Search for dissertations about: "b-unsaturated aldehyde"

Found 2 swedish dissertations containing the words b-unsaturated aldehyde.

2. 1. Synthesis and Rearrangement of Epoxy Sugars

   Author : Fritiof Pontén; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organisk kemi; Organic chemistry; crown ether; silica; Intramoleculaf Diels-Alder reaction; radical allylation; allyl sulfone; sugar epoxide; allyl sulfide; ring-contraction; C-glycoside; a; IMDAF; b-unsaturated aldehyde;

   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

4. 2. Carbon Monoxide in Catalytic Hydrogenations: A Poison or a Promoter?

   Author : Ulf Schröder; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : The hydrogenation of a,b-unsaturated aldehydes was studied over a platinum catalyst. It was shown that the catalyst was rapidly deactivated by CO formed by decarbonylation of the aldehyde. This deactivation was suppressed by the addition of small amounts of oxygen to the feed, since CO was oxidized to CO2 in the presence of oxygen. READ MORE