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Showing 1 to 7 of 7 for “"Lewis base catalysis"”.
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Lewis Base Catalysis: I. Catalytic Enantioselective Aldol Additions of Methyl Trichlorosilyl Ketene Acetal to Ketones. II. Catalytic Enantioselective Alpha-Additions of Isocyanides to Aldehydes
The first catalytic, enantioselective alpha-addition reaction of isocyanides has been demonstrated with a SiCl4·bisbinaphthyldiamine phosphoramide catalyst. Good yields have been obtained with aromatic, heteroaromatic, conjugated non-aromatic and non-branched aliphatic aldehydes. Aromatic, …
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Asymmetric Lewis base catalysis: I. Lewis base catalyzed halogenation and development of an enantioselective bromocycloetherification reaction; II. enantioselective addition of silyl ketene imines to carbonyl electrophiles
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-06-15T13:39:00Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Thesis-6-12.docx: 11084823 bytes, checksum: 0609048b408ae3adf1f485e3a9dde5d3 (MD5) Burk_Matthew.pdf: 14255171 bytes, …
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Enantioselective, Lewis base-catalyzed transformations: I. Polyene sulfenocyclization (preparative and mechanistic aspects) II. Sulfenofunctionalization of alkenyl boronates enabled by 1,2-boronate migration
… projects which are united under the umbrella of Lewis base catalysis. Following an overview of the key principles behind Lewis base catalysis and how it is used to enhance the electrophilicity of Lewis acids (Chapter 1), the bulk of this thesis will focus on the development of a catalytic, …
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Synthesis, study and application of silyl ketene imines in Lewis base catalyzed carbonyl addition
The activation of Lewis acids by chiral Lewis bases has allowed for the development of a robust and highly selective catalyst system for the addition of silylated nucleophiles to carbonyl compounds. In general, aldolate-type products containing secondary and tertiary stereogenic centers are …
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Stereoselective synthesis of 1,2-disubstitued βeta-amino alcohols and amino thiols
… brief introduction of the activation of Group 16 Lewis acids by Lewis bases. Chapter 2 details a method for the catalytic, enantioselective, intermolecular, 1,2-sulfenoamination of alkenes. Functionalization is achieved through the intermediacy of an enantioenriched, configurationally stable …
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Enantioselective alkene difunctionalization enabled by organochalcogen catalysis I. Lewis base-catalyzed sulfenium ion transfer II. Organoselenium redox catalysis
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Lewis Base Promoted Annulations of Allenoates with 1,4-Naphthoquinones
<p>Lewis base promoted cyclization of allenoates with electron deficient olefins open up the possibility to generate more complex organic structures. By generating more complex molecules, we are able to produce new compounds for biomedical and material applications. Both phosphine and amine Lewis …