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Showing 1 to 20 of 57 for “"Sodium borohydride"”.
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Mechanisms In the Water Vapor Hydrolysis of Sodium Borohydride
… hydrogen on demand. Chemical hydrides such as sodium borohydride (NaBH<sub>4</sub>), release hydrogen via exothermic reaction with water as follows: NaBH<sub>4</sub> + (2+x) H<sub>2</sub>O → 4H<sub>2</sub> + NaBO<sub>2</sub>·xH<sub>2</sub>O + heat. The gravimetric and volumetric …
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The reduction of organic halides and diazonium salts with sodium borohydride
Sodium borohydride in aqueous dimethylsulfoxide has been shown to be a good reducing agent for converting certain activated aromatic halo-compounds to their corresponding dehalogenated products. The order for ease of removal of the halogen is I>Br>Cl. The activating groups are those that are …
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Modeling, Analysis and Design of a Regenerative Direct Sodium Borohydride Fuel Cell System
Made available in DSpace on 2017-07-06T18:49:05Z (GMT). No. of bitstreams: 3 Kopec_Grant_M_MS.pdf: 1152173 bytes, checksum: 5f5bc6bf0622231f46fd2c771854a96a (MD5) Kopec_Grant_M_MS_ABS.pdf: 7761 bytes, checksum: f26337585d3b36b9395648a055f107c8 (MD5) license.txt: 4813 bytes, checksum: …
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The sodium borohydride reduction of organic halides and related derivatives in aprotic solvents
Sodium borohydride reduces alkyl halides and their related tosylate derivatives in the order primary > secondary > tertiary, while the relative order of leaving-group ability is Ts⁻ ≥ I⁻ > Br⁻ > > Cl⁻. The yields obtained ranged from 90-100% for most simple, primary and secondary iodides, bromides, …
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Increasing fuel cell run time by preventing precipitation of reactants or products in direct sodium borohydride fuel cell
… work aims to maximize usable run time of direct sodium borohydride / hydrogen peroxide (NaBH4 / H2O2 ) proton exchange membrane fuel cell, given a fixed volume of fuel solution . In the fuel cell being developed here at the University of Illinois, there is a need to manage water flow so as to …
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An investigation into the synthesis and characterisation of metal borohydrides for hydrogen storage
… and volumetric hydrogen storage capacities, borohydride compounds are being investigated for their potential use as hydrogen storage media. A study has been made into the mechanical milling of metal chlorides with sodium borohydride to try to form homoleptic borohydrides. Mechanical milling …
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Photochemical reactions of tetraorganoborate salts: Electron transfer-mediated photoreductions and alkylations and di-pi-borate rearrangements
The photochemical reaction of sodium borohydride and methyltriphenylborate with halo-substituted cyanonaphthalenes has been studied. The reaction leads to photo-dehalogenation in high yield. Sodium borohydride was also found to react photochemically with dicyanonaphthalene, leading to reduction …
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Bicyclic Heterocyclic Systems Derived from 1, 3, 4-Trisubstituted Pyridines
… of the appropriate pyridinium iodides with sodium borohydride. The reduction of 3,4-dimethoxycarbonyl-1-methyl pyridinium iodide by sodium borohydride gives the expected tetrahydro derivative and 3,4-dimethoxycarbonyl-1-methylpyrid-6-one; the pyridone was also prepared by oxidation of the …
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Synthesis and applications of silver and palladium nano metal foams
… process were obtained using either hydrazine or sodium borohydride as the acceptable reducing agent for this redox reaction. Palladium NMFs were synthesized in the same way in the condition of 150 °C with either hydrazine or sodium borohydride as the reducing agent. Silver NMFs were applied in …
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Development of a Hydrogen Producing Thermal Control for Chemical Hydrogen Storage
… was created to allow hydrogen production from a sodium borohydride packed bed reactor and the metal hydride. Additionally, a custom built pressure-composition-temperature apparatus was built to record the amount of hydrogen desorption from the metal hydride while isolating the metal from …
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Synthesis and characterization of nickel, palladium and chromium complexes as olefin oligomerization catalysts
… obtained by reduction of the imine bonds using sodium borohydride. All compounds were fully characterized using spectroscopic and analytical techniques, including melting point, ¹H, ¹³C, and ³¹P NMR, IR spectroscopy, MS, and elemental analysis. These ligands (L) were reacted with appropriate …
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Synthesis of Labeled 3-Hydroxyproline and Biosynthesis of the Dehydroproline Moiety of Virginiamycin M₁
… lead tetraacetate. Reduction of the imine with sodium borohydride gave predominately (R,S)-[caboxyl-¹⁴C]-cis-3-acetoxyproline which was hydrolyzed with hydrochloric acid and purified by ion-exchange chromatography and recrystallization. In order to determine if cis-3-hydroxyproline is a …
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Analysis of Hopanoids From Three Psychrophilic Marine Bacterial Strains
… with a solution of periodic acid followed by sodium borohydride reduction in order to convert the complex hopanoids to their primary alcohols. Preparative thin layer chromatography (TLC) was used to fractionate the treated extract. The treated hopanoids, recovered as TLC bands, were …
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Synthesis of Chiral Surfactants for Enantioselective Organic Synthesis.
… in a standard reduction of 2-pentanone with sodium borohydride to yield (R)- and (S)-2-pentanol <b>(3)</b> (4gm, 25%). The resulting alcohol was then esterified with (2S)-methylbutyric acid with iodine as the catalyst and the ester was characterized.</p>
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Pyridoxylation of the essential lysines in the heparin-binding site of bovine platelet factor 4.
… pyridoxal 5$\sp\prime$-phosphate and reduced by sodium borohydride. Three moles of lysine residues are labelled per mole of platelet factor 4. This resulting modified protein exhibits a loss of affinity for heparin-agarose affinity columns. The identities of the three essential lysines have been …
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Predictive Modelling of the Growth of Nanoscale Silver Particles: Verification of an Aggregative Growth Mechanism
… from the reduction of silver salt using sodium borohydride. Within seconds of mixing silver salt solution with borohydride, >95% of the ionic silver is consumed, leaving essentially no silver for classical growth by molecular addition. These particles are stabilized by the charge …
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