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Topic: Rearrangement reaction

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	Chemistry - Chemical reaction
		A chemical reaction or is a reaction of two or more chemicals (reagents), yielding a chemical change and a product(s).
		In a rearrangement reaction, the atoms and bonds within a molecule rearrange to form an isomer of the original compound.
		In an oxidation-reduction reaction (also known as a redox reaction), one reactant loses electrons (that is, it is oxidized), and the other reactant gains electrons (it is reduced).
	www.chemistrydaily.com /chemistry/Chemical_reactions (818 words)

	Chemical reaction - Wikipedia, the free encyclopedia
		Nuclear reactions are not considered chemical reactions, although chemical reactions may follow a nuclear transformation.
		The enthalpy of a reaction is calculated using standard reaction enthalpies and Hess' law of constant heat summation.
		Reaction rates are related to the concentrations of substances involved in reactions, as quantified by the law of mass action.
	en.wikipedia.org /wiki/Chemical_reaction (1265 words)

	Chemical reaction
		In an oxidation-reduction reaction (also known as a redox reaction), one reactant loses electrons (that is, it is oxidized), and the other reactant gains electrons (it is reduced).
		For example, consider the reaction CH → CO O (combustion of methane in oxygen).
		A reaction may have a positive ΔH. This means that, to proceed, the reaction requires an input of energy from outside.
	www.sciencedaily.com /encyclopedia/chemical_reaction (704 words)

	Encyclopedia: Chemical reaction (Site not responding. Last check: 2007-10-17)
		Combustion or burning is an exothermic reaction between a substance (the fuel) and a gas (the oxidizer) to release heat.
		Rates of reaction depends basically on: The reaction rate for a reactant or product in a particular reaction is defined as the amount (in moles or mass units) per unit time per unit volume that is formed or removed.
		A spontaneous process in chemical reaction terms is one which occurs with the system releasing free energy in some form (often, but not always, heat) and moving to a lower energy, hence more thermodynamically stable, state.
	www.nationmaster.com /encyclopedia/Chemical-reaction (2470 words)

	Patent 5225547: Reaction accelerator for rearrangement of oxime to amide and process for producing amides by ...
		Rearrangement of an oxime to an amide is known as Beckmann rearrangement.
		The method of rearranging an oxime using the reaction accelerator of this invention is generally preferably effected by feeding to a reactor a solution of the above-mentioned oxime and reaction accelerator in a solvent and subjecting them to reaction at a predetermined temperature.
		When the reaction accelerator is a solid which is not dissolved in a solvent, the reaction is effected in the state that the reaction accelerator is suspended in the solvent or effected in a flow reactor in which the reaction accelerator is present in the form of a fixed layer.
	www.freepatentsonline.com /5225547.html (3938 words)

	LECTURE 4
		Definition: The reactions in which the carbon skeleton of the molecule is rearranged to give a structural isomer of the original molecule are known as rearrangement reactions.
		A classical example of Molecular Rearrangement reaction is shown by the five membered cyclic transition state of acetoxyl groups in solvolytic reaction of benzoyl ephedrine.
		Thermal Rearrangements - Many reactions involving high temperature often go by formation of radicals and ions but rearrangement reactions have been carried out in the vapour phase, so it is unlikely that the reaction involves dissociation of the starting material into fragments such as radicals or ions.
	www.uiowa.edu /intlinet/unijos/departments/pharmacology/rearrangment.htm (593 words)

	TMPh A. V. Bogdanov, A. S. Gevorkyan, A. I. Denisenko, G. V. Dubrovskii - Quasi-classical analytical approximation of ... (Site not responding. Last check: 2007-10-17)
		Quasi-classical analytical approximation of the $S$-matrix for the three-particle collinear rearrangement reaction
		In the framework of the quasi-classical method of the Fock–Leontovich parabolic equation, the collinear problem of the three-particle rearrangement reaction is reduced to the quantum problem of a one-dimensional harmonic oscillator with a variable frequency in an external force field.
		This allows one to express the $S$-matrix elements responsible for the rearrangement channel via the known analytical functions of the oscillator model, using the parameters of the potential surface of a linear configuration of three particles.
	math.ras.ru /tmph/scripts/tmph2.cgi?paperinfo=351 (130 words)

	Rearrangement
		Rearrangement to a 2º-carbocation is favored by relief of small-ring strain in the case of pinene, and relief of steric congestion in the case of camphene.
		Reactions # 6 & # 7 are interesting cases in which water is absent during the formation and reaction of the isocyanate.
		The rearrangement of acyl nitrenes to isocyanates that is the crux of the Hofmann, Curtius and Lossen rearrangements, is paralleled by the rearrangement of acyl carbenes to ketenes, a transformation called the Wolff rearrangement.
	www.cem.msu.edu /~reusch/VirtualText/rearrang.htm (7064 words)

	Chemical reaction - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-17)
		Chemical reactions are also known as chemical change s.
		Such reactions can result in molecules attaching to each other to form larger molecules, molecules breaking apart to form two or more smaller molecules, or rearrangements of atom s within molecules.
		A catalyst increases the speed of a reaction by lowering the activation energy needed for the reaction to take place, and supplies enough energy for the reaction to happen.
	encyclopedia.worldsearch.com /chemical_reaction.htm (786 words)

	Process for the preparation of Îµ-caprolactam - US Patent 5900482 (Site not responding. Last check: 2007-10-17)
		The method according to claim 1, wherein the cyclohexanone oxime is subjected to the Beckmann rearrangement reaction in sulfuric acid or fuming sulfuric acid to obtain Îµ-caprolactam sulfate.
		The temperature for the reaction is preferably low from the viewpoint of the equilibrium in the hydration reaction of cyclohexene or the prevention of side reactions and high from the viewpoint of the reaction rate.
		The oxime-forming reaction is not limited to the reaction with hydroxylamine, and cyclohexanone oxime may be obtained, for example, by a method wherein cyclohexanone is reacted with nitrogen monoxide and hydrogen in the presence of a platinum group catalyst (U.S. Pat.
	www.patentstorm.us /patents/5900482.html (3335 words)

	Named Reactions
		A ** indicates a new or updated entry.
		If you would like to add a named reaction and/or an example, or comment on any of them, please send it to the email address shown.
		Claisen rearrangement (Johnson variant or ortho ester variant)
	orgchem.chem.uconn.edu /namereact/named.html (42 words)

	Chemical Reactivity
		Substitution reactions, as the name implies, are characterized by replacement of an atom or group (Y) by another atom or group (Z).
		Useful information about reaction mechanisms may be obtained by studying the manner in which the rate of a reaction changes as the concentrations of the reactant and reagents are varied.
		A reaction mechanism should include a representation of plausible electron reorganization, as well as the identification of any intermediate species that may be formed as the reaction progresses.
	www.cem.msu.edu /~reusch/VirtualText/react1.htm (4203 words)

	Patent 4806638: Neutralization of reaction mixtures obtained by Beckman rearrangement of cyclohexanone oxime
		The Beckmann rearrangement reaction of cyclohexanone oxime with sulfuric acid or oleum gives a reaction mixture which essentially consists of crude caprolactam (crude lactam) and sulfuric acid.
		It is an object of the present invention to provide a process for the neutralization of reaction mixtures from the Beckmann rearrangement reaction, in which gaseous ammonia is fed in during the neutralization without difficulties and uniform neutralization of the reaction mixture is ensured.
		Gaseous ammonia is introduced into the solution of the reaction mixture in the ammonium sulfate mother liquor through a plurality of nozzle orifices, for example from 50 to 2,000 nozzle orifices per m.sup.2, the orifices having a diameter of from 1 to 5 mm.
	www.freepatentsonline.com /4806638.html (1983 words)

	Proton Transfer from Histidine 244 May Facilitate the 1,2 Rearrangement Reaction in Coenzyme B12-dependent ...
		reactions is the homolytic cleavage of the cobalt-carbon bond
		Alternative pathways for the rearrangement of a methylmalonyl-CoA radical involving a carbonium ion intermediate ( a), a carbanion intermediate ( b), direct rearrangement ( c), dissociative or fragmentation pathway ( d), and an organocobalt intermediate ( e).
		during the rearrangement reaction from interception by oxygen.
	www.jbc.org /cgi/content/full/274/46/32733 (3532 words)

	General Chemistry Online: Glossary:
		For example, the reaction quotient for A + B = C + D is equal to (C)(D) / ((A)(B)), where the parentheses indicate concentrations.
		A reaction rate is the speed at which reactants are converted into products in a chemical reaction.
		The reaction rate is given as the instantaneous rate of change for any reactant or product, and is usually written as a derivative (e.
	antoine.frostburg.edu /chem/senese/101/glossary/r.shtml (888 words)

	APPLICATION OF POLYMERASE CHAIN REACTION TO DETECT REARRANGEMENT OF IMMUNOGLOBULIN HEAVY CHAIN (Site not responding. Last check: 2007-10-17)
		All seven cases of follicular lymphomas we have studied were of paraffin-embedded lymph node tissues and all have demonstrated Bcl-2 gene rearrangement of the major breakpoint by PCR amplification and hybridized with a specific probe which is detected by chemiluminescence technique.
		Detection of immunoglobulin gene rearrangement in B-cell neoplasms by polymerase chain reaction gene amplification.
		Detection of immunoglobulin gene rearrangements in B lymphoid malignancies by polymerase chain reaction gene amplification.
	www.kfshrc.edu.sa /annals/174/96-299r.html (2683 words)

	B-Cell Pulmonary Lymphoma: Gene Rearrangement Analysis of Bronchoalveolar Lymphocytes by Polymerase Chain Reaction -- ...
		Sklar, J, Longtine, J (1992) The clinical significance of antigen receptor gene rearrangements in lymphoid neoplasia.
		Deane, M, Norton, JD (1990) Detection of immunoglobulin gene rearrangement in B lymphoid malignancies by polymerase chain reaction gene amplification.
		Kavuru, MS, Tubbs, R, Miller, ML, et al (1992) Immunocytometry and gene rearrangement analysis in the diagnosis of lymphoma in an idiopathic pleural effusion.
	www.chestjournal.org /cgi/content/full/115/5/1242 (2437 words)

	Beckmann rearrangement (Site not responding. Last check: 2007-10-17)
		The rearrangement of an oxim to the amide in conc.
		The oxime is formed by the reaction of a keton with Hydroxyamine.
		The caprolactam is hydrolysed and the polymerized to Nylon.
	www.eurofreehost.com /be/Beckmann_rearrangement.html (123 words)

	Rearrangement of a 1,3-trans-{Pt(NH3)2[(GXG)-N7G,N7G]} intrastrand cross-link into interstrand cross-links within RNA ...
		Boudvillain,M., Dalbiès,R., Aussourd,C. and Leng,M. (1995) Intrastrand cross-links are not formed in the reaction between transplatin and native DNA: relation with the clinical inefficiency of transplatin.
		Colombier,C., Boudvillain,M. and Leng,M. (1997) Interstrand crosslinking reaction in transplatin-modified oligo-2'-O-methyl ribonucleotide-RNA hybrids.
		Dalbies,R., Boudvillain,M. and Leng,M. (1995) Linkage isomerization reaction of intrastrand cross-links in trans-diamminedichloroplatinum(II)-modified single-stranded oligonucleotides.
	nar.oupjournals.org /cgi/content/full/30/23/5222 (3605 words)

	D
		The term includes both "degenerate intramolecular rearrangements" and reactions that involve intermolecular transfer of atoms or groups ("degenerate intermolecular rearrangements"): both are degenerate isomerizations.
		When equilibrium is reached in a reaction system (containing an arbitrary number of components and reaction paths), as many atoms, in their respective molecular entities, will pass forward, as well as backwards, along each individual path in a given finite time interval.
		Accordingly, the reaction path in the reverse direction must in every detail be the reverse of the reaction path in the forward direction (provided always that the system is at equilibrium).
	www.chem.qmw.ac.uk /iupac/gtpoc/D.html (1080 words)

	The Twin Excited State as a Probe for the Transition State in Concerted Unimolecular Reactions: The Semibullvalene ...
		The twin state concept is depicted in Figure 1 for a degenerate rearrangement reaction of two mirror image molecules, represented by corresponding VB structures which differ solely by bond shift.
		As the system moves along the reaction coordinate, Q, it is assumed that the wave function may be expressed as a linear combination, eq.
		rearrange during the reaction, the ground state electronic wave function transforms as the totally symmetric irreducible representation of the molecular point group.
	chem.ch.huji.ac.il /employee/haas/paper2/SEMIB.HTM (2373 words)

	Lancaster for Academics (Site not responding. Last check: 2007-10-17)
		Results of an investigation on the influence of phenol substituents differing by their inductive effect, on the catalytic wet oxidation of phenol, 2-aminophenol, salicylic acid and 5-sulfosalicylic acid performed in a laboratory trickle bed reactor.
		A study of the Diels-Alder reaction of phenyl sulfonyl acetylene with furan and pyrrole derivative.
		Description of the Mitsunobu reaction which performs a stereospecific conversion of an alcohol to primary amine with inversion of configuration.
	www.lancastersynthesis.com /content/body_reaction.html (1490 words)

	Raman Study of Solid State Reactions - Storming Media
		The thermal rearrangement reaction of methyl-p- dimethylaminobenzene sulfonate (MSE) in pure crystal to form the product p- trimethylammonium benzene sulfonate Zwitterion (ZWT) was investigated during this period.
		Detailed studies of the phonon spectra as well as the internal vibration spectra were made as a function of the percentage rearrangement using polycrystalline samples as well as single crystals in different orientations.
		An important aspect of a dynamical model is to determine specificity in phonon induction of solid state reactions.
	www.stormingmedia.us /04/0417/A041702.html (289 words)

	JCE 1999 (76) 1717 [Dec] The Hofmann Rearrangement Using Household Bleach: Synthesis of 3-Nitroaniline (Site not responding. Last check: 2007-10-17)
		The Hofmann rearrangement is an important example of a rearrangement reaction that is discussed in most sophomore organic chemistry texts.
		We have developed a simple experiment that involves the Hofmann rearrangement of 3-nitrobenzamide to give 3-nitroaniline using household bleach.
		The synthesis of 3-nitrobenzamide by nitration of benzamide and the subsequent Hofmann rearrangement can be carried out in two-and-a-half hours, making this a new and simple two-step reaction sequence for the organic laboratory.
	www.jce.divched.org /Journal/Issues/1999/Dec/abs1717.html (155 words)

	TPR-MET Oncogenic Rearrangement: Detection by Polymerase Chain Reaction Amplification of the Transcript and Expression ...
		Activation of the MET protooncogene by a rearrangement involving the fusion of TPR and MET specific gene sequences has been observed in a human osteosarcoma cell line (HOS) treated in vitro with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG).
		The rearrangement was also detected at very low levels in the parental (nontransformed) cell line, HOS TE-85.
		A preliminary survey of cell lines derived from a variety of human tumors indicates that TPR-MET rearrangement occurred and was expressed at very low frequencies by cells from 7 of 14 tumors of nonhematopoietic origin.
	www.pnas.org /cgi/content/abstract/87/2/738 (452 words)

	Organic reaction - Art History Online Reference and Guide
		Each reaction has a stepwise mechanism that says how it happens, although this detailed description of steps is not always clear from a list of reactants alone.
		Here are some common reactions that you may run into in a college organic chemistry course: addition of HX to an alkene, halogen addition reaction, halohydrin formation reaction, oxymercuration reaction, hydroboration-oxidation reaction, hydrooxylation reaction, ozonolysis reaction, nucleophilic substitution, halogenation of an alkyl, hydration and dehydration.
		Here is a series of reactions that a chemist can perform to change molecules in a defined way: Beckmann rearrangement, Friedel-Crafts alkylation and acylation, Gilman reagent, Grignard reagent, Diels-Alder reaction, Pinner reaction, Sharpless epoxidation, Sharpless bishydroxylation, Swern oxidation
	www.arthistoryclub.com /art_history/Organic_reaction (521 words)

	organic reactions
		All of the Classic Organic Reactions images were created with ChemPen software.
		After you have enjoyed viewing the reactions, please do visit the links below and learn about the software used to illustrate these pages.
		von Braun Degradations; von Braun Cyanogen Bromide Reaction
	www.chempensoftware.com /organicreactions.htm (97 words)

	The Acid-Catalyzed Pinacol Rearrangement of 2,3-Dimethyl-2,3-butanediol. (Site not responding. Last check: 2007-10-17)
		In the present experiment, you will carry out a slightly different rearrangement driven by the formation of a resonance-stabilized carbocation; subsequent loss of a proton (essentially an E1 elimination) produces a carbon-oxygen double bond.
		The particular variation is known as the "pinacol rearrangement" after the substrate 2,3-dimethyl-2,3-butanediol (also known as pinacol).
		In addition to carrying out the rearrangement reaction, you gain your first experience with spectroscopy; specifically, infrared or IR spectroscopy.
	www-class.unl.edu /chem253a/Lab12/Index.htm (1105 words)

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