Search for dissertations about: "ring-contraction"
Found 3 swedish dissertations containing the word ring-contraction.
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1. Synthesis and Rearrangement of Epoxy Sugars
Abstract : Ring-Contraction of sugar-derived epoxy alcohols, functionalised in position 1 and 6, by treatment with lithium bromide and N, N, N', N'-tetramethylurea in refluxing toluene gave enantiomerically pure a,b-unsaturated aldehydes of furanosides. O-Glycosidic epoxy alcohols gave only one, easily purified, aldehyde in approximately 30-60% yield depending on the substitution pattern. READ MORE
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2. Total synthesis of enantiomerically pure natural products via chiral unsaturated aldehydes formed by ring-contraction of sugar epoxides
Abstract : .... READ MORE
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3. Synthesis of heterocycles from anthranilic acid and its derivatives
Abstract : Anthranilic acid (2-aminobenzoic acid, Aa) is the biochemical precursor to the amino acid tryptophan, as well as a catabolic product of tryptophan in animals. It is also integrated into many alkaloids isolated from plants. Aa is produced industrially for production of dyestuffs and pharmaceuticals. READ MORE