Sökning: "Lewis acid catalysis"

Hittade 3 uppsatser innehållade orden Lewis acid catalysis.

1. 1. Catalytic synthesis of benign bisphenols

   Kandidat-uppsats, KTH/Kemi

   Författare :Victoria Chu; Emma Lundqvist; Hampus Hagelin; [2022]
   Nyckelord :Bisphenols; Vanillyl alcohol; Friedel-Crafts alkylation; Lewis acid catalysis; Sustainability; Bisfenoler; Vanillylalkohol; Friedel-Crafts alkylering; Lewissyra-katalys; Hållbarhet;

   Sammanfattning : This study analyzes the reactivity and selectivity of Friedel-Crafts alkylations using benzylic alcohols and phenols in the presence of a Lewis acid, to synthesize methoxylated bisphenols as a benign alternative to BPA. The degree of methoxylation on the electrophile appears to affect the yield of the reaction while the degree of methoxylation on the nucleophile appears to affect the selectivity. LÄS MER

3. 2. Syntes och Applikationer av Kirala Karbokatjoner

   Master-uppsats, KTH/Skolan för kemivetenskap (CHE)

   Författare :ANA ALICIA PALÉS GRAU; [2015]
   Nyckelord :Carbocation; Asymmetric catalysis; Lewis acid; Diels Alder; Organocatalys;

   Sammanfattning : Asymmetric synthesis is most significant method to generate chiral compounds from prochiral substrates. It usually involves a chiral catalysis, which can be either metal based or organo-catalysis. Both of these systems have their own advantages and disadvantages. LÄS MER

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

   Master-uppsats, KTH/Skolan för kemivetenskap (CHE)

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

   Sammanfattning : 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. LÄS MER