Search for dissertations about: "alder"

Showing result 6 - 10 of 59 swedish dissertations containing the word alder.

2. 6. Lewis Acid Mediated Alkylation and Diels-Alder Reactions of 2H-Azirines

   Author : Erik Risberg; KTH; []
   Keywords : 2H-azirines; Lewis acid activation; chiral ligandsorganolithium reagentsDiels-Alder reactions; DFT-calculations;

   Abstract : This thesis describes the use of 2H-azirines as reactivesubstrates in Lewis acid catalysed nucleophilic additions andin the Diels-Alder reaction.A number of carbon nucleophiles have been added to aseries of 2H-azirines in the presence and absence ofBF3·Et2O. READ MORE

4. 7. Crystal structures of 1,4-ethanonaphthalenes : studies of Diels-Alder adducts of 2,4-cyclohexadienones

   Author : Bengt Karlsson; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : The present summary concerns crystal structure investigations of the 1,4-ethanonaphtha1ene class of compounds. The structures of eight such compounds have been determined by the present author and coworkers. READ MORE

5. 8. On the Ring-Opening Reaction of Thiophene-1,1-dioxides and the Intramolecular Diels-Alder Reaction of Azanona- and AzadecatrienesI

   Author : Anders Sebastian Tsirk; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; transition states; 3-21G * ; intramolecular Diels-Alder reactions; asymmetric induction; multivariate optimization; kinetic isotope effects; rearrangements; secondary amines; 1-dioxides; Ring-opening reaction; thiophene-1; stereoselectivity.; Organic chemistry; Organisk kemi;

   Abstract : Substituted thiophene-1,1-dioxides were synthesized and their ring-opening reactions with omega-unsaturated secondary amines were investigated; this led to a synthetic route to azatrienes and to the preparation of some polyhydroisoindoles and polyhydroisoquinolines via an intramolecular Diels-Alder reaction. By using 2-substituted pyrrolidines and piperidines various tetrahydrobenzo[f]indolizidines, benzo[b]quinolizidines, tetrahydrobenzo[a]indolizidines and tetrahydro[a]pyrrolizidines could be synthesized via the ring-opening of 3-bromo-2,5-dimmethylthiophene-1,1-dioxide and a subsequent intramolecular Diels-Alder reaction. READ MORE

6. 9. Wood-inhabiting fungi of alder forests in north-central Scandinavia : 1, Aphyllophorales (Basidiomycetes). Taxonomy, ecology and distribution

   Author : Åke Strid; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Basidiesvampar; ekologisk botanik; Ecological Botany;

   Abstract : Wood-inhabiting fungi were collected on different trees in 99 loca-' lities of alder woods, dominated by Alnus incana or occasionally A. glutinosa, in N-C Sweden and C Norway. Most of the localities are situated near the east coast of Sweden where the prevailing land elevation creates conditions suitable for colonization by alder. READ MORE

7. 10. Natural Product Synthesis and Development of Novel Reaction Methodology

   Author : Jakob Danielsson; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; perophoramidine; communesin; quaternary stereocenter; Diels-Alder; 1; 2-asymmetric induction; polar Felkin-Anh; Cornforth-Evans; Mukaiyama aldol; 3-dipolar cycloaddition; azomethine ylide; 2-amino alcohol; anti-α-amino-β-hydroxy ester;

   Abstract : This thesis deals with the development of new reaction methodology for stereoselective synthesis, as well as total synthesis of natural products and investigations of the stereochemical outcome in the Mukaiyama aldol reaction. Chapter 2 describes efforts made towards the total synthesis of the oxindole natural products perophoramidine and the communesin. READ MORE