Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Sesquiterpenes"”.
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The Total Syntheses of Several Eremophilane Sesquiterpenes
Made available in DSpace on 2014-12-09T17:36:39Z (GMT). No. of bitstreams: 1 7013480.pdf: 4574386 bytes, checksum: 9c9a4ea7fb8ba3ddce2cb2a2cc8386d6 (MD5) Previous issue date: 1969
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Rearrangements and biogenetic relationships of silphinane sesquiterpenes
… a branch point in the biogenesis of triquinane sesquiterpenes such as silphiperfol-6-ene, silphinene, and related compounds.
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The synthesis of two related sesquiterpenes / by Colin F. Ingham
iii, 181 leaves ; 27 cm.
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The Total Synthesis of (-)-Prezizaene, (-)-Prezizanol, and Other Perzizanoid Sesquiterpenes
The synthesis of four related sesquiterpenes was accomplished by elaboration of the chiral precursor pulegone. The ring system of (-)-prezizaene and (-)-prezizonal was constructed by intramolecular ring expansion of a diazo ethyl hydrindanone. (-)-Georgeone and (-)-georgeol containing a C-6 methyl …
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Modified Farnesyl Diphosphate, Germacrane, and Eremophilane Sesquiterpenes as Probes for Capsidiol *Biosynthesis
The final part of this thesis discusses the preparation and characterization of two deoxycapsidiols as well as a series of capsidiol analogs including epiaristolochene and two isomers. Overall, ten capsidiol derivatives were synthesized from capsidiol and sent to collaborators for various …
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[4+1] cyclopentene annulation in the total synthesis of pentalenene type sesquiterpenes
The generality of the [4+1] cyclopentene annulation was demonstrated by the total synthesis of (±)-pentalenene and its C-9 epimer which were prepared in a stereocontrolled manner in analogy with the synthesis of (±)-isocomene, (±)-hirsutene and (±)-pentalenic acid. The key features of this …
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The isolation, characterization and antiplasmodial activity of two novel dimeric sesquiterpenes from Dicoma anomala
The study investigates the antimalarial potential of a Southern African traditional medicinal plant, Dicoma anomala (Sond.). The plant is used to treat a variety of treatments including fevers. The extracts of the leaves and twigs have been reported to treat malaria and fever but the treatments …
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Time Dependent Uptake of Volatile Organic Compounds on Silica and the Observation and Quantification of Ambient Sesquiterpenes in Virginia
… was observed to increase from isoprene to sesquiterpenes, with several monoterpene isomers exhibiting distinct adsorption behavior based on structural differences. The sesquiterpene examined, β-caryophyllene, exhibited continuous uptake onto the silica surface and such uptake behavior could …
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Stereochemistry and Mechanism of the Enzyme -Catalyzed Cyclizations of Farnesyl Diphosphate to the Sesquiterpenes Epi -Aristolochene, Epi-Eremophilene and Vetispiradiene
Chiral methyl FPPs were prepared by the displacement of allylic monodeuterated diethyl phosphates with LiBEt3T. (12R)- and ( 12S)-[12-2H1, 12-3H 1]FPPs were incubated with TEAS, and the 3H NMR spectra showed that several tritiated compounds were present. The facial selectivity of the proton …
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The application of novel mass spectrometric techniques for the analysis of volatile organic compounds in different environments
… and as many alkenes (primarily monoterpenes and sesquiterpenes) have been shown to play a significant role in tritrophic signalling it was hypothesised that ozone may disrupt this signalling. This thesis investigates the effect of ozone on tritrophic signalling using a Brassica napus – Myzus …
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New cytotoxic natural products from North-Eastern Pacific marine invertebrates
… 3 g.ig/mL and 10.6 pg/mL, respectively. The new sesquiterpenes 0-methyl 9-oxofurodysinin lactone (72), 2-oxomicrocionin-2 lactone (73), 0-methyl2-oxomicrocionin-2 lactone (74) as well as seven previously reported sesquiterpenes (35, 36, 56, 57, 41, 43, and 44)were also isolated from the sponge …
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Secondary metabolites in the Parastagonospora nodorum-wheat pathosystem
… antibacterial activities. Furthermore, several sesquiterpenes were detected within the VOCs mixture. Since previous bioinformatics survey on P. nodorum revealed the presence of three sesquiterpene synthases genes, Sts01, Sts02 and Sts03, a reverse genetics approach was then exploited to link …
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Secondary metabolites in the Parastagonospora nodorum-wheat pathosystem
… antibacterial activities. Furthermore, several sesquiterpenes were detected within the VOCs mixture. Since previous bioinformatics survey on P. nodorum revealed the presence of three sesquiterpene synthases genes, Sts01, Sts02 and Sts03, a reverse genetics approach was then exploited to link …
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Molecular studies of natural products and related compounds.
… are varied in type and include alkaloids, sesquiterpenes and quinones, as well as natural product derivatives. Perspective drawings of each of the compounds allows their structure to be seen more clearly. Where possible molecular mechanics calculations have been carried out on these …
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Functionality of Azadirachta indica A. Juss (neem) in beverages
… in other samples. There is a preponderance of sesquiterpenes found in dried leaves and leaf powder. Diterpenes and acids were found to be major distinguishing factors between the HS-SPME and essential oil volatile composition of dried neem leaf powder. The study reveals information about the …
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The module mir156/spl affects bixin biosynthesis pathway in annatto (Bixa orellana L.)
… miR156/SPL module regulates the biosynthesis of sesquiterpenes, flavonoids, anthocyanins, and carotenoids in higher plants. In this context, B. orellana is a promising woody species with an expressive secondary metabolism activity. Therefore, we aimed to assess phenotypic changes, plant …
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Isolation and Structure Elucidation of Anticancer and Antimalarial Natural Products
… two new and two known antiproliferative sesquiterpenes lactones from Piptocoma antillana (Asteraceae); one new antiproliferative 1,4-naphthoquinone, one known antiproliferative isoflovonoid, and five known antiproliferative stilbenoids from Stuhlmannia moavi (Leguminosae); four known …
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Phytochemical Investigation of Psychoactive Medicinal Plants for the Treatment of Neurological Disorders
… the bioactive fraction, acacetin and a series of sesquiterpenes were isolated; acacetin was found to be the bioactive compound. A series of acacetin analogs were designed with the aid of computational docking studies, to improve their selectivity towards MAO-B. The structures of the isolated …
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Stereoselective Intramolecular Rhodium(I)-Catalyzed [(3+2+2)] Cycloaddition Reactions of Alkylidenecyclopropanes (ACPs) for the Concise Synthesis of Bridged Tricyclic Products
… bridged tricyclic skeletons—present in bioactive sesquiterpenes—remains underdeveloped. Chapter 1 introduces transition metal-catalyzed higher-order [m+n+o] cycloaddition reactions, followed by a focused review of stereoselective metal-catalyzed intramolecular [(m+2+2)] cycloadditions for the …
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