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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Aryloxy tungsten-based classical catalytic systems and group 14 metal-containing dienes in acyclic diene metathesis polymerization /

Gómez, Fernando José, January 2000 (has links) (PDF)
Thesis (Ph. D.)--University of Florida, 2000. / Printout. Vita. Includes bibliographical references (leaves 150-156). Also available on the World Wide Web; PDF reader required.
12

Preparation and reactions of partially fluorinated dienes

Patton, Jerry Ronald, January 1980 (has links)
Thesis (Ph. D.)--University of Florida, 1980. / Description based on print version record. Typescript. Vita. Includes bibliographical references (leaves 190-192).
13

Annulations leading to bicyclic dienes : Diels-Alder reactions of (some of) the dienes and dolastane diterpenoid syntheses

Friesen, Richard William January 1988 (has links)
The preparation of bicyclic dienes of the general structures (72), (82), (83) and (162) is described. These materials have been prepared via a novel annulation sequence involving (a) the alkylation of various carbonyl containing substances with the donor acceptor reagents (43), (44), (108)-(114) and (154), (b) the conversion of the alkylation products into the enol triflates, and (c) the palladium(O) catalyzed intramolecular coupling of the enol triflate-vinylstannane moieties via either a "one" or "two pot" process. The Diels-Alder reactions of the "parent" bicyclic diene (75), the cisoid cis diene (145) and the cisoid trans diene (146) are described. Four basic questions regarding the face selectivity, regioselectivity, stereoselectivity and comparative reactivity of the dienes in the formation of the Diels-Alder adducts of general structure (174) are addressed. The annulation sequences described above have been applied to the first total syntheses of the dolastane diterpenoids (±)-(14S)-dolasta-1(15),7,9-trien-14-ol (239) and (±)-amijitrienol (242). Thus, the substituted cycloheptanone (262), prepared in seven steps from the commercially available material (261), was converted via a series of transformations, including the newly developed annulation process, into the bicyclic diene (264). Introduction of the two appendages to (264) proceeded stereoselectively to provide the keto vinylstannane (265). Ring closure was effected with the desired stereochemistry to yield (±)-(239). A reduction, deprotection sequence afforded the ketone (249) from the diene ketal (263). A series of three steps involving an aldol condensation, Swern oxidation and stereoselective methylation provided the diketone (290). Chemo- and stereoselective reduction of (290) followed by protection of the alcohol moiety yielded the silyl ether (303). Cyclization, according to the methodology described herein, and deprotection of the silyl ether moiety produced (±)-(242). [Formula Omitted] / Science, Faculty of / Chemistry, Department of / Graduate
14

Synthetic studies on marine natural products : I. Stereoselective synthesis of E,Z-1,3-Dienes by tandem nucleophilic addition to a dienylphosphonium salt followed by Wittig reaction. II. Synthesis of cyclopropyl oxylipins by a cation mediated carbocyclization

Jensen, Mark S. 18 October 1994 (has links)
Graduation date: 1995
15

Synthesis of silyloxyacrolein for [4+3] cycloaddition and preparation of carbonate closomer

Liu, Yuan, Hawthorne, M. Frederick. Harmata, Michael, January 2008 (has links)
The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract, appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on month day year) Thesis advisor: Dr. M. Frederick Hawthorne, Dr. Michael Harmata. Vita. Includes bibliographical references.
16

Facial selectivity in the Diels-Alder reaction of some inverse electron demand 1,3-cyclopentadienes and a tandem-ene approach to the synthesis of a linear triquinane /

Burry, Lori Carolyn, January 1998 (has links)
Thesis (Ph. D.), Memorial University of Newfoundland, 1998. / Bibliography: leaves 197-205.
17

Exploration of the inverse-electron-demand Diels-Alder (IEDDA) reaction. Rapid access to benzocoumarins via IEDDA-driven domino reactions of coumarin-fused electron-deficient dienes with electron-rich dienophiles /

Pottie, Ian R., January 2002 (has links)
Thesis (Ph.D.)--Memorial University of Newfoundland, 2003. / Bibliography: leaf 375.
18

Dienes as a new class of substrate for asymmetric catalysis : hydrogenation and hydroboration

Nguyen, Bao Ngoc January 2007 (has links)
No description available.
19

Studies in Fluorine Chemistry: 13C NMR Investigation of SF5/SO2F Fluorinated Systems

Choi, Yoon S. 04 August 1994 (has links)
The purpose of this thesis was two fold: (i) The synthesis and characterization of SF5 containing dienes. (ii) The characterization of hydro/fluorocarbon compounds containing SF5/S02F groups via their 13C NMR spectra. A new SF5CH2CHBrCH2CF=CF2 was prepared and characterized as a precursor to new dielectric polymers. This new adduct was made from the reaction of pentafluorothio bromide with l,l,2-trifluoro-1,4-pentadiene. A SF5-diene was prepared from the reaction of pentafluorothio chloride with acetylene. This reaction involves a radical addition mechanism. The SF5 group is bonded to the carbon atom carrying the most hydrogens. SF5 - dienes are capable of undergoing different reactions, such as polymerization. Fluorocarbon sulfonyl fluorides (RS02F), which have been synthesized in our lab, were characterized by their 13C NMR spectra. The 13C NMR data of these sulfonyl fluorides show chemical shift values for the methyl and methylene groups next to a fluoroalkyl sulfonyl fluoride group in the 52.8-65.7 ppm range. The spectra showed that the inductive effect of electronegative substituents has a major influence on the 1Jc-F and 1Jc-H coupling. Infrared, 1H, 19F and 13C nuclear magnetic resonance and mass spectra are presented to support the assigned structure for the new compounds, SF5CH=CHCH=CHC1 and SF5CH2CHBrCH2CF=CF2.
20

The synthesis of an electron deficient diene and progress towards the first total synthesis of jatrorrhizine /

Swinamer, Alan, January 1997 (has links)
Thesis (M. Sc.), Memorial University of Newfoundland, 1998. / Bibliography: leaves 135-151.

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