A5064073978- Asymmetric Synthesis and Catalysis
- Synthesis and Catalytic Reactions
- Fluorine in Organic Chemistry
- Synthetic Organic Chemistry Methods
- Chemical Synthesis and Reactions
- Supercapacitor Materials and Fabrication
- Cyclopropane Reaction Mechanisms
- Marine Sponges and Natural Products
- Chemical Synthesis and Analysis
- Advanced Battery Materials and Technologies
- Synthesis and Reactions of Organic Compounds
- Electric and Hybrid Vehicle Technologies
- Conducting polymers and applications
- Fuel Cells and Related Materials
- Bacterial Genetics and Biotechnology
- Carbohydrate Chemistry and Synthesis
- Advanced Sensor and Energy Harvesting Materials
- Marine Toxins and Detection Methods
- Chemical Reaction Mechanisms
- Synthesis and properties of polymers
- Asymmetric Hydrogenation and Catalysis
- Legume Nitrogen Fixing Symbiosis
- Catalytic Alkyne Reactions
- Sulfur-Based Synthesis Techniques
- Traditional and Medicinal Uses of Annonaceae
Northern Arizona University
2008-2018
Los Alamos National Laboratory
2008
National University of Singapore
2008
Fort Lewis College
2005-2007
Oregon State University
2001-2005
University of Utah
1998-2004
Oberlin College
1993-1994
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHighly Diastereoselective Cycloisomerization of Acyclic Trienones. The Interrupted Nazarov ReactionJohn A. Bender, Alan E. Blize, Cindy C. Browder, Sören Giese, and F. G. WestView Author Information Department Chemistry, University Utah, Salt Lake City, Utah 84112 Cite this: J. Org. Chem. 1998, 63, 8, 2430–2431Publication Date (Web):March 24, 1998Publication History Received23 February 1998Published online24 March inissue 1 April...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTotal Synthesis of the Marine Toxin Polycavernoside A via Selective Macrolactonization a Trihydroxy Carboxylic AcidJames D. White, Paul R. Blakemore, Cindy C. Browder, Jian Hong, Christopher M. Lincoln, Pavel A. Nagornyy, Lonnie Robarge, and Duncan J. WardropView Author Information Department Chemistry, Oregon State University Corvallis, 97331-4003 Cite this: Am. Chem. Soc. 2001, 123, 35, 8593–8595Publication Date (Web):August 10,...
Two approaches to the synthesis of aglycon 120 polycavernoside A (1) were developed, only one which was completed. The successful "second-generation" route assembled seco acids 102 and 106 via Nozaki−Hiyama−Kishi coupling aldehyde 70, prepared from methyl (S)-3-hydroxy-2-methylpropionate (72) (S)-pantolactone (73), with vinyl bromide 71. latter obtained a sequence commenced silyl ether 24 3-hydroxypropionaldehyde entailed cyclization (Z)-ζ-hydroxy-α,β-unsaturated ester 82. Regioselective...
1,4-Dien-3-ones bearing pendant arylethyl side chains were readily prepared from substituted dihydrocinnamaldehydes. When treated with TiCl4 at low temperature, these compounds underwent domino cyclization to give benzohydrindenones in near-quantitative yield and complete diastereoselectivity.
Thermally driven artificial muscles, such as twisted polymer actuators (TPAs), are a promising new development in the field of smart materials. TPAs have potential applications advanced prostheses, robotics, or any operation that produces excess heat and requires actuation. The theory explaining actuation phenomenon is based on anisotropic thermal expansion drawn polymers, which expand radially contract axially under loading. When monofilaments twisted, these properties remain relatively...
The biosynthesis of the 3,4-dihydroxybenzoate moieties siderophore petrobactin, produced by B. anthracis str. Sterne, was probed isotopic feeding experiments in iron-deficient media with a mixture unlabeled and d-[13C6]glucose at ratio 5:1 (w/w). After isolation labeled siderophore, analysis isotopomers conducted via one-dimensional 1H 13C NMR spectroscopy, as well 13C−13C DQFCOSY spectroscopy. Isotopic enrichment coupling constants aromatic ring isolated suggested predominant route for...
The utility of 2-isoxazolines (Δ2-isoxazolines, 4,5-dihydroisoxazoles) in the preparation natural products and other compounds medicinal materials interest is growing because 2-isoxazoline serves both as a desirable functional group versatile synthetic intermediate. Nitrile oxide cycloaddition (NOC) to alkenes most common method for 2- isoxazolines, intramolecular version this reaction provides powerful entry into complex polycyclic systems. This review first compile studies on nitrile...
1,4-Dien-3-ones substituted with pendant arylethyl side chains attached at C-1 were readily prepared from dihydrocinnamaldehydes. Treatment TiCl 4 low temperature effected domino Nazarov electrocyclization arene trapping within 5 min to give racemic benzohydrindenones in near-quantitative yield and complete diastereoselectivity.Key words: process, electrophilic aromatic substitution, Lewis acid, cyclization.
Treatment of trienones 1a-g with BF3 · OEt2 at - 78 °C followed by warming effected Nazarov electrocyclization 6-endo cation-olefin cyclization. The resulting tertiary carbocations underwent elimination to give olefinic products 2, intramolecular hydride transfer furnish enones 3 and/or + 2 ring-closure providing tricyclic 4. Use TiCl4 in place led most cases a mixture and chloride-trapping 7.
The paper presents electrical and mechanical properties of structural supercapacitors discusses limitations associated with the approach taken for evaluation. characterized in this work had electrodes made carbon fiber weave, separator several cellulose based products, solid electrolyte as PEGDGE polymer blend. reported include capacitance leakage resistance; former was measured using cyclic voltammetry. Mechanical have been evaluated thorough tensile three point bending tests performed on...
The interest in developing multifunctional materials has greatly increased the last decade. Power storage composites are just one class of that potential to lead significant size and weight reduction. Many electronic devices (i.e. laptops, cellphones, iPods, etc.) mechanical systems require or generate electrical power during operation (i.e., hybrid fully electric cars, wind turbines, airplanes, could benefit substantially from these materials. While several types structural have been...
Abstract An inexpensive and mild method for the formation of dimethyl acetals from corresponding aldehydes is achieved using hydroxylamine methanol under neutral conditions at room temperature. Notably, reaction selective in presence ketones, rendering this an example a chemoselective acetalization. For saturated, sterically accessible aldehydes, catalytic amounts may be employed to attain acetal as sole product good excellent yield. Unsaturated hindered required stoichiometric but provided...
The paper presents results associated with the electro-mechanical characterization of a composite material power storage capability, identified throughout as structural supercapacitor. supercapacitor uses electrodes made carbon fiber weave, separator Celgard 3501, and solid PEG-based polymer blend electrolyte. To be viable supercapacitor, has to have good mechanical storage/electrical properties. literature in this area is inconsistent on which electrical properties are evaluated, how those...
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An unusual synthesis of isoxazoles from α,β-unsaturated ketoximes is reported. Using very inexpensive reagents, are isolated in good yields. Notably, a mixture E and Z oxime isomers employed. Initial studies indicate the oxidative cyclization reaction does not proceed via radical route; copper insertion/elimation route proposed. Keywords: Isoxazole, cyclization, copper-mediated, antiinflammatory, pharmaceuticals, antibiotic, ketoxime, anhydrous, Beckmann rearrangement, olefin-tethered substrate
The paper presents results associated with the development of a carbon fiber weave based composite material power storage capability. In simplest layup, coupons (commonly 75mm by 75mm) are made in single layer configuration providing modest gains terms multifunctionality, i.e. capability is not significant compared to overall loss mechanical strength material, due changes formulation dictated added functionality. However, multifunctional performance can be enhanced stacking multiple on top...
Abstract An unusual synthesis of isoxazoles from α,β‐unsaturated ketoximes (E/Z mixture) is reported.