Global ETD Search

1	A study of the displacement of halogen from chlorinated heteroaromatic azines by dialkali salts of benzoylacetone, disodio salts of certain 2-hydroxy-4-methylpyrimidines, and the methylsulfinyl carbanion Greene, James Carson 25 August 2008 (has links) Halogenated monocyclic and bicyclic heteroaromatic azines, possessing a six or ten w-electron system and one or two ring nitrogens, have been shown to undergo nucleophilic displacement of halide ion with a variety of nucleophiles. A detailed review of the relative reactivity of compounds of these classes, as well as halogenated heteroaromatic azines containing as many as four nitrogen atoms has appeared. / Ph. D. LD5655.V856 1971.G74
2	Studies towards Developing Diastereoselective SN1 Reactions of α-Keto Carbocations Dubland, Joshua 06 April 2010 (has links) Although α-keto carbocations have been demonstrated to be viable intermediates in solvolysis reactions, their applications in synthesis are scarce. These species can be considered to be equivalent to “reversed polarity” enolates and, as such, could be useful for the asymmetric formation of carbon-carbon and carbon-heteroatom bonds. In principle, facial selectivity in additions to α-keto carbocations may be induced using easily removed ester, amide, or imide chiral auxiliaries. Efforts to achieve such diastereoselective SN1 reactions of α-keto carbocations are described herein. diastereoselective SN1 reaction alpha-keto carbocation nucleophilic substitution reaction carbon-carbon bond forming reaction carbon-heteroatom bond forming reaction chiral auxiliary asymmetric synthesis Lewis acid-mediated Bronsted acid-mediated silver-mediated organic chemistry leaving group ester amide imide 0490 0485
3	Studies towards Developing Diastereoselective SN1 Reactions of α-Keto Carbocations Dubland, Joshua 06 April 2010 (has links) Although α-keto carbocations have been demonstrated to be viable intermediates in solvolysis reactions, their applications in synthesis are scarce. These species can be considered to be equivalent to “reversed polarity” enolates and, as such, could be useful for the asymmetric formation of carbon-carbon and carbon-heteroatom bonds. In principle, facial selectivity in additions to α-keto carbocations may be induced using easily removed ester, amide, or imide chiral auxiliaries. Efforts to achieve such diastereoselective SN1 reactions of α-keto carbocations are described herein. diastereoselective SN1 reaction alpha-keto carbocation nucleophilic substitution reaction carbon-carbon bond forming reaction carbon-heteroatom bond forming reaction chiral auxiliary asymmetric synthesis Lewis acid-mediated Bronsted acid-mediated silver-mediated organic chemistry leaving group ester amide imide 0490 0485

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