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Topic: Electrophile

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	purevolume™ \| electrophile (Site not responding. Last check: 2007-11-06)
		Electrophile was formed in June of 2003 by Patrick Hogan and Sandor Gavin with one goal in mind: to take the electronic music they both loved out of the studio and on to the stage.
		Electrophile combines elements of synthpop, EBM, retro, and industrial music.
		Influenced by a wide variety of artists such as Assemblage 23, Iris, Information Society, and Depeche Mode, they have managed to create a very fluid electronic sound that is uniquely their own.
	www.purevolume.com /electrophile (113 words)

	Electrophile Summary
		Among the reactions involving electrophiles are electrophilic addition to multiple bonds (alkenes and alkynes), reactions with alkanes (as rearrangements, free radical halogenation, and reactions with peracids), and electrophilic aromatic reactions (such as Friedel-Crafts alkylation and acylation).
		Electrophilic addition to a multiple bond is one example of the use of the proton as an electrophile.
		Most electrophiles are positively charged, have an atom which carries a partial positive charge, or have an atom which does not have an octet of electrons.
	www.bookrags.com /Electrophile (1258 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		Electrophile means "electron loving" and therefore they accept electron density from nucleophiles in chemical reactions.
		Because electrophiles seek electrons, they themselves are any species that have a positive charge or a partial positive charge.
		The beauty of this generalization is that any bond formed in a reaction is the combination of an electrophile and a nucleophile.
	www.odu.edu /sci/jadamski/n12d.htm (190 words)

	Proceedings of the Oklahoma Academy of Science
		The two pages can be juxtaposed in order to visualize the mechanisms of reactions of nucleophiles and electrophiles common to organic chemistry and to facilitate remembering and differentiating (a) the electrophiles and nucleophiles, (b) the active site(s) in each, and (c) the arrow(s) designating the flow of electrons in the reaction of the two.
		Each electrophile in the "E or E+" column has a head half of an arrow leading from the side of the page and pointing to an atom which is the reactive site in the electrophile, usually the atom bearing the highest amount of positive charge.
		Attack by the aromatic compound upon a general electrophile E+ is shown in the left one-third of Sheet B, with arrows leading from the aromatic compound to E+.
	digital.library.okstate.edu /OAS/oas_htm_files/v80/p71_78.html (2934 words)

	Structure of Benzene
		The reagent - catalyst - electrophile - product pattern works well when the aromatic compound is benzene itself, but things become more complicated when a substituted benzene (a molecule in which one of the hydrogens of benzene has been replaced by another atom or group) is used.
		Electrophilic attack will be faster at positions such that the carbocations produced have positive charges on carbons which are bonded to electron donating groups like methy groups.
		The underlying idea in the forgoing analysis of directive effects in electrophilic was understanding the relative rates of reaction when the competition was between different sites in the same molecule.
	chemistry2.csudh.edu /rpendarvis/ElAromSubst.html (1495 words)

	Electrophilic Aromatic Substitution
		In electrophilic aromatic substitution, the benzene ring acts as an electron donor (Lewis base or nucleophile) and reacts with an electron acceptor (Lewis acid or electrophile).
		The result of electrophilic aromatic substitution reactions is that an aromatic hydrogen is replaced by some other atom or functional group.
		Electrophilic substitutions are favored by electron-donating groups which stabilize the carbocation intermediate.
	www.chem.latech.edu /~deddy/chem252/EAS.htm (1241 words)

	Modifying specific cysteines of the electrophile-sensing human Keap1 protein is insufficient to disrupt binding to the ...
		Native EMSA of Keap1 and Neh2 with Keap1 incubated with various Michael reaction acceptor electrophiles alone or in the presence of Neh2.
		Keap1 by the irreversible-binding electrophiles CDNB and BIA.
		Upon introduction of electrophiles, modification of Keap1 C151 leads to a change in the conformation of the BTB domain by means of perturbing the homodimerization site, disrupting Neh2 ubiquitination, and causing ubiquitination of Keap1.
	www.pnas.org /cgi/content/full/102/29/10070 (5212 words)

	electrophilic substitution - the sulphonation of benzene (Site not responding. Last check: 2007-11-06)
		This page gives you the facts and a simple, uncluttered mechanism for the electrophilic substitution reaction between benzene and sulphuric acid (or sulphur trioxide).
		The sulphur trioxide electrophile arises in one of two ways depending on which sort of acid you are using.
		The second stage of the reaction involves a transfer of the hydrogen from the ring to the negative oxygen.
	www.chemguide.co.uk /mechanisms/elsub/sulphonation.html (262 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		Consider the electrophilic addition of H-Br to 2-butene: The alkene abstracts a proton from the HBr, and a carbocation and bromide ion are generated.
		Borane is an electrophilic molecule, and reacts with double bonds in a one step process to generate an alkylborane.
		An electrophile (H+) adds electrophilically to the double bond, and the carbocation is attacked by another alkene double bond.
	crab.rutgers.edu /~alroche/Ch08.doc (3142 words)

	Additions to Alkenes
		These steps -- first an electrophile attacks the pi bond to form a carbocation, second a nucleophile attacks the carbocation -- are the key steps in the most important reactions of alkenes, electrophilic addition reactions.
		is thus the electrophile and the Br is the nucleophile.
		One of the bromine atoms is acting as an electrophile.
	chemistry2.csudh.edu /rpendarvis/AlkeneAddn.html (1583 words)

	www.myspace.com/electrophile
		Electrophile also strives to create a unique and memorable live performance that sets itself apart from other live acts.
		To Date, Electrophile has performed with such notable acts as Bella Morte, Faith and the Muse, and has headlined "Movement 04" (formerly the Detroit Electronic Music Festival) one of the largest electronic music festivals in the world.
		Electrophile is currently booking a regional tour in the Midwest.
	www.myspace.com /electrophile (576 words)

	CD Baby: ELECTROPHILE: Fluid
		Electrophile was formed in June of 2003 by Patrick Hogan and sandor Gavin with one goal in mind.
		After forming electrophile sandor and Patrick quickly enlisted the talents Of Rayne for her southing vocal styles completing the acts onstage lineup.
		Electrophile quickly wrote heart of stone and several of there more memorable tracks and released them on 2003's digital emotion ep for there first show.
	cdbaby.com /cd/electrophile (368 words)

	Chemistry 211 Experiments
		We used an electrophilic aromatic substitution (EAS) reaction to nitrate methyl benzoate.
		As long as the cation is stable, and cannot rearrange, this is a good way to generate the electrophile for a Friedel-Crafts alkylation.
		The terminal nitrogen of the diazonium cation is used as an electrophile in an EAS reaction.
	www.miracosta.edu /home/dlr/211exp.htm (1515 words)

	C 2131 Electrophilic Aromatic Substitution Reactions
		The characteristic reactions of aromatic compounds are the electrophilic aromatic substitution reactions.
		The major differences are that the electrophile involved must be a very strong electrophile (very electron deficient) and that the aromatic ring must be regenerated in the final step of the reaction.
		energetically speaking, the transition state corresponds to the attack on the electrophile, there is a slight trough where the resonance stabilized carbocation intermediate resides, another transition state as the proton is abstracted and finally a plateau corresponding to the final product.
	www.mta.ca /~acockshu/c2131aromsubst.html (1395 words)

	ELECTROPHILIC SUBSTITUTION REACTIONS
		It is these pi-electrons that are responsible for electrophilic substitution reactions of benzene.
		In these types of reactions, an electrophile attacks the pi-system of benzene to yield a delocalized carboncation known as arenium ion or a
		This breaks the cyclic system of pi-electrons, because when arenium ion is formed, one carbon (the carbon that is attacked by electrophile) becomes sp3-hybridized.
	www.citycollegiate.com /benzene_reaction1.htm (153 words)

	Catalase has a novel protective role against electrophile killing of Xanthomonas -- Vattanaviboon et al. 147 (2): 491 ...
		Kat1 is responsible for resistance to electrophile killing.
		Growth and electrophile killing conditions were as described in Methods.
		Importance of RpoS and Dps in survival of exposure of both exponential- and stationary-phase Escherichia coli cells to the electrophile N-ethylmaleimide.
	mic.sgmjournals.org /cgi/content/full/147/2/491 (3169 words)

	Ans6 (Site not responding. Last check: 2007-11-06)
		C6H5CH2O2CCH3 is the electrophile, CN- is the nucleophile, with C as the nucleophilic atom.
		CH3CH2OH is the electrophile (note this is an acidic solution); I- is the nucleophile and H2O is the leaving group.
		CH3CH2I is the electrophile; P(CH2H5)2 is the nucleophile (with P being the nucleophilic atom); I- is the leaving group
	www2.tltc.ttu.edu /headley/Ans6.htm (309 words)

	Chemistry 211 Experiment 1
		In many cases, the Friedel-Crafts electrophile is generated using a chlorine-containing molecule (e.g., an acyl [acid] chloride or an alkyl chloride) and an appropriate Lewis acid (e.g., AlCl
		As long as the carbocation is stable, and does not undergo rearrangements, this is actually a very good way to generate an electrophile for a Friedel-Crafts alkylation reaction.
		The t-butyl cation, which is used as the electrophile in this reaction, is a 3° carbocation which cannot rearrange, so it works quite well.
	www.miracosta.edu /home/dlr/211exp1.htm (1115 words)

	Explaining the industrial alkylation of benzene - electrophilic substitution
		This page guides you through the mechanisms for the electrophilic substitution reaction between benzene and alkenes in the presence of a mixture of aluminium chloride and hydrogen chloride as catalysts.
		If you are going to insert an CH group onto the ring, then the electrophile must be CH The electrophile is formed by reaction between the ethene and the HCl - exactly as if you were beginning to add the HCl to the ethene.
		Because the electrophile has the positive charge on the centre carbon, that will be where it attaches to the benzene ring.
	www.chemguide.co.uk /mechanisms/elsub/indalkyltt.html (847 words)

	elec_nuc.html
		Therefore identification of electrophiles and nucleophiles is a critical organic chemistry survival skill.
		Because electrons flow from an electron source to a place of electron deficiency, a curved arrow points away from a nucleophile and to an electrophile.
		Because nucleophile must react with an electrophile that leaves the other molecule (a chlorosulfite ester) to be the electrophile.
	web.chem.ucla.edu /~harding/tutorials/elec_nuc/elec_nuc.html (872 words)

	Biology 403: Enzyme Mechanisms
		We conventionally discuss the reaction as an attack by the nucleophile on the electrophile, and we conventionally draw this attack by showing the nucleophile donating its electron to the electrophile, as shown in schemes 6.1 and 6.2 in Horton.
		Catalysis by a general base is illustrated in scheme 6.7, in which a general base (shown as :B in the scheme) donates an electron pair to extract a hydrogen from an electrophile, converting the base to its positively-charged conjugate acid and leaving a negative charge on the former electrophile.
		Catalysis by a general base is shown in scheme 6.8 for cleavage of an amide (peptide) bond; here the intermediate is tetrahedral, and involves a carbon atom with two oxygens and a nitrogen bonded to it.
	www.csrri.iit.edu /~howard/biol403/enzymemechanisms.html (1510 words)

	Nucleophile vs Electrophile
		A very basic definition would be species with a lot of electon density tend to be nucleophilic, species that are electron deficient tend to be electrophilic.
		The oxygen, although it has a positive charge, is actually not a very good electrophile because there is still a lone pair of electron on the oxygen and all the bonds between oxygen and H (or C) are polarized towards oxygen (since it is very electronegative).
		The hydrogens are more electrophilic because of the bond polarization (electrons are "closer" to oxygen than hydrogen) and the hydrogen is less encumbered by sterics.
	www.chemicalforums.com /index.php?topic=1142.msg4980 (468 words)

	Electrophile
		An Electrophile is a chemical species that is electron-deficient.
		In addition to the electrophiles above which carry a full positive charge, some molecules, for example, Br and HBr, are electrophilic.
		Hydrogen bromide, generated by the action of concentrated sulphuric acid on sodium bromide, reacts rapidly with alkenes at room temperature yielding the halogenoalkane.
	www.avogadro.co.uk /definitions/electrophile.htm (193 words)

	Electrophile Problem
		Which of the following molecules and ions are electrophilic?
		Enter your selections in the answer box (type in the appropriate letter for each choice).
		This script written by William Reusch, Dept. of Chemistry, Michigan State University.
	www.cem.msu.edu /~reusch/VirtualText/Questions/Match/match6.htm (49 words)

	ELECTROPHILE- NUCLEOPHILE - BASICITY - ACIDITY - pH SCALE
		ELECTROPHILE- NUCLEOPHILE - BASICITY - ACIDITY - pH SCALE
		Any species, which accepts a pair of electrons, called electrophile
		Any species, which donates a pair of electron, is called Nucleophile
	www.citycollegiate.com /acidbasesalt4.htm (180 words)

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