Search for dissertations about: "SUBSTITUTED 1"

Showing result 1 - 5 of 235 swedish dissertations containing the words SUBSTITUTED 1.

  2. 1. Sequential complex FIR-structure optimization

    Author : To Tran; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite Impulse Response FIR ; Digital filter design;

    Abstract : Over the past 40 years, the area of digital signal processing and filtering has undergone a rapid development. Today, most of the filtering tasks, that before were performed by using analog technology, have been substituted with inexpensive and, often, more reliable and flexible digital solutions. READ MORE

  4. 2. 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

  5. 3. Lignin Model Compounds: Synthesis, Stereochemistry and Acidolysis

    Author : Shiming Li; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; boric acid complexes; Arylglycerol b-aryl ethers; stereochemistry; 3-Diaryl-2-propen-1-ols; 1; Phenylcoumarans; lignin model compounds; acidolysis; ion-exchange chromatography; 3-propanediols; 2-Diaryl-1; 2; X-ray crystallography;

    Abstract : Lignin model compounds representative of structural elements in lignin of the b-1, b-5, b-O-4, cinnamaldehyde and cinnamyl alcohol types were synthesized. erythro-Forms of b-1 models of the 1,2-diaryl-1,3-propanediol type were prepared by BF3-catalyzed rearrangement of chalcone epoxides and subsequent reduction of the rearrangement products with NaBH4. READ MORE

  6. 4. Structure-Assisted Design of Drugs Towards HIV-1 and Malaria Targets : Applied on Reverse Transcriptase and Protease from HIV-1 and Plasmepsin II from Plasmodium falciparum

    Author : Jimmy Lindberg; Torsten Unge; Alexander Wlodawer; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Molecular biology; X-ray crystallography; Drug design; HIV-1; Malaria; Molekylärbiologi; Molecular biology; Molekylärbiologi;

    Abstract : Globally of today, acquired immunodeficiency syndrome (AIDS) and malaria are two of the most threatening diseases known to mankind. The World Health Organization estimated that AIDS and malaria together claimed nearly 4 million lives in 2003 and many more were infected by the causative agent human immunodeficiency virus (HIV) and the Plasmodium falciparum (P. READ MORE

  7. 5. Synthesis and conformational analysis of amino-substituted alicyclic derivatives of 5H-dibenzo[a,d]cycloheptene and diphenylmethane : new uptake inhibitors of noradrenaline as potential antidepressants

    Author : Tomas de Paulis; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : .... READ MORE