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Topic: Pyrrole

Related Topics

Thiophene

Furan

Pyridine

Indole

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Biphenyl

Benzonitrile

Benzene

Organic chemistry

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Organic compound

Phenol

Alkane

Fischer indole synthesis

	Pyroluria and Kryptopyrrole Test, Urinary Pyrrole Laboratory Testing
		Direct Health Care Access II Laboratory is the leading expert in urinary pyrrole testing.
		Although not a definitive test for schizophrenia, the results indicated that the presence of elevated urinary kryptopyrrole is often associated with clinical conditions characterized by schizophrenic patients.
		Its cause is an inborn error in pyrrole chemistry, resulting in a dramatic zinc and vitamin B6 deficiency.
	www.kryptopyrrole.com (2040 words)

	Pyrrole
		In organic chemistry, a pyrrole is a five membered aromatic ring, 4 elements of which are carbon atoms, one element of which is a nitrogen atom.
		The molecular formula for a pyrrole is C
		Pyrroles are components of larger aromatic rings, including the porphyrins of heme, the chlorins and bacteriochlorins[?] of chlorophyll, and the corrin ring of vitamin B12.
	www.ebroadcast.com.au /lookup/encyclopedia/py/Pyrrole.html (59 words)

	PYRROLE
		Pyrrole: One of a class of organic heterocyclic compounds of five-membered diunsaturated ring structure composed of four carbon atoms and one nitrogen atom.
		The simplest member of the pyrrole family is pyrrole itself, a basic heterocyclic compound; colorless to pale yellow, toxic oil with pungent taste and similar to chloroform odor; insoluble in water; soluble in alcohol, ether, and dilute acids; boils at 129 - 131 C; polymerizes in light.
		Pyrrole and its derivatives are widely used as an intermediate in synthesis of pharmaceuticals, medicines, agrochemicals, dyes, photographic chemicals, perfumes and other organic compounds.
	www.chemicalland21.com /specialtychem/finechem/PYRROLE.htm (292 words)

	Media Portfolio
		Since these rings are bent out of planarity by the shape of the molecule, the double bonds in the six-membered rings do not mix their pi electrons to form an aromatic system, and buckminsterfullerene shows chemical reactivity characteristic of alkenes rather than aromatic compounds.
		Schematic of pyrrole and furan molecules showing p atomic orbitals on the ring atoms before these p orbitals merge to form a pi system.
		Pyrrole orients its nitrogen lone pair so that it becomes part of the developing pi system.
	wps.prenhall.com /wps/media/objects/724/741576/chapter_15.html (793 words)

	Ray's Articles - Criminal Behavior
		In some people, one specific pyrrole, 2,4-dimethyl-3-ethyl-pyrrole, is produced in excess (Jackson et al, 1997; Pfeiffer, 1975; Sohler et al, 1974).
		Pyrrole imbalance is a condition of the whole body with both physical and mental symptoms (Wenzel, 2000).
		Some specific behaviors and physical symptoms that have been associated with pyrrole imbalance are high internal tension, stress intolerance, unconstrained irritability, susceptibility to infection, fatigue, assaultive behavior, and abdominal pain, to name just a few (Edelman, 1996; Pfeiffer, 1975).
	www.nmrc.ca /criminal.htm (1025 words)

	The Photochemical Isomerization Reactions in Furan, Thiophene, and Pyrrole Derivatives
		The photochemical behaviour of furan, thiophene, and pyrrole derivatives appears to be very complex and, apparently, no common description of the reactivity of these heterocycles is possible.
		The irradiation of furan derivatives in propylamine led to the formation of the corresponding pyrrole.
		To confirm these experimental data, Dewar pyrrole, generated by photofragmentation of a suitable substrate, showed to be very unstable in comparison to similar compounds obtained with furans or thiophenes.
	www.netsci-journal.com /97v4/97015/index.htm (2854 words)

	Furan and thiophene have structures analogues to the
		Pyrrole is reduced by zinc and acetic acid to pyrroline (2,5
		Pyrrole is a week acid whose conjugated base is stabilize by delocalization of negative charge.
		Pyrrole react rapidly with halogens, with iodine in KI or
	www.kaau.edu.sa /KBADAHDAH/lecture232twelv.htm (697 words)

	Pyrrole (Site not responding. Last check: 2007-10-29)
		The chemical structure of Pyrrole is shown at the right.
		This is a graph of the molar extinction coefficient of Pyrrole dissolved in hexane.
		Pyrrole has a molar extinction coefficient of 15,000 M
	omlc.ogi.edu /spectra/PhotochemCAD/html/pyrrole.html (136 words)

	ECSOC
		In two of these mechanisms the central decisive step for the building of the pyrrole ring is the formation of the carbon-carbon bond between C3 of one 5-aminolevulinic acid (12) reacting as a nucleophile and the keto function of the other 5-aminolevulinic acid.
		For the Knorr pyrrole synthesis the steps leading to the pyrrole nucleus are the same, but the sequence is clearly different from the Shemin mechanism for the biosynthesis.
		The reaction conditions for the pyrrole formation are sufficiently mild to allow also the isolation of highly sensitive pyrroles.
	www.unine.ch /chim/ecsoc-2/ECSOC-04.html (992 words)

	Process for preparing (+)-2,3-Dihydro-1H-pyrrolo[1,2-a]pyrrole-1-carboxylic acid and related compounds - Patent 4874871
		The starting pyrrole and compounds of formula XI, the products of formula IX, and the intermediates of formulae X and XII, may be isolated and purified, if desired, using conventional techniques, including but not limited ot filtration, distillation, crystallization, chromatography, and the like.
		Pyrrole (Eastman, distilled over CaH.sub.2, 0.60 g, 8.95 mmol) and tetrahydrofuran (distilled over sodium, 20 mL) were added to a 100 mL flask containing a stirrer bar, under strictly anhydrous conditions, and the flask cooled in an ice bath.
		Pyrrole (Eastman, distilled over CaH.sub.2, 1.49 g, 22.2 mmol) and tetrahydrofuran (distilled over sodium, 30 mL) were added to a 100 mL flask containing a stirrer bar, under strictly anhydrous conditions, and the flask cooled in an ice bath.
	www.freepatentsonline.com /4874871.html (3501 words)

	Reinhard Neier (4)
		The isolation of the pyrroles in pure form proved to be delicate.
		The yield of pyrrole obtained by reduction was extremely low for the annelated pyrroles.
		The reaction conditions for the pyrrole formation are sufficiently mild to allow the isolation of highly sensitive pyrroles.
	www.ch.ic.ac.uk /ectoc/echet96/hyperwave/000002c1.html (1535 words)

	[No title]
		Thus, the N (blue) of pyrrole is sp
		The electrons (red) on this N are in a p orbital that is part of the cycle of p orbitals.
		As a result, pyrrole is a planar molecule with a cycle of p orbitals that extends completely around the ring and that contains 6 electrons, so it is aromatic.
	www.du.edu /~jhornbac/organic/pyrrole.html (131 words)

	Project 3: Lamellarin Synthesis and Regioselective Polycoupling Reactions
		These marine alkaloids are characterized by the presence of a pentacyclic structure with a pyrrole at the core.
		Among the advantages of such an approach are the convergent nature of the synthesis, the ability to access considerable variation in the aryl ring substitution patterns by simply changing the boronic acids employed, and the ability to access analogs that lack one or both of the tethers in the pentacyclic core.
		Such a protection can be difficult in very electron-deficient (and thus non-nucleophilic) pyrroles, which led to the discovery that iodoformates can be generated in situ and used to protect these very non-reactive substrates.
	www.chem.binghamton.edu /HANDY/npsynthpage.htm (1228 words)

	Division of Mathematics and Natural Sciences: Biology, Chemistry, Mathematics, Physics
		Neat pyrrole solutions were generally used to form thick films of polypyrrole. Here, the pyrrole is used both as the polymerization species and the solvent. This polymerization route was first studied by Murray and coworkers
		electrode in 10% pyrrole (by volume) 0.1 Et solution at a scan rate of 50 mV/sec demonstrating a) nucleation of polypyrrole and b) polypyrrole growth after 20 cycles.
		These polymers were grown by cycling the electrode in a 10% pyrrole / acetonitrile solution between 0.0 and 1.0-1.3 Volts vs. Ag wire. Illustration 3.3 has polypyrrole nodules that are roughly 10-20 mm in diameter, interestly about the same size as the underlying superconductor grains.
	www.bpc.edu /mathscience/faculty/jones/chapter_3_02.html (470 words)

	Heteroaromatics - Chemistry (Site not responding. Last check: 2007-10-29)
		As for pyrrole the energy match and orbital overlap between the N-centred p-orbital and the adjacent C-centred p-orbitalsis relatively poor so the resonance energy is lower than for benzene: 117 kJmol-1 cf.
		Non basic; as for pyrrole, the N lone pair is involved in aromatic system protonation occurs at C3 (as for enamine)
		Diazoles could be considered as related to pyrrole but with a N replacing a CH group.
	chemistry.tidalswan.com /index.php?title=Heteroaromatics (656 words)

	Pyrrole polymers as electrical heating elements (US4587037)
		Moldings from the class of the pyrrole polymers which are complexed with anions are used as electrical heating elements.
		a molding of a pyrrole polymer which has been complexed with anions, said molding being shaped to the desired dimensions of the heating element; and
		Pyrrole, a Stable Metallic Polymer; Kanazawa et al., J. Chem.
	www.delphion.com /details?pn10=US04587037 (104 words)

	handprint : synthetic organic pigments
		In contrast, cool indanthrone and the warm pyrroles are typically opaque and heavily staining too.
		All the pyrroles are nontoxic, extremely lightfast, semitransparent to semiopaque, and staining.
		They are very attractive substitutes for cadmium pigments in the same hues, as the mixing range of the DPP pigments is much broader than the cadmiums — though for the orange and scarlet hues, the saturation is less.
	www.handprint.com /HP/WCL/pigmt1d.html (4436 words)

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