Sökning: "pine sawfly"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden pine sawfly.

1. 1. Chemoenzymatic methods for the syntesis of pine sawfly sex peromones

   Författare :Helen Edlund; KTH; []
   Nyckelord :pheromone syntheses; pine sawfly; diprion pini; gilpinia pallida; kenetic resolution; water activity;

   Sammanfattning : This thesis describes the syntheses of pine sawfly sexpheromones via two synthetic routes. The preparation ofenantiomerically pure building blocks for these is alsodescribed.Lipase catalysed methods were developed for either theresolution or desymmetrisation of building blocks. LÄS MER

3. 2. Natural products from nonracemie building blocks : synthesis of pine sawfly pheromones

   Författare :Michael Larsson; Torbjörn Norin; Gunnar Westman; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; Total synthesis; diastereoselective addition; dimethylzinc; Lewis acid; alkyllithium; Organisk kemi; Organic chemistry; Organisk kemi;

   Sammanfattning : This thesis describes a number of synthetic approaches for obtaining chiral, enantiomerically pure natural products, in particular some semiochemicals. This has been accomplished by using various strategies; by starting from compounds from the chiral pool, by using chiral auxiliaries, via enzymatic resolutions or by chemical asymmetric synthesis. LÄS MER

4. 3. Chiral building blocks for synthesis of pine sawfly sex pheromones Enantioselective Lipase Catalysed Acylations and Esterifications of Primary Alcohols and Acids and Synthesis of the Sex Pheromone of the Pine Sawfly Microdiprion pallipes

   Författare :Ba-Vu Nguyen; KTH; []
   Nyckelord :lipase; Pseudomonas cepacia; Candida rugosa; enantioselective; enantiomeric ratio; primary 2-methylalcohol; substituted-methylcarboxylic acid; pine sawfly; Microdiprion pallipes; sex pheromone; 3; 7; 11-trimethyl-2-tridecanol; stereoisomer;

   Sammanfattning : This thesis describes the development of new methods for thepreparation of enantiomerically pure methyl branched alkylcompounds and their use as building blocks in the synthesis ofstereoisomerically pure pheromones of pine sawflies.The high regioselectivity, enantioselectivity and activityof lipases in organic solvent in conjunction withenvironmentally compatible reaction conditions have madelipase-catalysed synthesis an attractive alternative toconventional synthetic methods in organic chemistry. LÄS MER

5. 4. 1. Asymmetric aldol and alkylation reactions using pyrrolidine-based chiral auxiliaries 2. Syntheses of pine sawfly pheromone precursors and structurally related compounds

   Författare :Fredrik Andersson; KTH; []
   Nyckelord :Chiral auxiliary; Stereoselectivity; Lewis acid; Aldol; Alkylation; Sex pheromone; Pine sawfly; Lipase; Synthesis; Diprion nipponica; Macrodiprion memoralis; Microdiprion pallipes; ;

   Sammanfattning : This thesis describes the syntheses of the 1-propionylatedauxiliaries (S)-(− )-2-(pyrrolidin-2-yl)propan-2-ol and (S)-(− )-2-(1-methoxy-1-methylethyl)pyrrolidine andtheir use in asymmetric aldol and alkylation reactions. Thesynthesis of 1-propionylated (2S,4R) 2-{4-[(tert-butyldimethylsilyl)oxy]pyrrolidin-2-yl}propan-2-olis also described. LÄS MER

7. 5. 1. Asymmetric aldol and alkylation reactions using pyrrolidine-based chiral auxiliaries 2. Syntheses of pine sawfly pheromone precursors and structurally related compounds

   Författare :Fredrik Andersson; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chiral auxiliary; Stereoselectivity; Lewis acid; Aldol; Alkylation; Sex pheromone; Pine sawfly; Lipase; Synthesis; Chemistry; Kemi;

   Sammanfattning : .... LÄS MER