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Showing 1 to 20 of 403 for “"Nucleophilic"”.
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Endocyclic Nucleophilic Methyl Transfer
This thesis describes the synthesis of three methyl (omega)-(dimethyl- amino)alkanesulfonates and the experiments used to determine the mechanism of their rearrangements to the corresponding (omega)-(trimethylammonio)alkanesulfonates. Since existence of an intra- molecular pathway would represent …
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Nucleophilic aromatic substitution of metallabenzenes
… can undergo a new benzenelike reaction - nucleophilic aromatic substitution of hydrogen (SN H) (Scheme 0-1). In this process, the nucleophile (Nu) first attacks the cationic metallabenzene (A) at the γ position to the neutral metallacyclohexadiene compound (B). Oxidation with an external …
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Nucleophilic Displacements on Azomethine Nitrogen
Made available in DSpace on 2014-12-10T23:02:04Z (GMT). No. of bitstreams: 1 7511576.pdf: 9110367 bytes, checksum: 1b58d68719755195a6e706de6ba94913 (MD5) Previous issue date: 1974
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Studies of Nucleophilic Substitution at Neutral Nitrogen
The mechanism of nucleophilic substitution at a formally neutral nitrogen has been investigated. The two limiting mechanisms are a concerted reaction in which the transition state has the nucleophile and leaving group associated with nitrogen and an ionization process involving the initial …
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Nucleophilic Displacement of Substituents in Hindered Aromatic Ketones
Made available in DSpace on 2014-12-05T19:35:55Z (GMT). No. of bitstreams: 1 0009069.pdf: 5230208 bytes, checksum: 9198e67bc0684b5dc24377aa7590c318 (MD5) Previous issue date: 1954
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Nucleophilic displacement reactions of some carbohydrates in dimethyl sulphoxide
… of toluene-p-sulphonic acid rather than nucleophilic substitution. The results of the work are presented within the context of possible approaches to converting pentoses into hexoses by way of chain extension reactions at the C-5 carbon atom of pentofuranoses.
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Nucleophilic displacement reactions of some carbohydrates in dimethyl sulphoxide
… of toluene-p-sulphonic acid rather than nucleophilic substitution. The results of the work are presented within the context of possible approaches to converting pentoses into hexoses by way of chain extension reactions at the C-5 carbon atom of pentofuranoses.
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The Nucleophilic Reaction of O-Methylisourea With Organic Amines
No abstract prepared.
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Nucleophilic Carbon-Carbon Bond-Forming Reactions of 2-Methylenetetrahydropyrans
… respect to general methods demonstrating their nucleophilic nature. This work provides three general methods toward the synthesis of 2-β-oxygenated pyranyl substrates, which are key structural components of many biologically active polyketides and natural products.</p> <p>The use of exocyclic …
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Studies of nucleophilic displacement at nitrogen of hydroxylamine derivatives
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:55:18Z Item is restricted indefinitely.
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Intermediates and Mechanisms of Gold(I)-Catalyzed Nucleophilic Addition Reactions
… of alkenes, alkynes and allenes to initiate nucleophilic addition reactions. As the key intermediates in these reactions, there has been recent interest in the synthesis and study of cationic, two-coordinate gold pi-hydrocarbon complexes. However, few experimental studies have been focused on …
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Applications for the activation of hydroxyl groups to nucleophilic attack
… of the activation of hydroxyl groups to nucleophilic attack within three key areas: Cyclic five-membered thionocarbamates bearing a N-Boc group undergo ring opening reactions at the 5-C with soft nucleophiles such as thiophenolate, pyridine-2-thiolate and potassium thioacetate. Hard …
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Regioselective, Nucleophilic Activation of C-F Bonds in o-Fluoroanilines
Reactions of fluorinated anilines with stoichiometric Ti(NMe2)4 in mesitylene (typically for 23 h at 120 °C) afforded moderate to high yields of the corresponding N,N-dimethyl-o-phenylenediamine derivatives resulting from defluoroamination of a fluorine atom ortho to the NH2 of the starting …
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A STUDY OF ENDOCYCLIC NUCLEOPHILIC SUBSTITUTION AT SULFUR(VI) (SULFONATE ESTERS)
<p>To investigate the effect of geometry on nucleophilic substitution at sulfur (VI), a search was made for examples of endocyclic substitution. Substrate molecules were synthesized and then treated with strong bases, n-butyllithium or lithium diisopropylamide, in order to deprotonate a nitrogen or …
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