de dérivés silylés d'amine et de phosphite est générale et directe. Les aminophosphonates sont obtenus avec de bons rendements et une pureté très satisfaisante. L'extension à des aldéhydes 2,3-éthyléniques n'a pas fourni les résultats initialement attendus. Une étude de cette réaction complexe a permis de mettre en évidence la formation majoritaire 1,3-dialkylaminophosphonates, composés nouveaux et potentiellement intéressants. La formation et l'utilisation des carbanions dérivés 1-dialkylaminophosphonates ont conduit à des résultats globalement négatifs. Une seconde partie concerne la préparation sélective d'esters 2,3-difonctionnels via un acétal de cétène silylé porteur d'un groupement oxygéné ou aminé. Les conditions de formation des dérivés silylés des alkoxyesters ont été très nettement améliorées par rapport à la littérature. Leur utilisation pour des réactions de type aldolique avec des aldéhydes et des imines a été étudiée. L'emploi de bromure de zinc à 0°C permet un accès stéréosélectif aux 3-hydroxy(amino)-2-alkoxyesters. Un travail similaire a été réalisé à partir d'iminoesters. La préparation et l'isolement des dérivés silylés sont décrits. Un complément d'étude est effectué avec les aldéhydes et les imines
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Marriott, Robert Edward. "Accelerated cleavage of phosphate esters." Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/272476.

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Cocks, Sarah. "The electrophilicity and chemistry of phosphate esters." Doctoral thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/16377.

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Bibliography: pages 380-395.
A series of phosphate esters containing the E.-nitrophenyl moiety as a leaving group were synthesised and their base catalysed hydrolysis and electron impact-induced fragmentations studied. Heterocyclic ester substituents were present in some of the substrates and in-this sense they were considered as models for a nucleotide molecule containing both the 11 energy-rich11 phosphate bond and the nitrogen heterocyclic ring. The relative reactivity of the phosphorus-E,-nitrophenoxide bond was taken as a probe for nitrogen (pyridyl or quinolyl) participation in the substitution reaction. Although the heterocyclic derivatives show that the introduction of the nitrogen centre increases the rate of base catalysed hydrolysis, the reactivity enhancement is. not significant and results probably from polar effects rather than from intra-molecular catalysis. A comparison of the mass spectra of the heterocyclic and carbocyclic analogues, reveal differences which are significant (in the pyridyl substrates) and dramatic (in the quinolyl substrate) with regard to the fragmentation involving the E.-nitrophenoxy radical expulsion and formation of the corresponding phosphorylium ion. Synthetic approaches towards dimethylaryl and dimethyl(arylalkyl) phosphates are discussed. Nucleophilic displacement at the methyl ester carbon, and in particular the oxygen+ nitrogen methyl group transfer in these substrates occurs readily, complicating the synthetic procedures and lowering the stability of products. Dimethyl-(2-pyridylmethyl) phosphate isomerises in water to the zwitterionic N-methylpyridinium derivative via bimolecular methylation. The kinetics of the reaction were studied and no evidence for intra-molecular methyl transfer was obtained. - ii - The isomerisation of dimethyl-(quinolin-8-yl) phosphate in water also provides evidence for the bimolecular methylation. The crystal and molecular structure of dimethyl-(quinolin-8-yl) phosphate was determined and has revealed that the orientation of the CH 3 groups in the crystal provide no indication for the occurrence of methyl transfer in the solid state. The dynamics of the prepared phosphate derivatives studied in solutions were also investigated by means of mass spectrometry. Fragmentation patterns and their relative contributions are presented and discussed. The effect of solvent on the rates of the reaction between trimethyl phosphate and i) pyridine and ii) 4-(dimethylamino)pyridine, was studied at 25 - 65°C using NMR techniques. The solvents used were DzO, CD30D, CD3CN and DzO/CD30D and DzO/CD3CN mixtures. Water (DzO) is the most effective medium for the methyl transfer reaction. We attribute this to the strong hydrogen bonding between water and the departing dimethyl phosphate anion in the transition state. Activation parameters obtained for the reactions in pure solvents confirmed our interpretation of the hydrogen bonding effect operating in the transition state. Fragmentation of S-arylethyl phosphates has been investigated. A novel feature is exhibited by S-arylethyl phosphorochloridates. They easily decompose thermally yielding 1-chloro-2-arylethanes and/or arylethylenes presumably via concerted C-O and P-Cl bond fission involving a phenonium ion intermediate and expulsion of a metaphosphate species.
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Butt, Afshan Hena. "Syntheses of analogues of some important phosphate esters." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369394.

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Bond, Dianne Ruth. "A structure-reactivity study of selected phosphate esters." Doctoral thesis, University of Cape Town, 1985. http://hdl.handle.net/11427/22521.

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Bibliography: pages 201-208.
A comparative X-ray analysis study of bis(4-nitrophenyl)-8-quinolinyl phosphate (4), 1-naphthyl-bis(4-nitrophenyl) phosphate (5) and 4-nitrophenyl -8-quinolinyl phosphate (5) was undertaken. In compound (4) donor-acceptor nitrogen-phosphorus interactions change the geometry of the molecule from tetrahedral to quasi trigonal bipyramidal, thus the structure may be considered as an "early stage" of the intramolecular displacement of the 4-ni trophenoxide group. In the diester (6) this interaction is replaced by intermolecular N+ -H...O- hydrogen bonding. In addition the intramolecular non-bonded potential energies of (4) and (5) were calculated and the minimum-energy conformations were compared with those determined by X-ray diffraction. These results confirm the differences observed in the intramolecular interactions operative in (4) and (5). The mass spectra of (4) and (5) are dramatically different with respect to the fragmentation involving expulsion of the 4-nitrophenoxy radical and formation of the corresponding phosphorylitum ion by nitrogen participation. Rate measurements for the base-catalysed hydrolysis of the first P-OPNP linkage show that (4) is not significantly more reactive than (5) and provide no evidence for intramolecular nucleophilic catalysis in the hydrolysis of (4). The crystal and molecular structure of 1-naphthyl acetate (7) was determined. Attempts to grow suitable crystals of 8-quinolinyl acetate (8) failed and therefore its structure could not be elucidated. Possible intramolecular nitrogen - carbonyl carbon interactions operative in (8) could therefore not be established.
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Haffey, Samuel Fraad 1973. "Numerical models of phosphate esters in the Chattahoochee River." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/29405.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2004.
Includes bibliographical references (leaves 124-127).
A numerical model was constructed to assess the magnitude of organophosphoric acid triester sinks in the Chattahoochee River and to identify concentration patterns downstream of point source discharges. The model was built using WASP5 and supporting software packages. The model simulated mass transport of tri-butyl phosphate, tri (2-butoxyethyl) phosphate, and tri (2-chloroethyl) phosphate within a reach of the river bounded by Buford Dam and Northern Atlanta. Several potential mechanisms for the removal of the phosphate esters from the water column were considered. These were biodegradation, sorption to settling solids, volatilization, and oxidation by free radicals. Of the three phosphate esters considered by the model, tri (2-chloroethyl) phosphate was predicted to be the most resistant to degradation by natural attenuation processes. Tri (2- butoxyethyl) phosphate showed the most potential for degradation in surface waters. Biodegradation and sorption to settling solids were predicted to be the most effective processes for the removal of tri (2-butoxyethyl) phosphate. Concentration patterns at several locations downstream of point source discharges were predicted for the three compounds. Concentration patterns were found to be affected by the diurnal flow variation caused by the operation of two hydroelectric dams within the modeled reach.
by Samuel Fraad Haffey.
M.Eng.
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Iagrossi, Anna. "Stereochemical studies of reactions of phosphate and thiophosphate esters." Thesis, University of Leicester, 1988. http://hdl.handle.net/2381/33748.

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Nucleophilic substitution reactions involving phosphate monoesters have been investigated. Two general syntheses of O-alkyl or O-aryl [16O,18O] thiophosphate monoesters are reported. An independent and general method for the determination of the enantiomeric excess of isotopically chiral thiophosphate monoesters has been developed and the absolute configurations of the diastereoisomers of (2R)-O-(O-ethyl thiophosphoryl)-3, 4S-dimethyl-5S-phenyl-l,3,2-oxazaphos- pholidin-2-one have been assigned. The solvolysis of p-nitrophenyl [R-16O,18O] thiophosphate in ethanol gives rise to ethyl [16O, 18O] thiophosphate with a large degree of racemisation of configuration (~80%). This observation is consistent with the formation of a thiometaphosphate intermediate of finite life-time which is then trapped by ethanol with accompanying loss of stereochemical integrity. This study provides the first direct evidence for a monomeric thiometaphosphate in protic solvent. During the course of developing the stereochemical analysis, it was noted that O-ethyl thiophosphate reacts with cis-2-chloro-3, 4-dimethyl- 5-phenyl-l, 3, 2-oxazaphospholidin-2-one with ca. 10% inversion and 90% retention of configuration. This system also reacts with fluoride ion with complete loss of stereochemistry. Cis-2-chloro-3, 4-dimethyl-5- phenyl-l, 3, 2-oxazaphospholidin-2-one and the corresponding 2-thione are epimerised to the more stable trans isomers by pyridine and other nucleophilic catalysts. These reactions require an in-line exocyclic displacement at a phosphorus centre held in a five-membered ring. Nucleophilic substitution at di- and tri-esters have also been studied. The stereochemical course of the hydrolysis of the 1, 3, 2-dioxaphosphor- inan-2-one system involving good leaving groups such as chloride and fluoride occur with inversion of configuration via an in-line mechanism, whereas hydrolysis of this system involving poor leaving groups occurs with retention of configuration via a pseudorotation mechanism.
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Tarrat-Iché, Nathalie. "Etude théorique des mécanismes d'hydrolyse des esters de phosphate." Toulouse 3, 2005. http://www.theses.fr/2005TOU30212.

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Les esters de phosphate jouent un rôle fondamental du point de vue biologique. Cependant, les mécanismes d'hydrolyse des monoesters restent encore très controversés (principalement en raison de la grande stabilité de ces derniers en solution). Les méthodes de la chimie quantique moderne constituent une alternative de choix pour élucider, au niveau atomique, les mécanismes de ces réactions. Dans ce mémoire nous avons validé l'utilisation de calculs quantiques (DFT/B3LYP) couplés à un modèle continu de solvant pour étudier les mécanismes d'hydrolyse des tri- et diesters de phosphate, ces derniers faisant intervenir un intermédiaire ou un état de transition de type phosphorane. La même approche est appliquée aux mécanismes d'hydrolyse des monoesters de phosphate. Par comparaison avec les résultats obtenus dans le cas des di- et triesters, cette étude montre que la réactivité d'un ester protoné peut différer de celle de son dérivé méthylé, pour lequel intervient un " intermédiaire " phosphorane
Phosphate esters play a fundamental role in many biological processes. Unfortunately, the detailed understanding of how monoesters hydrolysis reactions proceed is still subject of debate (this is largely due to the kinetic stability of phosphate monoesters). Modern quantum chemistry methods seems to be a good alternative to elucidate these reaction mechanisms. In this thesis, we have validated the use of quantum calculation (DFT/B3LYP) coupled with a continuum solvation model by studying hydrolysis mechanism of phosphate tri- and diesters. In these cases, the scientific community is unanimous on the fact that they involve pentacovalent phosphorane intermediate or transition state. The same approach is applied to the hydrolysis mechanism of phosphate monoesters. By comparison with the results obtained in the case of the di- and triesters, it is observed that the reactivity of a protonated ester can differ from that of its methylated derivative, for which a phosphorane “intermediate” is occuring
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Walsh, Owen Anthony. "Computer simulation of phosphate ester hydrolysis reactions." Thesis, University of Oxford, 2001. http://ora.ox.ac.uk/objects/uuid:bf94b5d1-c550-4af5-849c-4438000450aa.

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Phosphate esters and their hydrolysis reactions underpin many of the most important reactions in biology and have therefore been the focus of continued research. In this thesis, a range of theoretical studies on two phosphate ester hydrolysis reactions is presented. Particular attention is paid to the role of solvent in these reactions. The first reaction studied is the hydrolysis of dimethyl phosphate. A study using density functional theory examines three possible mechanisms for this reaction in the gas phase and the presence of solvent is also considered through the use of reaction field methods. The base-catalysed mechanism for this reaction receives further attention and the reaction energy profile in solution is adiabatically mapped using two different hybrid QM/MM potentials. The use of a QM/MM potential facilitates an atomistic representation of the solvent. Another study determines the potential of mean force for this reaction by simulating the reaction using QM/MM molecular dynamics simulations in conjunction with umbrella sampling methods. Both QM/MM studies demonstrate that, in solution, the rate-determining step for the base-catalysed reaction is the cleavage of the bond between the phosphorous and the leaving group. The QM/MM studies also established that the reaction proceeds via the formation of a short-lived pentacoordinated intermediate species. The second reaction studied was the base-catalysed hydrolysis of methyl ribose phosphate, a realistic model of the nonenzymatic hydrolysis of RNA. Since the hydrolysis of thio-substituted analogues of RNA have been the study of many experimental studies probing the mechanism of RNA hydrolysis, theoretical studies of the hydrolysis of two thio analogues of methyl ribose phosphate are also presented. The results of these studies provide valuable insight into the mechanism of RNA hydrolysis and concludes that the cleavage of P-O5' bond corresponds to the reaction transition state.
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Lad, Chetan Shantilal. "Mechanics and reactivity of phosphate ester hydrolysis." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269339.

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Books on the topic "Phosphite esters"

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Dallemagne, Gérard. Les esters phosphates: Fluides hydrauliques. Toulouse, France: Cépaduès-Éditions, 2012.

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United States. Agency for Toxic Substances and Disease Registry, ed. Draft toxicological profile for phosphate ester flame retardants. Atlanta, Ga: U.S. Department of Health and Human Services, Public Health Service, Agency for Toxic Substances and Disease Registry, 2009.

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Butt, Afshan Hena. Syntheses of analogues of some important phosphate esters. Birmingham: University of Birmingham, 2001.

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United States. National Aeronautics and Space Administration., ed. Phospha-s-triazines and related compositions of improved hydrolytic and thermal stability. [Washington, DC: National Aeronautics and Space Administration, 1996.

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United States. National Aeronautics and Space Administration., ed. Phospha-s-triazines and related compositions of improved hydrolytic and thermal stability. [Washington, DC: National Aeronautics and Space Administration, 1996.

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United States. National Aeronautics and Space Administration., ed. Phospha-s-triazines and related compositions of improved hydrolytic and thermal stability. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Deckman, Douglas E. Vaporphase deposition studies of phosphate esters on metal and ceramic surfaces. Washington, D.C: National Institute of Standards and Technology, 1988.

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Deckman, Douglas E. Vapor phase deposition studies of phosphate esters on metal and ceramic surfaces. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1988.

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M, Hsu S., Klaus E. Erwin 1921-, and National Institute of Standards and Technology (U.S.), eds. Vapor phase deposition studies of phosphate esters on metal and ceramic surfaces. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1991.

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Esch, G. J. van. Flame retardants: Tris(2-butoxyethyl) phosphate, tris(2-ethylhexyl) phosphate and tetrakis(hydroxymethyl) phosphonium salts. Geneva: World Health Organization, 2000.

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Book chapters on the topic "Phosphite esters"

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Schwetlick, Klaus. "Mechanisms of Antioxidant Action of Phosphite and Phosphonite Esters." In Mechanisms of Polymer Degradation and Stabilisation, 23–60. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-3838-3_2.

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Phillips, W. David. "Ashless Phosphate Esters." In Encyclopedia of Tribology, 113–18. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_929.

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Gerlt, John A., Jeffrey A. Coderre, and Shujaath Mehdi. "Oxygen Chiral Phosphate Esters." In Advances in Enzymology - and Related Areas of Molecular Biology, 291–380. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/9780470123010.ch4.

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Kane, Robert R., Christine S. Lee, Cindy L. Coe, Melissa A. St. Rose, Karin Drechsel, and M. Frederick Hawthorne. "Novel Carboranyl Diols and Their Derived Phosphate Esters." In Advances in Neutron Capture Therapy, 293–96. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2978-1_61.

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Mitra, Amitabha, and David A. Atwood. "Phosphate Ester Cleavage with Binuclear Boron Chelates." In ACS Symposium Series, 390–409. Washington, DC: American Chemical Society, 2005. http://dx.doi.org/10.1021/bk-2005-0917.ch028.

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Green, Joseph. "Brominated Phosphate Ester Flame Retardants for Engineering Thermoplastics." In ACS Symposium Series, 253–65. Washington, DC: American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0425.ch017.

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Hobbs, Matthew G., and Peter Dufresne Jr. "Improved Phosphate Ester Condition Monitoring Using Membrane Patch Colorimetry." In Standard Guides and Practices that Support the Lubricant Condition Monitoring Industry, 186–208. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2022. http://dx.doi.org/10.1520/stp163420200078.

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Boethling, Robert S., and Jon C. Cooper. "Environmental fate and effects of triaryl and tri-alkyl/aryl phosphate esters." In Residue Reviews, 49–99. New York, NY: Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4612-5104-0_2.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of diiron(III) complex containing phosphate ester bridges." In Magnetic Properties of Paramagnetic Compounds, 435–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_240.

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Beadle, James R., and Karl Y. Hostetler. "Alkoxyalkyl Ester Prodrugs of Antiviral Nucleoside Phosphates and Phosphonates." In Antiviral Drug Strategies, 181–208. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527635955.ch8.

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Conference papers on the topic "Phosphite esters"

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'Adawiyah Norzali, Nor Rabbi'atul, Khairiah Haji Badri, and Ishak Ahmad. "Physicochemical properties of phosphate ester from palm kernel oil." In THE 2013 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2013 Postgraduate Colloquium. AIP Publishing LLC, 2013. http://dx.doi.org/10.1063/1.4858767.

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Valiakhmetova, A., K. S. Sorbie, M. M. Jordan, and L. S. Boak. "Novel Studies on Precipitated Phosphate Ester Scale Inhibitors for Precipitation Squeeze Application." In SPE International Conference on Oilfield Chemistry. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/184511-ms.

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BAO, XIAOLING, ZHANGFA TONG, YOUQUAN ZHANG, YUCAI HE, and GUANGTAO WEI. "PREPARATION OF HIGH DS CASSAVA STARCH PHOSPHATE ESTER UNDER THE DRY PROCESS." In Proceedings of the 4th International Conference. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702623_0193.

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Goode, M. J., W. D. Phillips, and D. Placek. "Triaryl Phosphate Ester Hydraulic Fluids - A Reassessment of Their Toxicity and Environmental Behaviour." In International Off-Highway & Powerplant Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1998. http://dx.doi.org/10.4271/982004.

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Jordan, Myles, Kim Vikshåland, and Michael Johnston. "Synergistic Scale Inhibitor Blends Provide Enhanced Carbonate Scale Management- Laboratory to Field." In SPE International Conference on Oilfield Chemistry. SPE, 2023. http://dx.doi.org/10.2118/213843-ms.

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Abstract Control of inorganic sulphate and carbonate scales with polymer, phosphonate and phosphate ester scale inhibitors is well established within the oilfield service industry. Less well understood is the potential for synergistic interactions with blends of polymers/phosphonates/phosphate esters to give reduced treatment rates, lower chemical discharge volumes and potentially lower treatment cost specifically for carbonate scale control. In this paper selection and field trial application of such a synergistic blend is presented to control severe scaling within produced fluid heaters on a North Sea platform. Dynamic scale loop (DSL) tests were carried out to evaluate inhibition of a range of single component inhibitors before blends of these chemicals including biopolymer/phosphonate and carboxylic acid functionalized polymer/phosphonate were evaluated to try to reduce the inhibitor concentration required to control both calcium carbonate (saturation ratio, SR 550, mass 1100mg/l) and barium sulphate (SR 55, mass 450mg/l) scale formation. For this challenging carbonate (milder sulphate) scale environment at high temperature (105°C), it was observed that a blend of a polymer (carboxylic acid functionalized polymer) and currently applied low molecular weight phosphonate was more effective than either of the components by themselves, suggesting synergistic interaction. Results from the initial field trial of the synergistic blend are presented with monitoring methods outlined to confirm that the formulation is as effective as the laboratory evaluated tests suggested. The initial trial started at the incumbent products injection rate for 1 week with differential pressure across the production and test heaters carefully trended (along with fluid flow rate and fluid heating performance) to confirm scale control prior to a 20% reduction in treatment rate being applied for 1 week with a further reduction of 40% of the incumbent being applied for another 7 days prior to the incumbent chemical being reinstated to allow review of the trial formulations performance. Along with differential pressure trending scaling ions, suspended solids assessment via environmental scanning electron microscope (ESEM) and measurement of inhibitor concentration within the produced water was carried out to ensure scale control was effective. The current regulatory challenges with REACH (registration, evaluation, authorization and restriction of chemicals) mean that the methods outlined in this study offer the potential to reduce chemical treatment rate, cost and environmental impact by evaluating the synergistic interaction of the current range of commercially available environmentally suitable scale inhibitors and therefore eliminating the very high registration costs/ time delays to the market associated with new inhibitor molecule development.
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Nath, Niharika, Ravinder Kodela, Daniel Boring, James Crowell, and Khosrow Kashfi. "Abstract A23: Expression profile of genes altered by ester-protected hydroxybenzyl phosphates (EHBP) in T-leukemia cells." In Abstracts: Frontiers in Cancer Prevention Research 2008. American Association for Cancer Research, 2008. http://dx.doi.org/10.1158/1940-6207.prev-08-a23.

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Molina, Luis, y. Vedia, and Eduardo G. Lapetina. "ENZYMES THAT DEPHOSPHORYLATE INOSITOL PHOSPHATES IN HUMAN PLATELETS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644522.

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Inositol trisphosphate (IP3) is now recognized as a second messenger molecule that mobilizes Ca2+ from intracellular stores to the cytosol. The persistence of the action of IP3 depends on the specific phosphatase that converts IP3 to inositol bisphosphate (IP2). The activation of IP3 phosphatase is important in terminating the Ca2+ signal in stimulated cells. In platelets it has previously been shown that this enzyme is regulated by protein kinase C since it is stimulated by phorbol esters and 1,2-diacylglycerol (Molina y Vedia, L., and Lapetina, E.G. J. Biol Chem. 261, 10493-10495, 1986) and the cytosolic platelet enzyme is phosphorylated by brain protein kinase C, resulting in a 4-fold increase in IP3 phosphatase activity (Connolly, T. M., Lawing, W.J., Jr., and Majerus, P.W., Cell, 46, 951-958, 1986). We have studied the subcellular distribution of the phosphatases that hydrolyze IP3, IP2 and inositol monophosphate (IP) in human platelets. Three subcellular fractions were obtained from human platelets lysed by freezing and thawing: a cytosolic fraction, a membrane fraction and a mixed particulate fraction containing granules, mitochondria and membranes. These fractions have been characterized by specific marker enzymes. The highest specific activity of IP3 -phosphatase is associated with the membrane fraction and accounts for about 10-15% of the total activity. The mixed particulate fraction has 35-40% of the activity while about 50% is cytosolic. The Km of the membrane fraction enzyme is 100 μM. This enzyme is extracted by 1M NaCl and hydrodynamic studies revealed a molecular weight of 50 kDa. The NaCl extracted-enzyme has been further purified by hydrophobic and gel filtration chromatographies. This activity does not hydrolyses IP but hydrolyse IP2 at a lower rate. The enzyme that hydrolyses IP to inositol is confined to the cytosolic fraction, has a Km of 130 μM, is inhibited by Li+, and hydrodynamic studies show an apparent molecular weight of 91 kDa.
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Kodela, Ravinder, Steven Rokita, Daniel Boring, James Crowell, and Khosrow Kashfi. "Abstract B109: Bioactivated chemotherapeutic agents based on ester-protected hydroxybenzyl phosphates (EHBP) for reversible alkylation of cellular nucleophiles." In Abstracts: Frontiers in Cancer Prevention Research 2008. American Association for Cancer Research, 2008. http://dx.doi.org/10.1158/1940-6207.prev-08-b109.

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de Chaffov de Courcelles, D., F. De Clerck, and P. Roevens. "EVALUATION OF THE PROPOSED FUNCTIONS OF PROTEIN KINASE C IN PLATELET SIGNAL TRANSDUCTION BY THE USE OF A DIACYLGLYCEROL KINASE INHIBITOR." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644632.

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Protein kinase C is suggested to play a major role in propagation as well as in termination of excitatory signal transduction in the platelet. Most of its properties were discovered by the use of synthetic diacylglycerol analogs or phorbol esters that directly stimulate protein kinase C. It is, however, unknown to what extent activation of the protein kinase C by these exogenously added compounds can be compared to that after receptor activation. To evaluate the role of protein kinase C in excitatory signal transduction, we transiently elevated the endogenous diacylglycerol level after receptor activation by the use of a diacylglycerol kinase inhibitor (R 59 949). On addition of the agonist vasopressin to platelets prelabeled with [32P] orthophosphate, 32P-phosphatidic acid (PA) formation was inhibited by R 59 949 in a dose-dependent manner (IC50 α 10−6 M). Vasopressin induced formation of 32P-phosphatidylinositol-4’-phosphate (PIP) and the phosphorylation of the 40 k Da protein (major substrate of the protein kinase C) were increased in the presence of the compound. In platelets prelabeled with [3H]-inositol, the agonist-induced formation of all the water-soluble inositol phosphates was inhibited in the presence of the diacylglycerol kinase inhibitor and Li+. Vasopressin induced increase in intracellular Ca2+ was lower in the presence of R 59 949. The platelet shape change induced by a threshold concentration of vasopressin was reduced by the compound. By contrast, the rate and the maximum of the first-wave aggregation was enhanced in the presence of R 59 949.These data evidence that protein kinase C, stimulated by endogenously generated diacylglycerol after receptor activation, plays a major inhibitory role on the primary steps of signal transduction since its activation reduces i) phospholipase C activity and ii) the increase in intracellular Ca2+ and the concomitant shape change reaction. The inhibitory role of protein kinase C on signal transduction is largely independent of its stimulatory role on platelet aggregation. Our data further confirm that stimulation of protein kinase C induces the formation of PIP but questions the role of the kinase in the breakdown process of inositoltrisphosphate.
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Ellappan, Sivakumar, poddu arun bhargav Teja, Vetrivelkumar K, and Silambarasan Rajendran. "CFD Simulation of a Lithium-Ion Battery Cooling System for Electricvehicles Using a Phase-Change Material and Heat Pipes." In International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2020. http://dx.doi.org/10.4271/2020-28-0520.

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<div class="section abstract"><div class="htmlview paragraph">In order to ensure the safety and improve the performance, the maximum operating temperature and local temperature difference of batteries must be maintained in an appropriate range. The effect of temperature on the capacity fade and aging are simply investigated. Lithium-ion power battery has gotten one of the principle power hotspots for electric vehicles and mixture electric vehicles due to prevalent execution contrasted and other force sources. In this paper, the displaying in CREO parametric programming and examination done in ANSYS. The model planned with various sort of warmth pipe shapes and breaks down the warmth pipe with various mass stream gulfs (30&amp; 50L/min). In this paper CFD examination to decide the weight, speed, heat move coefficient, mass stream rate and warmth move rate for the various structures of warmth pipe and diverse mass stream bays. In this theory the warm investigation to decide the temperature appropriation and warmth transition for two sorts of stage change materials (RT50 and Li Fe PO4). The consequences of the CFD investigation think about the warmth move pace of the three various types of the cooling framework structure Such as straight sort, box type and curve type heat pipes. By watching the CFD investigation results, the mass stream rate, heat move rate, heat move coefficient esteems are expanded by expanding the mass stream bays and warmth move rate more at box type heat pipes. By watching the warm examination results, the warmth transition esteem is more for lithium particle phosphate stage change material than RT50 stage change material at box type heat pipes.</div></div>
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Reports on the topic "Phosphite esters"

1

Czarnik, Anthony W. Precomplexation and Activation of Carboxylate and Phosphate Esters. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada247778.

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Czarnik, Anthony W. Precomplexation and Activation of Carboxylate and Phosphate Esters,. Fort Belvoir, VA: Defense Technical Information Center, May 1992. http://dx.doi.org/10.21236/ada251846.

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Czarnik, Anthony W. Synthetic Catalysts that Hydrolyze Phosphate and Carboxylate Esters. Fort Belvoir, VA: Defense Technical Information Center, September 1992. http://dx.doi.org/10.21236/ada256420.

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Deckman, Douglas E., Douglas E. Deckman, Stephen M. Hsu, and E. Erwin Klaus. Vapor phase deposition studies of phosphate esters on metal and ceramic surfaces. Gaithersburg, MD: National Institute of Standards and Technology, 1988. http://dx.doi.org/10.6028/nist.sp.754.

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Carre, D. J., and P. A. Bertrand. Modeling and Measurement of Aryl Phosphate Ester Vapor Pressures at 50 Deg. C. Fort Belvoir, VA: Defense Technical Information Center, September 1998. http://dx.doi.org/10.21236/ada357652.

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Quin, Louis D. Generation of Phosphorous Ester, Phosphorus Amide, and Phosphine Derivatives of Low Coordination Number. Fort Belvoir, VA: Defense Technical Information Center, October 1986. http://dx.doi.org/10.21236/ada175747.

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Quin, Louis D. Generation of Phosphorus Ester, Phosphorus Amide, and Phosphine Derivatives of Low Coordination Number. Fort Belvoir, VA: Defense Technical Information Center, December 1989. http://dx.doi.org/10.21236/ada216977.

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