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Showing 1 to 20 of 36 for “"Thiophenes"”.
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Hydrodesulphurization of thiophenes using transition metal sulphides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Proposed Route to Cyclopenta[c]thiophenes via Activated Methylene
The synthesis of cyclopenta[c]thiophenes has been sparsely reported in the literature owing to several difficulties involved in their synthesis. The present work involves the proposed synthesis of cyclopenta[c]thiophenes and their precursors using activated methylene. Cyclopenta[c]thiophene …
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Studies on conducting polymers : the synthesis and anodic electropolymerisation of novel B-functionalised thiophenes
Following a brief review on conducting polymers, eight B-functionalised thiophene derivatives viz; trans-l,2-bis(3 ’-thienyl)ethene, [1]; trans-l-(l ‘-pyrenyl)-2-(3’’-thienyl)ethene, [2]; trans-l-(p-N,N-dimethylaminophenyl)-2-(3 ‘-thienyl)ethene, [3]; trans-l-(ferrocenyl)-2-(3 ‘-thienyl)ethene, …
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Synthesis, characterisation and application of low molecular weight and polymeric 1,3-di-2-thienylbenzo[c]thiophenes
… hole-transport property of triaryl amines and thiophenes as well as low band gap nature of isothianaphthene (ITN) moiety. The synthetic strategy is chosen in such a way to obtain low molecular weight and polymeric DTITNPDs. Low molecular weight DTITNPDs are synthesised by Pd-catalysed amination …
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The preparation of the thienobenzo [b] thiophenes and the synthesis of some W-(N, N-Dialkylamino) alkyl naphthyl sulfides
Thesis (M.S.)--Michigan State University of Agriculture and Applied Science. Dept. of Chemistry, 1961
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A Modified Route to Cyclopenta[C]Thophenes Via Grignard Reagents
The synthesis of cyclopenta[c]thiophenes is sparsely found in literature due to the several difficulties of their synthesis. Our research has shown that we could modify a previously known route to 1,3-disubstituted cyclopenta[c]thiophenes using traditional Grignard chemistry. Along the way we …
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The use of organotellurium heterocycles as precursors for novel organometallic compounds
… with organometallic reagents are described. Thiophenes have been used as models for organic sulfur in coal and their reactivity towards triiron dodecacarbonyl has been investigated. Reaction of unsubstituted thiophene with Fe3(CO)12 results in desulfurisation of the heterocycle, with the …
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The synthesis of liquid crystalline materials for organic semiconductor device applications
… based on a series of substituted dibenzothiophenes, thiophenes, [2,2']-bithiophenes, thieno[3,2-b]thiophenes, benzo-2,1,3-thiadiazoles and fluorenes have been synthesised. These materials incorporate photo-polymerisable (non-conjugated diene and methacrylate) and chemically-polymerisable …
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Thiophene and Derivatives for Use in Pyridazines and Thiapentalenes
… thiophene derivative complexes, and cyclopenta[c]thiophenes offer in the manufacturing of organic semiconductors. One area of thiophene research that has showed promise in leading to mass production of semiconductors derived from thiophene complexes is the use of thiophenes with electron …
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Transition Metal Complexes With Hydrosulfido and Thiophene Ligands
The removal of thiophenes and dibenzothiophenes from petroleum by catalytic hydrodesulfurization is becoming increasingly important to fossil fuel processing. The reaction mechanism of this process is proposed to involve thiophene coordination to the metal surface and subsequent hydrogen transfer …
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Thiophene derivatives of rhenium and titanium
… of the carbon-sulfur bond in condensed thiophenes, and (iii) the discovery of a new polymerization technique for the preparation of polythiophenes.
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Synthesis and characterisation of novel organic semiconductors
… of inorganic counterparts in electronic devices. Thiophenes are one of the most extensively studied and highly topical classes of electron-rich OSCs. Linked compounds are known for their photoluminescent and conducting properties. On the other hand, fused thiophenes (FTs), both as small molecules …
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Retention trends of chemical classes using CCl₄ as a carrier solvent in normal-phase HPLC
… compounds from eleven chemical classes (furans, thiophenes, aromatic hydrocarbons, ethers, esters, ketones, aldehydes, aromatic amines, azaarenes, alcohols and phenols) on three analytical silica-bonded phase (amino (NH₂), cyano (CN) and polar amino-cyano (PAC)) columns were investigated with …
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Photoelectrons and Recombining Electrons in Atomic and Molecular Systems
… molecules, acrolein and the singly halogenated thiophenes, due to resonant and non-resonant electron rescattering dynamics. In Chapters 5-6, the disentanglement of the valence electronic structure, as well as evidence for low-energy shape resonances, of the pyrimidine-type nucleobases, thymine, …
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Synthesis of polycyclic heteroaromatic compounds via the intramolecular [4+2] cycloaddition of conjugated hetarenynes and alkynes
… thermal conditions utilizing alkynylpyrroles, -thiophenes, or -furans tethered to alkynes. The hetarenyne cycloaddition substrates are readily prepared in 2-3 steps from commercially available or known 2- or 3-halohetarenes via Sonogashira coupling followed in most cases by a Mitsunobu reaction. …
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Organic Tracer Analyses and Receptor Modeling of PM2.5 in Fairbanks, Alaska
… organic species (hopanes, steranes, picene, and thiophenes) in Fairbanks PM2.5. These compounds have been reported to be found in emissions from combustion of various fossil fuels. The measured chemical composition of Fairbanks PM2.5 is compared to reported composition for PM2.5 in other air …
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Organic Tracer Analyses and Receptor Modeling of PM2.5 in Fairbanks, Alaska
… organic species (hopanes, steranes, picene, and thiophenes) in Fairbanks PM2.5. These compounds have been reported to be found in emissions from combustion of various fossil fuels. The measured chemical composition of Fairbanks PM2.5 is compared to reported composition for PM2.5 in other air …
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Thiarubrine production in roots and root cultures of Ambrosia chamissonis
… heterocyclic polyynes known as thiarubrines and thiophenes. They occur in all parts of the plant, especially in the roots and can be visualized in hand sections. Methods were developed for their isolation, purification and quantification. Plants were collected from various locations in B.C. and …
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Investigations of benzothienopyrans and related compounds
… of the resulting 2-alkenoyl-3- hydroxybenzo[b] thiophenes with hydrazine derivatives afford novel pyrazolidines. The preparation of 2,2-disubstituted benzothieno[2,3-b]- and [3,2-b]- pyrans has been investigated. The [2,3-b] isomers exist preferentially as their dienone valence tautomers. In the …
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Ab Initio Density Functional Theory Optimized Geometries of Vinyl Trialkylammonium, Vinylpyridinium and Vinyldiazonium Tetrafluoroborate Salts with Natural Bond Orbital Charge Distributions in the Gas Phase
… used to make 2,5-furans, -pyrroles, and -thiophenes. In an effort to expand the scope and synthetic utility of these valuable and versatile reagents and, more fundamentally, to understand better their electronic properties (and thus their reactivity), the first computational study of the …
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