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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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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.
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Showing 261 to 270 of 2974 (0.029 seconds)| 261 |
Some sigmatropic rearrangements of polyfluoroaromatic and heteroaromatic compoundsFerguson, John Alasdair Kerr Jamie January 1986 (has links)
This Thesis describes some [3,3] and [2,3] -sigmatropic rearrangements that can occur in a variety of polyfluoroaromatic and -heteroaromatic compounds. The presence of fluorine on the aromatic moiety precludes the normal rearomatization process. The work is conveniently divided into two parts. Part A concerns the preparation and thermal (Claisen) rearrangement of derivatives of allyl 5-fluoropyrimidin-4-yl ether. These rearrange upon thermolysis to give isomers in which the terminus for the migration of the allyl group is N-3, provided that there is no preceding reaction which localises a double- bond between C-4 and C-5 - in which case C-5 is the migration terminus. Hydrolysis of some of the N-allyl derivatives results in the formation of some new derivatives of 5-fluorouracil. Part B describes the reactions that occur when polyfluor - inated monocyclic, polycyclic and heterocyclic ring systems are treated with dimethylsulphoxide activated by dicyclohexycarbodi-imide or by trifluoroacetic anhydride. Fluorinated phenolic type compounds give products which are the result of a [2,3] sigmatropic rearrangement of the derived sulphoniumylide. Fluorinated anilines and thiophenols behave differently. Dearomatization occurs under very mild conditions. A number of reactions of the fluorinated cyclohexa-2,4-dienone products are described. The preparation and attempted rearrangement of 2,3,4,5,6- pentafluorobenzylmethylsulphoxide is also discussed.
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Chlorosulphonic acid in heterocyclic synthesis-cyclic sulphones and ketoarylidene derivativesBassin, Jatinder Paul January 1991 (has links)
No description available.
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Reactions of iron pentacarbonyl with organic compounds.Alper, Howard. January 1967 (has links)
No description available.
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Nuclear charge distribution in the region of symmetric fission of 238U by protons of energy 20-85 MeVSarkar, Samir. January 1974 (has links)
No description available.
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Photoproduction of pseudoscalar mesons at high energy.Ray, Siddhartha. January 1972 (has links)
No description available.
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The reactions of active nitrogen with oxides of sulphur.Jacob, Adir January 1968 (has links)
No description available.
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Recoil studies of (p, pn) reactions induced in 65CU and 197Au with 20-85 mev protons.Dewanjee, Mrinal Kanti. January 1967 (has links)
No description available.
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Study of HCN elimination from some polycyano compounds. / HCN elimination from some polycycano compounds.Abdel-Rehiem, Ahmed Gamal January 1973 (has links)
No description available.
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Syntheses and reactions of imidazo [1,2-a] pyridines.Valentin, Kazimir. January 1966 (has links)
No description available.
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A mechanistic study of the nucleophilic aromatic substitution of some substituted 10-methylacridonesHodgeman, Daryl Kimberly Cameron January 1971 (has links)
iv, 224 leaves : ill. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.1972) from the Dept. of Organic Chemistry, University of Adelaide
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