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Showing 1 to 20 of 2288 for “"Asymmetric"”.
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Asymmetric synthesis involving silicon
… silylated diols (17 pairs) have been prepared by asymmetric dihydroxylation of the corresponding allyl and vinylsilanes using Sharpless catalysts. Chiral analysis of these silyl diols was carried out by <sup>1</sup>H NMR methods in the presence of Eu(hfc)<sub>3</sub>. Enantiomeric purity of some …
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Essays on Asymmetric Information
My dissertation analyzes the credible communication of seller information to buyers. My first essay, "New and Improved?", considers firms' incentives to introduce new product versions and the corresponding beliefs of consumers about such products' quality when they have no direct information about …
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Scheduling on Asymmetric Architectures
… the dimensions and degrees of parallelism on the asymmetric parallel platforms. The schedulers address the problem of mapping application-specific concurrency to an architecture with multiple hardware layers of parallelism, without requiring programmer intervention or sophisticated compiler …
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Optimal Warranties Under Asymmetric Information
When firms have private information on the quality of their own products, the warranty offered by a firm can convey information about product quality. Warranties also provide consumers with insurance should the product fail. Consumers face a trade-off: the desired insurance may not provide firms …
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Trade Networks under Asymmetric Information
… to a trader through a network. We introduce asymmetric information on the valuation of goods by sellers and buyers. We deal with a two-stage game with incomplete information. The trader tries to maximize his profit. In Chapter 1, we analyze even network structures with one seller-one …
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Asymmetric Catalysis in Polymersome Nanoreactors
Contains fulltext : 140662.pdf (Publisher’s version ) (Open Access)
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Approaches to Asymmetric Click Chemistry
… 'click' is an invaluable synthetic tool, with asymmetric examples are beginning to emerge. However no rugged asymmetric CuAAC system has to date been discovered. This project aims to develop and utilize asymmetric CuAAC reactions in the synthesis of natural product mimicking macrocycles and …
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Asymmetric synthesis of novel anthracyclinones
… prepared by an ene cyclisation and subjected to asymmetric dihydroxylation (AD). The products from the AD reactions are of considerable biological interest and have been characterized. Their stereochemistry has been assigned by 1H nmr comparisons with the parent diphenols, which have resulted in …
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Asymmetric intramolecular Diels-Alder reactions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1986.
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Exploitative friendships : manipulating asymmetric alliances
… variation in alliance behavior in the context of asymmetric international security alliances. When weak states ally with stronger states - i.e. states with significantly greater military capabilities - what explains differences in the junior party's approach to the alliance relationship? Why do …
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Nickel-catalyzed asymmetric cross-couplings of secondary allylic chlorides and planar-chiral compounds in asymmetric synthesis
In Part I, nickel-catalyzed asymmetric carbon-carbon bond-forming reactions are described. A nickel/Pybox system effectively catalyzes regio- and enantioselective cross-couplings between racemic secondary allylic chlorides and readily available alkylzinc halides. This method is applied to generate …
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Asymmetric Strategies and Asymmetric Threats: A Structural-realist Critique of Drone Strikes in Pakistan, 2004-2014
… The unique security dilemma presented by the asymmetrical threat of terrorism and the asymmetrical response of drone strikes necessitates the continued evolution of neorealism as an IR theory.
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Asymmetric induction in solid state photochemistry
… Photolysis of the chiral crystals resulted in asymmetric induction in the products. The regioselectivity of the photorearrangements of the starting materials prior to salt formation was studied in solution as well as in the solid state. In addition, the photochemistry of the methyl and ethyl …
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The application of organocatalytic Asymmetric Epoxidation
… of target natural product synthesis, catalytic asymmetric synthesis has become a vital tool to obtain enantiomerically pure compounds, and is often used in the synthesis of natural products as a key step.1 For example, the asymmetric dihydroxylation was used in synthesis of gibberellic acid …
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Analyses of electronic asymmetric rotor spectra
<p>Seven type C bands of the 3700 A Ã<sup>1</sup>B<sub>1</sub>-X̃<sup>1</sup>A<sub>1</sub> system of pyridazine (1,2-diazine) have been analyzed by rotational band contour analysis. The rotational constants, in either the upper or lower state, of each band were adjusted until the simulated contour …
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