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	Metathesis - Wikipedia, the free encyclopedia
		Metathesis is a sound change that alters the order of phonemes in a word.
		In Straits Saanich metathesis is used as a grammatical devise to indicate "actual" aspect.
		Metathesis is used in chemistry as a synonym for olefin metathesis.
	en.wikipedia.org /wiki/Metathesis (521 words)

	§ 131. metathesis. 7. Pronunciation Challenges. The American Heritage Book of English Usage. 1996 (Site not responding. Last check: 2007-10-20)
		Metathesis is a term used in linguistics to refer to the transposition of elements in a word or sentence.
		Two historical examples of metathesis are Modern English bird and horse from Old English brid and hros.
		Over time the metathesized pronunciations became standard, and the spellings were changed to conform to the new pronunciations.
	www.bartleby.com /64/C007/0131.html (174 words)

	Patent 4545941: Co-metathesis of triglycerides and ethylene
		Metathesis, also called disproportionation, is a catalytic reaction involving the random interchange of akylidene units among olefinic hydrocarbons via the formation and cleavage of carbon-carbon double bonds.
		The metathesis reaction is reversible and attains a thermodynamic equilibrium in which distribution of the alkylidene moieties is statistical except when steric or conjugation effects are pronounced.
		The metathesis reaction is generally catalyzed by a system containing both a transition and a non-transition metal component.
	www.freepatentsonline.com /4545941.html (4141 words)

	Metathesis
		Metathesis is the phenomenon whereby two sounds that appear in a particular order in one form of a word occur in the reverse order in a related form of the word.
		While metathesis is not as common as other processes affecting sounds in language, such as assimilation or deletion, it does, nonetheless, occur as a regular phonological process in synchronic systems in a wide range of languages.
		(Note that not all reported cases of metathesis are actual cases of metathesis, as noted in some of the language listings.) The second aim of this project is to come to a clearer understanding of the nature of metathesis and, with this knowledge, develop a constrained and predictive theory of metathesis.
	www.ling.ohio-state.edu /~ehume/metathesis (368 words)

	VIEW ROA 512
		Metathesis, or the transposition of whole segments either synchronically or from one historical language stage to another, has usually been regarded as one of the less common phonological processes, even to such an extent that researchers have asked the question whether it exists at all as a synchronic (morpho)phonological process (Hock 1991).
		At any rate, the formalization of metathesis has long been a problem for phonological theories: specific analyses have typically been subject to the criticism that while being descriptively adequate, they could not explain the process, let alone address the question of what types of metathesis are possible, and what types are not.
		In this paper we explore previous approaches to metathesis, as in SPE and autosegmental phonology, and argue that Optimality Theory is a better candidate to account for processes of this type, on the basis of a fully productive metathesis process found in Modern Georgian.
	roa.rutgers.edu /view.php3?id=643 (188 words)

	Water Purification with Chlorine Dioxide (Site not responding. Last check: 2007-10-20)
		Metathesis of Acidic By-Product of Chlorine Dioxide Generating Process Sodium sesquisulfate produced in crystalline form in a high acidity highly efficient chlorine dioxide generating process is converted by metathesis to crystalline anhydrous neutral sodium sulfate and the acid recovered as a result is recycled to the chlorine dioxide generating step.
		The metathesis is effected by contacting the crystalline sodium sesquisulfate with aqueous sodium chlorate solution, aqueous sodium chloride solution, aqueous methanol or water alone.
		The metathesis is effected in such manner as to minimize the additional evaporative load imposed on the chlorine dioxide generating process by the metathesis medium.
	www.clo2.com /reading/patents/pat.html (2055 words)

	Alkyne Metathesis in Synthesis: Syntheses of (+)-Ferrugine and Anatoxin-a
		Although much emphasis has been placed on the importance of alkene metathesis in organic synthesis, alkyne metathesis is also significant.
		Metathesis reactions of alkynes with alkenes and metathesis reactions of alkynes with alkynes have both been carried out efficiently.
		Metathesis was carried out on the eneyne 15, again using the second-generation Grubbs catalyst 13.
	www.organic-chemistry.org /Highlights/2004/25OctoberB.shtm (278 words)

	New Adventures in Metathesis (Site not responding. Last check: 2007-10-20)
		Metathesis has taken a semantical leap from pure "transposition" of phonemes to transposition of subject, object and catalyst.
		We should not mistake metathesis for Joyce's (and Woolf's and James') "stream of consciousness." Joyce's is an attempt at the language of thought.
		But metathesis is not necessarily the transposition of the reader into the mind of the subject.
	projectedletters.com /vault/4/metathesis (2847 words)

	Literal-Minded: Metathesis: Not the Same as a Meta-Thesis (Site not responding. Last check: 2007-10-20)
		The conventional wisdom on metathesis is that, unlike other sound changes that might affect a language's phonology over time, metathesis is a sporadic, irregular process.
		Hume also argues (with evidence to back it up) that the result of a metathesis operation will always be one that already exists in the language.
		Perhaps the metathesis in "Agpar" is encouraged by a perceived semantic connection to "par", which can mean a kind of score or rating.
	literalmind.blogspot.com /2004/09/metathesis-not-same-as-meta-thesis.html (1030 words)

	Ward, Donald William (2003-07-10) Stereoselective ruthenium-catalyzed olefin metathesis. ...
		Ward, Donald William (2003-07-10) Stereoselective ruthenium-catalyzed olefin metathesis.
		Chapter 4 relates efforts to develop a useful test for measuring the inherent stereoselectivity of a wide array of ruthenium-based olefin metathesis catalysts by converting them to relatively inactive Fischer-alkylidenes in a single-turnover reaction with dihydrofuran.
		A group of approximately twenty olefin metathesis catalysts is tested with this technique, and the resulting data are found to correlate well with the results of the ring-closing metathesis of macrocycles.
	resolver.caltech.edu /CaltechETD:etd-07152003-183214 (307 words)

	VIEW ROA 180
		Metathesis in the Austronesian language Leti, is not only regular and productive, but may be driven by purely phonological considerations.
		This paper examines two types of metathesis in Leti, the first being motivated by a requirement that all phrases end in a vowel, and the second, by syllable well-formedness conditions: syllables have onsets and tautosyllabic consonant clusters are avoided.
		Additional constraints are also motivated as a means of accounting for the observation that it is consistently the final vowel and consonant of a given morpheme that metathesize, even though metathesis involving other segments would result in equally well-formed Leti words.
	roa.rutgers.edu /view.php3?roa=180 (175 words)

	Patent 5198511: Polymerizable compositions containing olefin metathesis catalysts and cocatalysts, and methods of use ...
		Certain olefin metathesis polymerization cocatalysts which are not sensitive to air or water have been taught; however, they are used in combination with air or water sensitive transition metal compounds, so that the reaction mixture still must be scrubbed of, and protected from water or air or both.
		Oxidative cocatalysts of the present invention can provide advantages in terms of faster metathesis rates, reduced induction periods, better yields, and, in particular, better tolerance of organic functional groups which may be present as groups on the cyclic olefin monomer or as groups on other additives to the reaction mixture, such as solvents.
		Polymers formed via olefin metathesis polymerization of cyclic monomers are useful as molded articles, elastomers, dielectric supports, ionophoric or biologically active materials, composite materials, coated articles, and the like.
	www.freepatentsonline.com /5198511.html (8210 words)

	bibliography
		A rule-account of metathesis in Gascon, Linguistic Investigationes 11.
		Metathesis in Maltese: Implications for the Strong Morphemic Plane Hypothesis.
		Metathesis and the quest for definiteness in the Leti of Tutukey (East-Inonesia).
	www.ling.ohio-state.edu /~ehume/metathesis/bibliography.html (1345 words)

	Dr Susan Armstrong - Alkene Metathesis (Site not responding. Last check: 2007-10-20)
		The classic alkene metathesis reaction in synthesis is ring closing metathesis, illustrated below together with the accepted mechanism for the catalysed reaction.
		For small molecules, alkene-alkyne metathesis, crossed metathesis, and tandem processes such as ring opening followed by crossed metathesis, have found a variety of applications.
		We are working on two main areas: the development of new and improved catalysts; and novel applications of ring closing metathesis.
	www.chem.gla.ac.uk /~susana/metathesis.html (156 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Subject: sum : metathesis back posted query both linguist an-lang ( austronesian languages linguistics) asking references treatments metathesis using recent phonological theory.
		turns metathesis has play fairly important role recent discussions morphological phonological theory.
		stonham argues contrary difficulties encountered combinatorial morphology handling metathesis show theory is inadequate processes movement rules are needed : rather difficulties reflect fact metathesis does occur grammatical marker.
	squash.ils.unc.edu /~efrom/data/lingspam/lingspam.stopped/real/6-1017msg1.txt (569 words)

	FACULTY ::: Division of Chemistry and Chemical Engineering ::: CALTECH
		&#147;Metathesis of Electron Rich Olefins: Structure and Reactivity of Electron Rich Carbene Complexes.” J. Louie and R. Grubbs, Organometallics 2002, 21 (11), 2153-2164.
		“New Ruthenium-Based Olefin Metathesis Catalyst Coordinated with 1,3-Dimesityl-1,4,5,6-tetrahydropyrimidin-2-ylidene: Synthesis, X-Ray Structure and Reactivity.” J. Yun, E. Marinez, and R. Grubbs, Organometallics 2004, 23, 4172-4173.
		“A Ruthenium Olefin Metathesis Catalyst with a Four-Membered N-Heterocyclic Carbene Ligand.” E. Despagnet-Ayoub and R. Grubbs, Organometallics 2005, 24, 338-340.
	cce.caltech.edu /faculty/grubbs/pubs.html (1167 words)

	Metathesis (Site not responding. Last check: 2007-10-20)
		The process of metathesis has altered the shape of many familiar words in the English language.
		Axe for ask goes back to Old English days, when ascian and axian were both in use.
		Metathesis is used in chemistry as a synonym for double decomposition.
	www.sciencedaily.com /encyclopedia/metathesis (228 words)

	C&EN: COVER STORY - OLEFIN METATHESIS: THE EARLY DAYS
		Olefin metathesis was first observed in the 1950s by industrial chemists.
		In an attempt to explain olefin metathesis, Grubbs--who by then had moved to Michigan State University, East Lansing--proposed that the redistribution of groups around the double bonds was due to a rearranging metallacyclopentane intermediate [J. Am.
		This paper, everyone agrees, was the first to envision correctly a key role for metal carbenes in olefin metathesis and the events that lead to exchange of groups around carbon-carbon double bonds.
	pubs.acs.org /cen/coverstory/8051/8051olefin2.html (3589 words)

	CHM 1046 (Site not responding. Last check: 2007-10-20)
		Metathesis reactions that result in an insoluble precipitate are called precipitation reactions
		The solubility of NaCl is around 10 moles/L (it is highly soluble and won't drive a metathesis reaction).
		If a possible metathesis reaction involves the formation of a gas (and the gas is not particularly soluble in H
	wine1.sb.fsu.edu /chm1046/notes/AquaRxns/Metathes/Metathes.htm (717 words)

	Synthesis of Functionalized Olefins by Cross and Ring-Closing Metatheses (Site not responding. Last check: 2007-10-20)
		This lack of reactivity may result from the sequestering of the catalyst in a stabilized Fischer-type carbene complex, which either rapidly decomposes or fails to react further.
		To compare reactivities of intra- and intermolecular metathesis, RCM reactions of substrates bearing vinyl functional groups were performed, and the results are summarized in Table 3
		In conclusion, the cross-metathesis and ring-closing metathesis of a variety of electron-deficient olefins employing ruthenium alkylidene 3 has been described.
	pubs.acs.org /cgi-bin/jcen?jacsat/122/i15/html/ja9939744.html (1514 words)

	Conference Lectures
		Metathesis of olefins with zerovalent complexes of tungsten.
		The stereoselectivity on the olefin metathesis reaction: mechanistic and synthetic approach.
		Metathesis of acyclic and cyclic olefins with chloro-aryloxy-carbene complexes of tungsten.
	www.cpe.fr /lcomsnew/basset/publications/INVITEES.html (951 words)

	C&EN: COVER STORY - OLEFIN METATHESIS: BIG DEAL REACTION
		The power of olefin metathesis is that it transforms the carbon-carbon double bond, a functional group that is unreactive toward many reagents that react with many other functional groups.
		Schrock and Hoveyda began a collaboration to develop asymmetric catalysts for olefin metathesis in 1997 and within a year reported the first examples of efficient asymmetric olefin metathesis with a chiral catalyst, also based on molybdenum.
		The buzz of olefin metathesis is heard not only in research labs among chemists applying the reaction to complex syntheses.
	pubs.acs.org /cen/coverstory/8051/8051olefin.html (2419 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Noels, A. Demonceau In "Metathesis Polymerization of Olefins and Polymerization of Alkynes", Y.
		Noels, A. Demonceau In "Metathesis Polymerization of Olefins and Polymerization of Alkynes", Y. Imamoglu, Ed., Kluwer Academic Publishers, The Netherlands, 1998, 139-156.
		Messere, A. Noels, P. Dournel, J. Breulet In "Metathesis Polymerization of Olefins and Polymerization of Alkynes", Y. Imamoglu, Ed., Kluwer Academic Publishers, The Netherlands, 1998, 393-401.
	www.ulg.ac.be /cerm/cata_98.txt (306 words)

	COC Contents and Abstracts, Vol 4, No. 6 (Site not responding. Last check: 2007-10-20)
		This account is devoted to a discussion of synthetic applications of olefin metathesis in carbohydrate chemistry.
		Olefin metathesis has emerged as a highly promising and exciting area in the contemporary organic synthesis of carbon-carbon bonds.
		Compared with the ring-closing metathesis, this variation of the theme has, to date, received much less attention from the scientific community despite the fact that it has proved to be of tremendous synthetic value in the area of organometallic chemistry.
	www.bentham.org /coc/COC4-6.html (651 words)

	Alkylation of tris(pentafluorophenyl)boron with pentafluorophenyl lithium and metathesis with triphenylmethylchloride (Site not responding. Last check: 2007-10-20)
		Alkylation of tris(pentafluorophenyl)boron with pentafluorophenyl lithium and metathesis with triphenylmethylchloride
		Alkylation of tris(pentafluorophenyl)boron with pentafluorophenyl lithium and metathesis with triphenylmethylchloride; triphenylcarbenium tetrakis(pentafluorophenyl)borate
		The preparation of LiB(C6F5)4 should be carried out in light petroleum and subsequent metathesis with Ph3CCl in dichloromethane, in particular the salts should not be exposed at any stage to tetrahydrofuran, which leads to decomposition of the trityl salt.
	www.syntheticpages.org /pages/216 (826 words)

	Olefin Metathesis / Grubbs Reaction
		Olefin Metathesis allows the exchange of substituents between different olefins - a transalkylidenation.
		Synthetically useful, high-yield procedures for lab use include ring closure between terminal vinyl groups, cross metathesis - the intermolecular reaction of terminal vinyl groups - and ring opening of strained alkenes.
		Ring opening metathesis can employ an excess of a second alkene (for example ethene), but can also be conducted as a homo- or co-polymerization reaction.
	www.organic-chemistry.org /namedreactions/olefin-metathesis.shtm (235 words)

	Grubbs Catalysts and McMillan's OrganoCatalysts™ (Site not responding. Last check: 2007-10-20)
		Olefin metathesis is a synthetically powerful transformation in which a net exchange of olefin substituents occurs.
		A significant evolution in the development of olefin metathesis catalysts involves the use of ruthenium-based catalysts discovered in the laboratories of Professor Robert Grubbs at Caltech.
		The application of ruthenium-based olefin metathesis technology to the manufacture of pharmaceutical intermediates is boundless.
	www.sigmaaldrich.com /Area_of_Interest/Chemistry/ChemFiles/Vol_2_Supplement.html (679 words)

	Scherman, Oren Alexander (2004-02-19) Enhancing materials through controlled architectures with ring-opening metathesis ...
		The focus of the research presented in this thesis is the synthesis of functional polymers and construction of controlled molecular architectures through a polymerization process referred to as ring-opening metathesis polymerization (ROMP).
		A brief overview of polymer chemistry as well as ring-olefin metathesis polymerization is discussed in introductory Chapter 1.
		Chapters 2 and 3 discuss new synthetic routes to polyacetylene and polyacetylene block-copolymers from cyclooctatetraene and a new ruthenium olefin metathesis catalysts.
	etd.caltech.edu /etd/available/etd-02272004-034648 (444 words)

	[No title]
		It was, however, also found that oxygen overlayers on molybdenum affected the olefin metathesis rate where the rate of propylene metathesis increases with the addition of ~0.5 monolayer of oxygen and then decreases once again with the addition of further oxygen.
		One goal in this area has been to synthesize model olefin metathesis catalysts that mimic the activity of supported catalysts at high pressures to use as models for studying the chemistry on these surfaces with the aim of understanding the variation in catalytic activity for olefin metathesis as a function of sample oxidation state.
		This is because the rate both of benzene formation and of olefin metathesis are accelerated by the presence of hydrogen.
	surface.chem.uwm.edu /papers/paper1/cat.html (6782 words)

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