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 402 for “"polycyclic"”.
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POLYCYCLIC POLYAMINES: SYNTHESIS AND CONFORMATIONAL ANALYSIS
<p>The synthesis, conformational analysis, and reactivity of a homologous series of tricyclic orthoamides is discussed. The tricyclic orthoformamides, orthoacetamides, orthopropionamides, and orthobenzamides were synthesized by the uncatalyzed condensation of macrocyclic triamines with amide …
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Cascade Approaches to Polycyclic Natural Products
… core formation to rapidly assemble complex, polycyclic architectures in two different classes of natural products.
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Gas-phase Ion Chemistry of Hydroxy and Amino-substituted Interstellar Polycyclic Aromatic Hydrocarbons and Protonated Polycyclic Aromatic Hydrocarbons
… ion chemistry of hydroxyl- and amino-substituted polycyclic aromatic hydrocarbons (PAHs) and their protonated counterparts were studied using mass spectrometry. Ions were generated using an electron ionization (EI) source and the unimolecular chemistry of metastable ions was studied by performing …
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Studies of the Synthesis of Polycyclic Homocyclopropylcarbinols
A new synthetic route to polycyclic homocyclopropylcarbinols has been realized by lithiation of bromocyclopropyl epoxides with n-butyllithium and subsequent intramolecular attack of the metallated cyclopropane ring onto the epoxide. A series of bromocyclopropyl epoxides was prepared from diene …
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Diversity of polycyclic triterpenoids in Rhodospirillum rubrum
… a proven source. We observed similar patterns of polycyclic terpenoids in other hopanoid-producing c-proteobacteria, including Zymomonas mobilis, Rhodopseudomonas palustris, and Rhodomicrobium vannielii. The presence and relative abundance of polycyclic triterpenoids in R. rubrum varied with the …
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Revisiting polycyclic aromatic hydrocarbon emission in Photodissociation regions
… molecules made of carbon and hydrogen known as polycyclic aromatic hydrocarbons (PAHs). These molecules account for ~15% of the cosmic carbon and ~20% of the total IR power of the Milky Way and star-forming galaxies. They are strong absorbers of ultraviolet (UV) photons and release the absorbed …
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Dermal exposure to polycyclic aromatic hydrocarbons among workers
Contains fulltext : mmubn000001_180842978.pdf (Publisher’s version ) (Open Access)
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Lichens as biomonitors for atmospheric polycyclic aromatic hydrocarbons
… first time in Africa, studies investigating the polycyclic aromatic hydrocarbons (PAHs) levels in lichens (species Parmotrema austrosinense (Zalhbr.) Hale) was performed successfully using various sample preparation techniques. Sampling campaigns were conducted at 5 different sites across South …
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Studies of Polycyclic Aromatic Hydrocarbons in Urban Atmospheres
Polycyclic aromatic hydrocarbons (PAH) are known to exist in urban atmospheres and are suspected of carcinogenic potential. The implementation of emission control regulations and changes in fuel usage over the last twenty-five years has affected air quality in general and PAH concentrations in …
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Structures and absorption spectra of polycyclic aromatic compounds
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
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Preparation and properties of some polycyclic heterocyclic systems
Typewritten copy
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Synthesis and utility of electronically diverse polycyclic aromatics
… examines the synthesis of electronically diverse polycyclic aromatics within discrete molecular regimes and as incorporated into robust conjugated polymers. We have pursued two strategies for obtaining these large aromatics from rather elaborate yet readily available pendant aromatic precursors: …
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The synthesis of some new aromatic polycyclic hydrocarbons
… found to be carcinogenic, and more than 200 are polycyclic aromatic hydrocarbons, their derivatives and analogues. Recently a new polynuclear hydrocarbon, a seven ring compound naphtho[2,1-a]perylene was synthesized in This Laboratory Physiological tests have revealed this compound to be a potent …
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QUINODIMETHANES - AN EFFECTIVE STABILIZATION STRATEGY FOR POLYCYCLIC AROMATIC HYDROCARBONS
The union of a quinodimethane (QDM) core with a polycyclic aromatic hydrocarbon (PAH) framework led to the birth of a new class of quinoidal polycyclic/heterocyclic hydrocarbons (PHs) with numerous potential applications in materials chemistry. Over the years, intensive research efforts involving …
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Microbial degradation of high molecular weight polycyclic aromatic hydrocarbons
The bacterial degradation of high molecular weight PAHs was investigated by isolating communities and individual strains from a PAH-contaminated site. Microbiological analysis of soils from Port Melbourne, Australia, resulted in the enrichment of five microbial communities capable of degrading …
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Unique approaches towards the synthesis of polycyclic sesquiterpene targets
A programme of work towards the total synthesis of the natural product sesquithuriferone has been performed, with significant advances towards the realisation of this overall goal achieved. From this perspective, two main synthetic strategies have been investigated towards the synthesis of a common …
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