Search for dissertations about: "intermediate product"

Showing result 1 - 5 of 105 swedish dissertations containing the words intermediate product.

2. 1. Transition-Metal Catalyzed Synthesis of Small- and Medium-Sized Rings Applications toward oxazole synthesis, cycloheptadienes, and natural products

   Author : Henrik von Wachenfeldt; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; catalysis; transition metal; cyclization; cycloaddition; natural product;

   Abstract : This thesis deals with the development of novel methodologies for the synthesis of hetero- and carbocycles enabled by transition metal catalysis. The second chapter of the thesis describes a gold-catalyzed three-component reaction to form a variety of substituted oxazoles from readily available N-benzylimines, terminal alkynes, and acyl chlorides. READ MORE

4. 2. A tandem Catalyst for hydrogenation of CO2 to light olefins — The role of the zeolite component

   Author : Wei Di; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Brønsted acid density; MTO reaction; CO2 hydrogenation; tandem catalysts; HCPs; methanol-intermediate; pre-coking; Al distribution; light olefins; SSZ-13 zeolite;

   Abstract : The catalytic conversion of waste CO2 into light olefins offers a sustainable pathway for green chemicals production in the future. Over a tandem catalyst with the bifunctional active sites for methanol synthesis (CTM) and methanol to olefins (MTO), CO2 can be efficiently converted via intermediate methanol into a mixture of light olefins (ethylene, propene, butene). READ MORE

5. 3. Structural biology of carbohydrate transfer and modification in natural product biosynthesis

   Author : Magnus Claesson; Karolinska Institutet; Karolinska Institutet; []
   Keywords : ;

   Abstract : Certain organisms, can during periods of limited resources, adapt their metabolism to enable biosynthesis of secondary metabolites, compounds that increase competitiveness and chances of survival. The subjects of this thesis are enzymes acting on carbohydrate substrates during secondary metabolism. READ MORE

6. 4. Stereoselective Nucleophilic Additions to α-Amino Aldehydes: Application to Natural Product Synthesis

   Author : Per Restorp; Peter Somfai; Timothy J. Donohoe; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Stereoselective synthesis; Substrate-control; α-Amino aldehydes; Mukaiyama aldol; Allylsilanes; [3 2]-Annulation; -Alexine; DGDP; Vinyl epoxides; Regioselectivity; Alkyne nucleophiles; Organic chemistry; Organisk kemi;

   Abstract : This thesis deals with the development and application of new synthetic methodology for stereo- or regioselective construction of carbon-carbon bonds in organic synthesis. The first part of this thesis describes the development of a divergent protocol for stereoselective synthesis of chiral aminodiols by employing Mukaiyama aldol additions to syn- and anti-α-amino-β-silyloxy aldehydes. READ MORE

7. 5. Essays on International Trade : Theory and Evidence on the Determinants and Implications of Firms' Import Behaviour

   Author : Evangelia Pateli; Rikard Forslid; Anders Åkerman; Philippe Martin; Stockholms universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; international trade; extensive margins of trade; international sourcing; hierarchical sorting; information spillovers; devaluations; intermediate import dependence; Economics; nationalekonomi;

   Abstract : This thesis aspires to further contribute to our understanding of both the determinants as well as the implications of intermediate goods trade. Faced with intensifying global competition, firms are increasingly developing their production process and their sourcing strategies beyond national borders in order to take advantage of lower costs, superior quality and technological advances. READ MORE