Sökning: "Benzyl Ethers"
Visar resultat 1 - 5 av 6 avhandlingar innehållade orden Benzyl Ethers.
1. A Novel Rearrangement of Allyl Benzyl Ethers and Aspects on the Glyoxylate Ene Reaction
Sammanfattning : This thesis describes an improvement of the glyoxylate ene reaction by using siamyl glyoxaylate and a development of the novel rearrangement of allyl benzyl ethers. The glyoxylate ene reaction was used as a key reaction in a 8-step synthesis of a Taxol A-ring building block. LÄS MER
2. Fundamental Aspects of Lignin Carbohydrate Complexes (LCC) : Mechanisms, Recalcitrance and Material concepts
Sammanfattning : Covalent bonds between lignin and carbohydrates, forming a matrix referred to as lignin carbohydrate complexes (LCC), remain one of the most controversial topics in wood chemistry. A key issue is whether they are formed during chemical and mechanical pretreatments of the compact wood structure or actually present in wood prior to isolation. LÄS MER
3. Lignin-carbohydrate complexes: Model compounds synthesis
Sammanfattning : In lignocellulose there is a recalcitrant interaction by covalent and non-covalent bonds called the lignin-carbohydrate complex. This interaction has been the subject of studies trying to unveil its chemical structure, to understand the mechanims involved in its formation and to determine its influence on practical applications such as the process of turning biomass into ethanol. LÄS MER
4. Lewis acid promoted endocyclic cleavage of glycosides and related acetals
Sammanfattning : This thesis is a summary of five papers concerning endocyclic cleavage of glycosides and related acetals. Simple lactol ethers undergo endocyclic cleavage to give acyclic chain extended products on treatment with organoaluminium and organotitanium reagents. LÄS MER
5. Synthesis and Development of Methods for Preparation of Inositolphosphoglycans, Glycoglycerolipids and Glycerophospholipids
Sammanfattning : This thesis describes the synthesis of a series of myo-inositol-containing oligosaccharides, and the exploration of using the chiral epoxide (S)-glycidol in short synthetic routes to glycoglycerolipids and glycerophospholipids.In chapter 2, synthesis of the core heptasaccharyl myo-inositol Galp(α1-6)Galp(α1 -3)Galf(β1-3)[Glcp(α1-P04-6)Manp](α1-3)Manp(α1-4)GlcNp(α1-6)Ins-1-P04, found in the lipophosphoglycans of Leishmania parasites, is described. LÄS MER