Global ETD Search

21	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
22	Cycloaddition dipolaire [3+2] à partir d'hétérocycles aromatiques N-aminés Perreault, Christian January 2008 (has links) Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal. Ylures de N-iminoquinolinium Azométhine imine Désaromatisation Catalyse Acide de Lewis Cycloaddition dipolaire-[3+2] Dipolarophile Auxiliaire chiral Informations mécanistiques Cycloadition dipolaire homo[3+2] N-Iminoquinolinium ylide Azinethine imine Dearomatization Catalysis Lewis acid [3+2] Dipolar cycloaddition Dipolarophile Chiral auxiliary Mechanistic insight Homo [3+2] dipolar cycloaddition
23	Cycloaddition dipolaire [3+2] à partir d'hétérocycles aromatiques N-aminés Perreault, Christian January 2008 (has links) Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal Ylures de N-iminoquinolinium Azométhine imine Désaromatisation Catalyse Acide de Lewis Cycloaddition dipolaire-[3+2] Dipolarophile Auxiliaire chiral Informations mécanistiques Cycloadition dipolaire homo[3+2] N-Iminoquinolinium ylide Azinethine imine Dearomatization Catalysis Lewis acid [3+2] Dipolar cycloaddition Dipolarophile Chiral auxiliary Mechanistic insight Homo [3+2] dipolar cycloaddition

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