Search for dissertations about: "Iridium"

Showing result 1 - 5 of 66 swedish dissertations containing the word Iridium.

  1. 1. Iridium Catalysed Asymmetric Hydrogenation of Pyridines

    University dissertation from Uppsala : Uppsala universitet

    Author : Alban Cadu; Uppsala universitet.; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; hydrogenation; pyridine; catalytic; Iridium; Organisk kemi; Organic Chemistry;

    Abstract : This thesis presents the hydrogenation of substituted pyridines using N,P-ligated iridium catalystsin homogeneous media. These iridium catalysts were developed within this research group in thepast decade. This method of hydrogenation is highly stereoselective, and in several cases good to excellent ees were obtained. READ MORE

  2. 2. Enantio- and Regioselective Iridium-Catalyzed Hydrogenation of Olefins From Development to Total Synthesis

    University dissertation from Stockholm : Department of Organic Chemistry, Stockholm University

    Author : Cristiana Margarita; Stockholms universitet.; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Asymmetric hydrogenation; Iridium; Regioselectivity; Kinetic resolution; Total synthesis; Organic Chemistry; organisk kemi;

    Abstract : The work presented in this thesis concerns the iridium-catalyzed asymmetric hydrogenation of cyclic olefins and allylic alcohols for the preparation of useful chiral intermediates with various substitution patterns. The strategy provides stereocontrol for both non-functionalized as well as functionalized substrates and aims to be implemented in the stereoselective preparation of chiral building blocks having more than one stereocenter. READ MORE

  3. 3. Asymmetric Hydrogenations using N, P - Ligated Iridium Complexes

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Alexander Paptchikhine; Uppsala universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; asymmetric hydrogenation; iridium; birch; boronates; fluorine;

    Abstract : The research described in this thesis focuses on the catalytic asymmetric hydrogenation of prochiral olefins using N, P – chelated iridium catalysts. This catalytic system is tolerant to a wide range of substrates and performs better than the well-known ruthenium- and rhodium-catalytic systems for substrates devoid of coordinating groups in proximity of the olefin. READ MORE

  4. 4. Nickel and iridium pincer complexes with saturated frameworks - synthesis and reactivity

    University dissertation from Department of Chemistry, Lund University

    Author : Klara Jonasson; Lunds universitet.; Lund University.; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; PCP complexes; aliphatic pincer ligands; coordination; cyclometallation; iridium; nickel; organometallic synthesis; CO2 activation; catalysis;

    Abstract : Popular Abstract in Swedish Enkla kolväten och koldioxid är kemiskt stabila föreningar med mycket låg reaktivitet. På grund av en god råvarutillgång finns ett stort intresse för aktivering och omvandling av dessa föreningar till mer förädlade eller användbara produkter. READ MORE

  5. 5. Asymmetric Hydrogenation of Functionalized Olefins Using N,P-Ligated Iridium Complexes

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Taigang Zhou; Uppsala universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; asymmetric hydrogenation; iridium; Ramberg-Bäcklund reaction; sulfone; heterocycle; preclamol; remikiren;

    Abstract : Transition-metal-catalyzed asymmetric hydrogenation is one of the most efficient, straightforward, and well-established methods for preparing enantiomerically enriched compounds. Over the past decades, significant progress has been made with iridium, rhodium and ruthenium complexes to asymmetric hydrogenate a selection of olefins, such as, α,β-unsaturated carboxylic acid derivatives, ketones, imines and phosphonates. READ MORE