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Showing 1 to 9 of 9 for “"Cyclic ketones"”.
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Investigation of Absolute Photoionization Cross Sections of Cyclic Ketones, Low Temperature Combustion of Propargylamine by Synchrotron Photoionization Mass Spectrometry, and Computational Study of Hypersalts
<p>The presented research was carried out at the University of San Francisco. Measurements of absolute photoionization cross sections of both cyclopentanone and cyclohexanone, as well as the Cl-initiated oxidation of propargylamine were completed through the use of a multiplexed photoionization …
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Alpha-Oxygenation by Acylation-Rearrangement of Nitrones
… for the (alpha)-oxygenation of aldehydes and cyclic ketones via (alpha)-acyloxy imines. The reaction apparently proceeds by initial acylation of the nitrone oxygen, proton removal, and {3,3}-sigmatropic rearrangement of the resulting N-vinyl-O-acylhydroxylamine. Oxygen-18 labeling studies in …
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The design and synthesis of polymeric assemblies for materials applications : chemosensing, liquid crystal alignment and block copolymers
… new transduction mechanism for the detection of cyclic ketones - molecules that are found in plasticized explosives. We discuss the synthesis of a new reporter dye bearing a receptor for cyclic ketones that is capable of undergoing efficient energy transfer with conjugated polymers. We further …
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DEVELOPMENT OF SYNTHETIC METHODOLOGIES TOWARDS CYCLIC HYDROXAMIC ACID-BASED NATURAL PRODUCTS
… develop new synthetic methodology towards making cyclic hydroxamic acids in a stereoselective and regioselective fashion. Basic decomposition of Piloty's acid transforms cyclic ketones (mainly four and five membered) into ring-expanded cyclic hydroxamic acids in 20-69% yield (Scheme 1). …
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Copper-catalyzed conjugate reduction
… conjugate reduction of a,- unsaturated cyclic ketones was generated upon combination of catalytic amounts of CuCl, NaOt-Bu, and a chiral bis-phosphine with poly(methylhydrosiloxane) (PMHS) as the stoichiometric reductant. In this process, chiral 3-alkylcyclopentanones were isolated in …
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PHOTOCHEMICAL AND TITANIUM (II) MEDIATED METHODS FOR THE SYNTHESIS OF COMPLEX MOLECULAR SCAFFOLDS
… carbon-carbon bond forming steps. The bridged tricyclic intermediates would violate Bredt’s Rule and prevent the final carbon-carbon bond formation. This transformation can access a wealth of cyclic amino-ketones from olefin-tethered lactams. In addition, appropriate selection of an electron …
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Novel Photochemical Methodologies for Diversity Oriented Synthesis and Screening of Combinatorial Libraries
… accessible diverse starting materials into polycyclic aldehydes and their (hemi)acetals decorated by various pendants. The two step sequence, involving the <em>Diels-Alder</em> addition of heterocyclic chalcones and other benzoyl ethylenes to a variety of dienes, followed by the …
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Carbon monoxide-driven reductive organic transformations and precious metals recycling
… groups e.g. activated alkenes, aldehydes, and ketones. We demonstrated the ability of the WGSR to drive the reductive alkylation of several classes of activated methylene compounds at room temperature. Under catalysis by rhodium trichloride (2–3 mol %), carbon monoxide (10 bar), water (2–50 …