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Topic: Organometallic compound

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	Organometallic Thermochemistry Database
		For many organic compounds this technique affords very accurate data, not only because their reaction with oxygen is well characterized and occurs with nearly 100% yield, but also because the standard enthalpies of formation of the products (e.g.
		Unfortunately, there are too few cases where the thermochemistry of the same organometallic compound or of the same reaction have been probed by at least two groups or by at least two different experimental techniques.
		Thermochemical data evaluation for organometallic compounds is still incipient [1, 2, 3, 4, 5] and it may well be possible that different selections will be made in future updates of the Database.
	webbook.nist.gov /chemistry/om (1906 words)

	Organometallic compound - Wikipedia, the free encyclopedia
		An organometallic compound is partially characterized by the presence of one or more metal-carbon bonds, in which the carbon involved would, apart from the metal-carbon bond, be otherwise considered a part of an organic compound.
		Some organometallic compounds derived from electropositive elements, such as Grignard reagents and organolithiums, have a high electron density on the carbon.
		In certain organometallic compounds such as ferrocene or dibenzenechromium, the pi-orbitals of the organic moiety ligate the metal.
	en.wikipedia.org /wiki/Organometallic_compound (144 words)

	Inorganic chemistry
		This includes all chemical compounds except the many which are based uponchains or rings of carbon atoms, which are termed organic compounds and are studiedunder the separate heading of organic chemistry.
		Itoften overlaps with geochemistry, analytical chemistry, environmental chemistry and organometallic chemistry.
		Organometallic chemistry combines aspects of organic chemistry with those of inorganic chemistry, and isformally defined as the study of compounds containing metal-carbon bonds, although many " organometallic compounds " contain no such bonds.
	www.therfcc.org /inorganic-chemistry-50.html (263 words)

	Encyclopedia :: encyclopedia : Chemical compound (Site not responding. Last check: 2007-10-31)
		A chemical compound is a chemical substance formed from two or more elements, with a fixed ratio determining the composition.
		A defining characteristic of a compound is that it has a chemical formula.
		The formula does not indicate that a compound is composed of molecules; for example, sodium chloride (table salt, NaCl) is an ionic compound.
	www.hallencyclopedia.com /Chemical_compound (227 words)

	Organolithium reagent - Wikipedia, the free encyclopedia
		An organolithium reagent is an organometallic compound with a direct bond between a carbon and a lithium atom.
		As this is an equilibrium reaction, the equilibrium lies towards the most electronegative organometallic compound, which stabilizes the carbanion the best.
		Organolithium compounds are also commonly used for nucleophilic addition reactions to carbonyl compounds and other electrophiles, although deprotonation can be a side reaction, especially with hindered organolithium reagents such as t-butyllithium.
	en.wikipedia.org /wiki/Organolithium_reagent (728 words)

	U.S. Patent: 5665271 - Silacyclohexane compounds, preparation thereof, liquid crystal compositions comprising the same, ...
		The silacyclohexane compounds of the general formulas (I) and (II) are prepared through carbon--carbon bonding or carbon--silicon bonding reaction between organometallic compounds or reagents and compounds having an eliminable group such as a halogen atom, a lower alkoxy group, a methanesulfonyloxy group, a benzenesulfonyloxy group, a p-toluenesulfonyloxy group or a trifluoromethanesulfonyloxy group.
		If the compound (ii) is further reacted with an organometallic compound such as CH.sub.3 M or R-M wherein R is as defined hereinbefore and M is Li, a magnesium halide or a zinc halide, thereby obtaining the compound (iii) or (iv).
		The compound (ix) may be obtained from the compound (iii) in the same manner as in the conversion of the compound (i) to the compound (ii).
	www.everypatent.com /comp/pat5665271.html (12309 words)

	Press Release: The 1973 Nobel Prize in Chemistry
		Organometallic compounds of this type have since been prepared and studied in considerable detail.
		The basic concept of organometallic chemistry was from 1949 and onwards widened through important contributions by the two British chemists Dewar and Chatt and a number of other scientists who investigated compounds where a metal atom was bonded to a bond between two carbon atoms rather than to the individual carbon atoms.
		The successful preparations of the methyl and hydrogen compounds led to penetrating international discussions of the reasons for the unexpected stability of these compounds and this discussion has strongly influenced the current ideas of how many organometallic compounds function used as catalysts mainly in reactions involving hydrogen.
	nobelprize.org /chemistry/laureates/1973/press.html (719 words)

	Organometallic Compound - Search Results - MSN Encarta (Site not responding. Last check: 2007-10-31)
		Organometallic Compound, compounds in which carbon atoms form covalent (“electron-sharing”) bonds with a metal atom.
		In metallic chemistry, the synthesis of organometallic and coordination compounds and the study of their chemical and physical properties have...
		The transition elements exhibit multiple valences, or oxidation states, typically ranging from 0 to +8 in compounds.
	uk.encarta.msn.com /Organometallic_Compound.html (101 words)

	Anionic polymerization process (Site not responding. Last check: 2007-10-31)
		Suitable organometallic compounds include organoalkali metal compounds such as ethyllithium, propyllithium, butyllithium, phenyllithium, phenylisopropylpotassium, carbazylpotassium, potassium.alpha.-methylstyrene tetramer and sodium.alpha.-methylstyrene tetramer; polynuclear metal complexes of an alkali metal with a polynuclear aromatic compound of naphthalene, anthracene and biphenyl; and organoalkaline earth metal compounds such as diethylberylium and dibutylmagnesium.
		The organometallic compounds as the purifying agent added to the solvent or the combination of the solvent and the inert gas atmosphere in the operation (1) are preferably compounds which are colored in the absence of a polymerization inhibitor and are discolored by reacting with the deactivating agent in the operation (II).
		Suitable organometallic compounds include sodium.alpha.-methylstyrene tetramer, potassium.alpha.-methylstyrene tetramer, 1,1-diphenylhexyllithium, phenylisopropylpotassium, triphenylmethyl sodium; colored oligomer anions having a polymerization degree of 20 or less preferably 10 or less; and polynuclear metal complexes of an alkali metal with a polynuclear aromatic compound such as biphenyl, benzophenone, fluorene, naphthalene and anthracene.
	www.patentdigi.com /electrical_insulation_metallic_conductors/anionic_polymerization_process.html (2763 words)

	Instructions to Authors
		For the purposes of this journal, an "organometallic" compound will be defined as one in which there is a bonding interaction (ionic or covalent, localized or delocalized) between one or more carbon atoms of an organic group or molecule and a main group, transition, lanthanide, or actinide metal atom (or atoms).
		In notes submitted to Organometallics, as with articles and communications, the title should be followed by the names of the authors and their affiliations and addresses and then by a brief (1-2 sentences) abstract.
		Organometallics will publish in the correspondence section notices concerning newly encountered, unexpected examples of the pyrophoric, explosive, or toxic nature of organometallic compounds or of special hazards encountered in organometallic reactions that the editors feel should be called to the attention of the organometallic community.
	www.cryst.chem.uu.nl /om.html (6132 words)

	Organometallic Molybdenum Chemistry
		We report the first case of an organometallic complex that effectively hydrolyzes the organophosphate pesticides parathion and paraoxon.
		These are the first known cases where an organometallic compound has been used to hydrolyze an organophosphate triester or pesticide in aqueous solution.
		The results herein represent one of the few cases of this type of unusual hydrolytic chemistry, and the first case of an organometallic complex that accelerates organophosphate pesticide hydrolysis.
	www.lclark.edu /dept/biochem/molybdenum.html (240 words)

	Highbeam Encyclopedia - Search Results for organometallic chemistry (Site not responding. Last check: 2007-10-31)
		organometallic chemistry ORGANOMETALLIC CHEMISTRY [organometallic chemistry] the reactions and use of a class of compounds (R-M) that contain a covalent bond between carbon and metal.
		He shared the 1973 Nobel Prize in Chemistry with Ernst Otto Fischer for their independent research on the organometallic compounds of the transitions metals.
		Aspects of the organometallic nitrosyl chemistry of the group 6 elements.
	www.encyclopedia.com /articles/09639.html (302 words)

	Method of producing acicular metal crystal - United States Patent 4,170,602
		That invention teaches nothing about the utility of similar compounds in the formation of an organometallic salt which is to be collected as a solid and only later is used as a precursor to metal formed by a high-temperature reduction process; i.e.
		Indeed, when used to produce acicular organometallic salts such as oxalates comprising a major portion of cobalt in the metal portion thereof, it has been found that the crystalline arrangement of the salt provides, upon suitable reduction to the metal, very substantial improvements in the magnetic properties of the metal.
		A thin slurry of the organometallic salts in the resulting liquid is formed and the isopropanol is evaporated as the slurry is stirred.
	xrint.com /patents/us/4170602 (12751 words)

	Zinc Alkyls, Edward Frankland, and the Beginnings of Main-Group Organometallic Chemistry
		A "radical" in 1848 was the name for a component group of a compound: i.e., a stable group of atoms that retains its integrity in its reactions and in its formation of compounds with other atoms or groups of atoms (generally electronegative).
		The development of main-group organometallic chemistry, with the discovery of the peralkyl derivatives of many of the main-group metals, had a crucially important consequence for the development of chemistry as a whole: it led Frankland to the concept of valency.
		This compound was discovered during his attempts to prepare ethylsodium by the reaction of ethyl iodide with sodium in diethyl ether.
	pubs.acs.org /cgi-bin/jtextd?orgnd7/20/14/html/om010439f.html (11244 words)

	Expert: Synthetic Organometallic Chemistry Expert
		He has conducted research projects involving the chemistry of over half of the transition metals, and is very familiar with the chemistry of the common reagents, as well as the less common intermediates.
		Expert's primary area of research is organometallic chemistry, with a strong emphasis in cyclopentadienyl metal chemistry.
		Expert has recently undertaken projects in the synthesis of chiral organometallic compounds, and has pioneered the use of chiral HPLC to resolve mixtures of these compounds.
	www.intota.com /viewbio.asp?bioID=614376&perID=711885 (644 words)

	Process for imaging of photoresist including treatment of the photoresist with an organometallic compound - Patent ...
		In the fourth step of the process of the present invention, the film is contacted with an organometallic compound disposed in the gas phase or in solution.
		Preferred organometallic compounds are organosilicon and organostannyl compounds including, for example, dimethylaminotrimethylsilane, hexamethyldisilazane, trimethylsilyl chloride, trimethyl stannyl chloride, dimethyl stannyl chloride, and 1,1,3,3,5,5 hexamethylcyclotrisilazane.
		The unmasked reactive functionalities in the exposed portion of the film will react with the organometallic compound to form a material which is resistant to reactive ion etching.
	www.freepatentsonline.com /5250395.html (3445 words)

	Organometallic compound - Information from Reference.com
		catalyst is a titanium-based organometallic compound used in the...
		Organometallic compounds provide a source of nucleophilic carbon atoms which can
		organometallic compound: any of a class of substances in which the molecules
	www.reference.com /search?q=Organometallic%20compound&db=web (142 words)

	What is the definition of an organometallic (Site not responding. Last check: 2007-10-31)
		Due to the vastness of organometallics it is considered both an old and new branch of chemistry.
		Organophosphorous compounds are so numerous that they are not included in organometallic chemistry.
		Organometallic chemistry embraces the organic derivatives of all of the alkali metals, non transition metals, transition metals(including the lanthanides the actenides) and of course the metalloids.
	easyweb.easynet.co.uk /~miky/projtpag/intwhat.htm (191 words)

	Technology offers from Japan- Chemistry & Chemical Engineering
		By making the butatriene react with low valence zirconium, a transition metal complex, they extracted a new type of organometallic compound, a five-member cyclic compound with a triple bond structure; its stable extraction had never been reported.
		The new compound was very stable and was found to be a pentagonal molecule of a fan-like shape through X-ray crystal structure analysis.
		It is expected that creation of new molecular compounds and development of new materials are possible using this new compound.
	www.tifac.org.in /offer/tsw/japchem.htm (1416 words)

	Expert: Metallocenes, Catalysis Expert
		Expert has expertise in inorganic, coordination, and organometallic chemistry as well as in the application of inorganic, coordination, and organometallic compounds in organic synthesis and catalysis.
		Having expertise in transition element chemistry, Expert has worked with the synthesis, structures, bonding, and chemical reactivity of transition metal compounds, including metal salts, coordination complexes, and organometallic compounds.
		Expert has developed novel cationic aluminum alkyl compounds and is studying their application in olefin polymerization and other catalytic processes.
	www.intota.com /viewbio.asp?bioID=604233&perID=715656 (435 words)

	Uranocene. The First Member of a New Class of Organometallic Derivatives of the f Elements
		However, this compound had not been prepared by Hallwachs and Schafarik-they merely suggested it as a possible organometallic compound that might be accessible by the reaction of Frankland's newly discovered diethylzinc with UO Cl
		In view of this, Gilman and his students in their World War II program focused their efforts on the preparation of uranium compounds in which the organic groups were linked to uranium through oxygen, nitrogen, or sulfur.
		The first organoactinide compounds were prepared 105 years after Frankland's discovery of dimethylzinc, the first organometallic compound to be reported in the literature.
	pubs.acs.org /cgi-bin/sample.cgi/orgnd7/2004/23/i15/html/om0400705.html (8612 words)

	Hot Gravity Filtration
		reaction, small pieces of magnesium will actually react with alkyl and aryl halides to produce an organometallic compound.
		In the case of Mg, the organometallic compound is normally written with covalent bonds.
		Anions that are strong nucleophiles react with carbonyl compounds in the following manner known as Nucleophilic Addition.
	www.ipfw.edu /chem/266/266spring03/266n0305.htm (288 words)

	cyclopentadienyl complexes (Site not responding. Last check: 2007-10-31)
		This compound was to be named ferrocene due to its aromatic behaviour and has become one of the most studied organometallic compound.
		The discovery of ferrocene was in effect the discovery of sandwich compounds which has now formed the conerstone of organometallic chemistry.
		The ligands in sanwich compounds do not nescesarily have to be equal and often we get a variety of different types.
	easyweb.easynet.co.uk /~miky/projtpag/intpent.htm (290 words)

	topicstbl.html
		Synthesis of hexanuclear transition metal cluster compounds W
		General concepts of compound and material purification and characterization; X-ray diffractometry
		Transition metal organometallic chemistry: metal alkylidenes; catalysis; alkene polymerization
	www.uiowa.edu /~c004153/topics153tbl.html (221 words)

	Igitur-archive (Site not responding. Last check: 2007-10-31)
		A tetranuclear organometallic compound with bridging aryl groups between silver and lithium
		Molecular weight determinations, and }1{}3{C NMR and }1{H NMR spectra reveal that the compound exists (in benzene) as a tetranuclear mixed metal cluster containing aryl groups bridging the silver and lithium atoms.
		Silver-proton, silver-carbon and lithium-carbon couplings have been observed in the NMR spectra of this compound.
	igitur-archive.library.uu.nl /chem/2005-0622-174222/UUindex.html (67 words)

	Inorganic Chemistry [encyclopedia] (Site not responding. Last check: 2007-10-31)
		Organometallic chemistry combines of organic chemistry with inorganic chemistry, and is partially characterized by the study of metal-carbon bonds, in which the carbon, apart from the metal-carbon bond, would otherwise be considered a part of an organic compound.
		Vitamin B12, whose active site is similar to that of hemoglobin, is a naturally-occurring, metabolically-important organometallic compound containing a large organic components (corrin and protein), a metal (cobalt), a bond between the metal and the carbon of a methyl group.
		Adding to the confusion, the oxides of carbon, carbonate salts, and materials containing carbon like steel and diamond are usually considered inorganic, while the inorganic molecule nitric oxide is often studied for biochemical effects.
	www.kosmoi.com /Science/Chemistry/Inorganic (304 words)

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