
	Where results make sense

Topic: Thiophene

Related Topics

Pyrrole

Furan

Pyridine

Coronene

Benzonitrile

Biphenyl

Thioether

Organic compound

Organic chemistry

Hydrocarbon

Aromatic hydrocarbon

Styrene

Phenol

Heteroatom

Sulfur

In the News (Sun 29 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Thiophene - Wikipedia, the free encyclopedia
		Thiophene is an aromatic heterocyclic compound consisting of four carbon atoms and one sulfur atom in a five-membered ring.
		Related to thiophene are benzothiophene and dibenzothiophene, containing the thiophene ring fused with one and two benzene rings, respectively.
		Thiophene is used as a denaturant for ethanol with which it forms an azeotrope.
	en.wikipedia.org /wiki/Thiophene (522 words)

	The Photochemical Isomerization Reactions in Furan, Thiophene, and Pyrrole Derivatives
		The irradiation of the thiophene in gas phase yields ethylene, allene, methylacetylene, carbon disulphide, and vinylacetylene.
		Furthermore, in the photoisomerisation reaction of cyanothiophene derivatives, a Dewar thiophene was isolated and it showed to be an intermediate in the isomerisation reactions.
		When thiophene is used as starting material, only isomeric thiophenes were observed in an excited singlet state process, probably involving the formation of a Dewar thiophene, while no cyclopropenyl derivative was observed.
	www.netsci-journal.com /97v4/97015 (2854 words)

	Thiophene: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-12)
		Thiophene is a heterocyclic[For more facts and a topic of this subject, click this link] aromatic[Click link for more facts about this topic] organic compound organic compound quick summary:
		Thiophene is often found naturally occurring in petroleum petroleum quick summary:
		Thiophene is aromatic because one of the two electron pairs of the sulfur sulfur quick summary:
	www.absoluteastronomy.com /encyclopedia/t/th/thiophene.htm (565 words)

	Journal Publications
		The Lewis complex is then attacked by the thiophene, acting as a nucleophile, in a type of (Lewis) acid-catalyzed nucleophilic acyl substitution.
		Thiophene has a foul stench and is moderately toxic by inhalation.
		Care must be taken to ensure that the thiophene has been completely distilled over before changing from a heating mantle to a burner flame.
	courses.cvcc.vccs.edu /CHM_Bowman/journal_publications.htm (1313 words)

	Honors Research Colloquium - Abstracts (Site not responding. Last check: 2007-10-12)
		Due to their stability and structural planarity, thiophene and thiophene-based polymers are prominent among the candidates for a "conducting plastic;" moreover, the parent thiophene molecule is relatively easy to functionalize and a wide variety of thiophene derivatives are commercially available, thus making the synthesis of thiophene polymers straightforward, and, ultimately, cost-effective.
		However, optimum use of these thiophene polymers often requires n- or p-type doping, where electron donors or acceptors (respectively) are systematically incorporated into the base thiophene polymer to encourage/enhance conductivity without reacting irreversibly with adjacent thiophene moieties.
		In this vein, we have attempted to synthesize a p-doped thiophene polymer where the electron acceptor is a phenyl nitronyl nitroxide, a stable organic radical.
	students.washington.edu /hsap/hrc_abstracts.html (1889 words)

	Thiophene substituted antitumor antifolates - Patent 5260296
		The new thiophene substituted antifolate 1 is a very potent inhibitor of the enzyme dihydrofolate reductase, undergoes moderate polyglutamylation and is transported to tumor cells more effectively than methotrexate.
		This new thiophene substituted antifolate (1) and its close derivatives are envisioned to be anticancer and anti-inflammatory drugs exhibiting lower toxicity and enhanced specificity compared to methotrexate (MTX) and 10-deazaaminopterin (10-DAM).
		The new thiophene substituted antifolate 1 may be provided in composite forms to facilitate administration to patients or in dosage unit form.
	www.freepatentsonline.com /5260296.html (3224 words)

	Computational Chemistry problem answer (Site not responding. Last check: 2007-10-12)
		You were to compare the aromaticity of benzene with the aromaticities of three five-membered heterocycles: pyrrole, furan and thiophene.
		Sulfur, though, is not so electronegative; nevertheless thiophene is not terribly aromatic because sulfur's p-orbitals are much larger and more diffuse than carbon's, and so π-overlap is not terribly good.
		This is probably because the extent of π-overlap in thiophene is overestimated.
	www.bluffton.edu /~bergerd/classes/CEM311/Handouts/20050215cc.html (323 words)

	n-Type Thiophene Semiconductor Devices, Technology Transfer Program, Northwestern University
		Thiophene oligomers (nTs) and polymers (PTs) are known that operate as p-type semiconductors.
		The invention of n-type thiophene conductive materials (NU 21049) provides a means to such materials.
		The invention of an efficient preparation of n-type thiophene conductive materials (NU 21049) provides a means to meet the need for such materials in thin film deposition and related transistor and integrated circuit applications.
	ttp.northwestern.edu /abstracts/viewabs.php?id=65&cat=95 (437 words)

	WK2492- Determination of Trace Thiophene in Refined Benzene by Gas Chromatography and Sulfur Selective Detection
		This test method covers the determination of thiophene in refined benzene using gas chromatography and sulfur selective detection.
		The applicable concentration range will vary to some extent on user needs and the instrumentation used; however, in most cases the test method is applicable to the determination of thiophene at levels of 0.02 mg/kg to 2 mg/kg thiophene in benzene.
		This standard is needed to aid the measurement and agreement of thiophene specifications used in the commerce of benzene.
	www.astm.org /DATABASE.CART/WORKITEMS/WK2492.htm (138 words)

	Agilent \| Press Release
		Thiophene is a common sulfur impurity difficult to analyze at trace levels in benzene because its boiling point and molecular weight are similar to benzene.
		Until now, successful thiophene analyses in benzene have required expensive and complicated detectors.
		Further information is available by requesting Agilent application notes “Analysis of Trace (mg/kg) Thiophene in Benzene Using Two-Dimensional Gas Chromatography and Flame Ionization Detection,” Agilent publication 5988-9455EN, and “Fast Determination of Denatured Fuel Ethanol Purity by Two-Dimensional Gas Chromatography,” Agilent publication number 5988-9460EN.
	www.chem.agilent.com /scripts/Pressrel.asp?presskey=570&ll= (586 words)

	Common molecules #50820 - Reciprocal Net (Site not responding. Last check: 2007-10-12)
		Thiophene is a colorless liquid and is a cyclic aromatic compound.
		Thiophene is made from butane and sulphur and occurs as an impurity in commercial benzene.
		Alone, thiophene has a smell resembling benzene and is used as a solvent.
	www.reciprocalnet.org /recipnet/showsample.jsp?sampleId=27344635 (107 words)

	DNA Protein Cross-Links Produced by NSC 652287, a Novel Thiophene Derivative Active Against Human Renal Cancer Cells -- ...
		Thiophene NSC 652287 had no effect on purified DNA, which suggests that an active drug metabolite might be responsible for
		Thiophene NSC 652287 was selected for further characterization in part because of its behavior in the NCI's Drug Screening
		Carter CA, Waud WR, Plowman J and Alley MA (1996) In vivo spectrum of antitumor activity of a thiophene derivative.
	molpharm.aspetjournals.org /cgi/content/full/56/3/478 (4658 words)

	On Direct Iodination of Thiophene and Furan Derivatives in the Presence of Zeolites
		Direct Iodination of Thiophene and Furan Derivatives in the Presence of Zeolites
		Heterocyclic community, however, seem not to be involved very much into the exploration of new synthetic possibilities provided by these materials.
		Iododerivatives of thiophenes and furans are usually obtained via iododemetallation reaction [2] or via direct iodination of corresponding heteroaromatics in the presence of oxidants (mineral acids, mercury oxide) [3, 4].
	www.ch.ic.ac.uk /ectoc/echet98/pub/066 (252 words)

	Synthesis of 2-Acetylthiophene by the Acylation of Thiophene Using Acetic Anhydride and Iodine (A Revisiting after ...
		Thiophene is acetylated under mild conditions using acetic anhydride and iodine.
		This method was reported almost sixty years ago as part of a series of thiophene acetylation experiments involving various acetylating agents and various Lewis acid catalysts.
		While not originally conceived as a college laboratory exercise, this experiment is excellent for those wanting to include heterocyclic chemistry in their laboratory course.
	chemeducator.org /bibs/0009003/930163db.htm (163 words)

	[No title]
		\par We have reported the desulfurization of thiophene to form H}{\fs20\sub 2}{\fs20 S using propane as the exclusive hydrogen source on catalysts based on H-ZSM5 and cation-exchanged H-ZSM5 (M/H-ZSM5, M=Co, Fe, Mo, Zn) }{\field\fldedit{\\fldinst {\fs20 ADDIN ENRfu }{\fs20 {\\datafield 38003100450031003000300030004500300030003800430041003300360038003500360031003000300030003000380033003200430046003600350036004500370032003600360030003000330039003200300036004100350039003000300042003000450030003400360030003200300030003000300030003000300036 00300030003000300030003900310046003000320030003000300030003000300031004600350042003500390037003500320043003200300033003100330039003300390033003900320030003200330033003300330042003200300034004300360039003200430032003000360031003600330036003300360035003700 3000370034003600350036003400320030003200330033003400350044003000300030004100300030003000300030003000}}}{\fldrslt {\fs20 [2, 3]}}}{\fs20.
		We have shown that propane dehydrogenation can be coupled kinetically with hydrogenation reactions of thiophene or its fragments.
		\par Sulfur K-edge absorption spectra of spent catalyst sa mples from reactions of thiophene and propane mixtures on M/H-ZSM5 (M=Co, Fe, Mo, Zn) were recorded on beamline 6-2 using a He purge.
	www-ssrl.slac.stanford.edu /pubs/ar99/2569m315.rtf (463 words)

	Infrared Spectroscopy and Temperature-Programmed Desorption Study of Adsorbed Thiophene on -Al2O3
		-Al at 130 K, TPD reveals two peaks with maximum rates of desorption at 175 and ~220 K. The former peak is assigned to desorption of multilayer thiophene while the latter peak is assigned to desorption of weakly chemisorbed thiophene from the alumina surface.
		IR spectroscopy of adsorbed thiophene at submonolayer coverages provides further evidence that thiophene interacts only weakly with the alumina support; no decomposition of the thiophene overlayer is observed upon heating to 600 K under UHV conditions or a partial pressure of thiophene of 3.0 Torr.
		A direct correlation has been established between the IR and TPD data, permitting integrated extinction coefficients to be determined for adsorbed thiophene in both the monolayer and multilayer coverage regimes.
	pubs.acs.org /cgi-bin/abstract.cgi/langd5/1996/12/i06/abs/la950410e.html (277 words)

	Molecular cloning and sequence of the thdF gene, which is involved in thiophene and furan oxidation by Escherichia ...
		Molecular cloning and sequence of the thdF gene, which is involved in thiophene and furan oxidation by Escherichia coli.
		thiophenes as a result of mutations in several novel genes.
		Some of the genes involved in thiophene oxidation were cloned
	jb.asm.org /cgi/lookup?vol=173&fp=6018&view=abstract (427 words)

	Wiley::Thiophene and Its Derivatives, Volume 44, Part 3
		Thiophene and Its Derivatives, Volume 44, Part 2 (Hardcover)
		Thiophene and Its Derivatives, Volume 44, Part 4 (Hardcover)
		Thiophene and Its Derivatives, Volume 44, Part 5 (Hardcover)
	www.wiley.com /WileyCDA/WileyTitle/productCd-0471838330,descCd-emf_form.html (133 words)

	Synthesis of functionalized benzo[b]furans, thiophene and selenophene 4(a-e)
		The synthesis of 2-carboxaldehyde (or 2-acetyl) 3-phenylbenzo[b]furans, thiophene, selenophene has been performed starting from 3-bromo-2-carboxaldehydebenzo[b]furans, thiophene and selenophene 2(a-e) or from the 2-acetyl-3-trifluoromethylsulfonylbenzo[b]furans 3.
		Reaction of the carboxaldehydes 3(d-e) with Grignard reagent (CH MgI) in ether followed by the oxydation of the corresponding alcohols with PCC in dichloromethane afforded the 2-acetyl-3-phenylbenzo[b] thiophene and selenophene 6(d-e) in good yields (Scheme 4).
		The Stille and Suzuki cross-coupling reactions applied to 3-bromo-2-carboxaldehydebenzo[b]furans, thiophene and selenophene and to 2-acetyl-3-trifluoromethanesulfonylbenzo[b]furans have led to benzo[b]furans, thiophene and selenophene substituted by a phenyl group in the position 3 with good yields.
	www.ch.ic.ac.uk /ectoc/echet98/pub/079 (784 words)

	Amazon.com: Understanding corrosion inhibition: A surface science study of thiophene derivatives on iron surfaces in ... (Site not responding. Last check: 2007-10-12)
		Thiophene was selected based on previous work in UHV indicating a high thermal stability (∼520K) on the Fe(100) surface.
		Derivatives with functional groups with electron donating character (3-methylthiophene, 3-methoxythiophene) and electron withdrawing character (3-thiophenecarboxylic acid, 3-nitrothiophene) were chosen with the intent to probe how thermal stability and potential inhibition properties would be affected.
		In the ultra high vacuum study, thiophene, the reference molecule, was confirmed to be thermally stable up to 520K.
	www.amazon.com /exec/obidos/tg/detail/-/B000BIOFE8?v=glance (532 words)

	IngentaConnect Thiophene derivatives as effective inhibitors for the corrosion o... (Site not responding. Last check: 2007-10-12)
		IngentaConnect Thiophene derivatives as effective inhibitors for the corrosion o...
		Thiophene derivatives as effective inhibitors for the corrosion of steel in 0.5 m H
		The influence of thiophene and five of its substituted derivatives on the corrosion inhibition of steel in 0.5 m H
	www.ingentaconnect.com /content/klu/jach/2005/00000035/00000011/00009004 (259 words)

	Wiley::Thiophene and Its Derivatives, Volume 44, Part 2
		Wiley > Chemistry > Organic Chemistry > General Organic Chemistry > Thiophene and Its Derivatives, Volume 44, Part 2
		Thiophene and Its Derivatives, Volume 44, Part 3 (Hardcover)
		Thiophene and Its Derivatives, Volume 44, Part 2
	www.wiley.com /WileyCDA/WileyTitle/productCd-0471838322,descCd-emf_form.html (133 words)

	IngentaConnect Furoyl and thiophene carbonyl linker pyrazolyl palladium(II) comp... (Site not responding. Last check: 2007-10-12)
		Furoyl and thiophene carbonyl linker pyrazolyl palladium(II) complexes — Synthesis, characterization, and evaluation as ethylene oligomerization catalysts
		Oligomer distribution greatly depends on the oligomerization conditions; for example, an increase in temperature and pressure produced a higher percentage of C
		Key words: furoyl and thiophene carbonyl linker pyrazolyl compounds, palladium complexes, ethylene oligomerization.
	www.ingentaconnect.com /content/nrc/cjc/2005/00000083/F0020006/art00042 (396 words)

	D7011-04 Standard Test Method for Determination of Trace Thiophene in Refined Benzene by Gas Chromatography and Sulfur ...
		1.1 This test method covers the determination of thiophene in refined benzene using gas chromatography and sulfur selective detection.
		The test method is applicable to the determination of thiophene at levels of 0.02 to 2 mg/kg thiophene in benzene.
		It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
	www.astm.org /DATABASE.CART/REDLINE_PAGES/D7011.htm (294 words)

	3,3,4,4-tetrachloro tetrahydro thiophene 1,1-dioxide Use
		3,3,4,4-tetrachloro tetrahydro thiophene 1,1-dioxide - Pesticide use statistics for 2003
		Top crops and sites use of this chemical in 2003, with information on gross pounds used, application rate, acres planted, and number of applications.
		For detailed chemical information see the chemical detail page.
	www.pesticideinfo.org /Detail_ChemUse.jsp?Rec_Id=PC34556 (1005 words)

	Preparation and Photochemistry of Thiophene-S-oxides
		When substituting the methyl groups for more sterically demanding substituents such as tert-butyl as in 4, the reaction followed a different pattern and the oxygen was introduced into the heterocyclic ring system ultimately giving the furan 5 as a product (Scheme 2).
		Other compounds, such as 2,3,4,5-tetraphenylthiophene-S-oxide deoxygenate to give the corresponding thiophenes.
		This seemed to point towards the possibility of a bimolecular process in the photo-deoxygenation process, where large substituents at C-2 and/or C-5 would hinder the formation of an excited thiophene-S-oxide dimer and would induce the molecule to follow a different pathway.
	www.mdpi.org /ecsoc/ecsoc-5/Papers/a0050/a0050.htm (1828 words)

Try your search on: Qwika (all wikis)