Essays about: "asymmetric catalysis"

Found 4 essays containing the words asymmetric catalysis.

  1. 1. Computational Design of an Enzyme-catalyzed Diels-Alder reaction

    University essay from KTH/Skolan för kemivetenskap (CHE)

    Author : Max Pettersson; [2016]
    Keywords : Diels-Alderase; Enzyme design; Catalysis; Computational chemistry; Molecular modelling;

    Abstract :    The Diels-Alder is an important reaction that is one of the primary tools for synthesizing cyclic carbon structures, while simultaneously introducing up to four stereocenters in the resulting product. Not only is it a widely explored reaction in organic chemistry, but a vital tool in industry to construct novel compounds for pharmacological applications. READ MORE

  3. 2. Chiral Carbocations as Lewis Acid Catalysts in Diels-Alder Reactions

    University essay from KTH/Skolan för kemivetenskap (CHE)

    Author : Annika Mellberg; [2012]
    Keywords : •Diels Alder •Asymmetric catalysis •Lewis acid •Carbocation •Organocatalys;

    Abstract : Lewis acids can be used as catalysts in different reactions, but the term Lewis acid catalysts often refers to metal salts. Metal complexes have been widely used for asymmetric catalysis. Asymmetric synthesis can however be performed in a metal-free way by using organocatalysis. READ MORE

  4. 3. Amino Alcohols from Asymmetric Transfer Hydrogenation of α-Amido-β-Keto Esters Possessing Olefins: Formal Total Synthesis of Sphingosine

    University essay from KTH/Skolan för kemivetenskap (CHE)

    Author : Elin Stridfeldt; [2012]
    Keywords : Asymmetric transfer hydrogenation; asymmetric catalysis; anti-β-hydroxy-α-amino ester; Sphingosine; cross metathesis;

    Abstract : In this thesis a methodology to synthesize anti-β-hydroxy-α-amino esters possessing olefins has been investigated. The developed procedures originate from two already established procedures in which α-amido-β-keto esters, which do not contain olefins, has been stereoselectively reduced to the corresponding anti-β-hydroxy-α-amino alcohols via asymmetric transfer hydrogenation coupled with dynamic kinetic resolution. READ MORE

  5. 4. Synthesis and characterization of transition metal carbonyl clusters with chiral ligands and their application in asymmetric catalysis

    University essay from Lunds universitet/Kemisk fysik

    Author : Atef Mannaa; [2010]
    Keywords : inorganic chemistry; oorganisk kemi; Chemistry;

    Abstract : Triruthenium dodecacarbonyl was reacted with the non chiral ligand PSSP as well as chiral ferrocenyl diphosphines of the Josiphos (J008, J006 and J015) and Walphos (W009) families to give [Ru3(CO)10(µ-1,2-P-P)], (P-P = W009 1, J008 2, J006 3, J015 4 and PSSP 5. The X-ray structure of 3 shows that a Ru-Ru edge is bridged by a diphosphine ligand in an equatorial coordination mode. READ MORE