Výsledky vyhledávání - "John N, Gitua"

Versatile Zirconium Reductants and Carbon-Carbon Coupling Agents Selectively Accessible from the 2:1 Molar Aggregate of n-Butyllithium and Zirconium(IV) Salts

Autor: John J. Eisch, John N. Gitua, Kun Yu

Publikováno v: European Journal of Organic Chemistry. 2011:3523-3530

In previous studies of transition metal alkyls the 2:1 molar aggregate of n-butyllithium and zirconium(IV) salts has been found to react both with benzylic hydrocarbons and aromatic carbonyl derivatives in diverse and useful ways. In the present stud

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b694fe9595a00bd4df1fb8d054fdc503
https://doi.org/10.1002/ejoc.201100307

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The epimetallation and carbonation of carbonyl and imino derivatives: Epivanadation route to 2-amino and 2-hydroxy acids

Autor: John J. Eisch, Paul O. Fregene, John N. Gitua

Publikováno v: Journal of Organometallic Chemistry. 692:4647-4653

The feasibility of hydrocarboxylating carbonyl and imino derivatives by the two-step process of epimetallation and carbonation has been demonstrated with the model substrates of 9-fluorenone and 9-fluorenone anil. With lithium vanadium dihydride as t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7381034fce7aba80ae2afe1a8f8285c9
https://doi.org/10.1016/j.jorganchem.2007.06.045

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Direct Epimetallation of π‐Bonded Organic Substrates with Titanium( II ) Isopropoxide: Intermediacy of Biradical, Oligomeric Titanium( II ) Reagents

Autor: John N. Gitua, John J. Eisch, David C. Doetschman

Publikováno v: European Journal of Inorganic Chemistry. 2006:1968-1975

Extensive EPR experiments show that a titanium-containing molecular triplet state is formed in solution by the reaction of two equivalents of butyllithium with one equivalent of titanium(IV) isopropoxide. At higher concentrations this product, titani

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ebc4fae92c0c3a3da728266e470c348e
https://doi.org/10.1002/ejic.200501074

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Unexpected Benzylic Carbon−Carbon Bond Cleavage by Transfer Epizirconation: Indications of an SET Pathway and Implications for Alkane Metathesis1

Autor: John N. Gitua, Somnath Dutta, John J. Eisch

Publikováno v: Organometallics. 24:6291-6294

In addition to the zirconation of benzylic hydrocarbons, Ar−CH3, by di-n-butylzirconium diethoxide and the ensuing C−C bond formation from (Ar−CH2)2Zr(OEt)2 to yield Ar−CH2−CH(ZrH(OEt)2)−Ar, it has now been found that Bu2Zr(OEt)2 in ether

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b32815fdfc0f329ca1ce2e89ad650634
https://doi.org/10.1021/om050744r

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The Extraordinary Cocatalytic Action of Polymethylaluminoxane (MAO) in the Polymerization of Terminal Olefins by Metallocenes: Chemical Change in the Group 4 Metallocene Dimethyl Derivatives Induced by MAO

Autor: Adetenu A. Adeosun, Peter O. Otieno, John J. Eisch, John N. Gitua

Publikováno v: European Journal of Organic Chemistry. 2005:4364-4371

In the polymerization of olefins with Group 4 metallocene dichlorides or dimethyl derivatives as procatalysts the use of polymethylaluminoxane (MAO) as the cocatalyst, especially in extreme excess (10 2 -10 3 times the metallocene equivalent), has be

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::65c0ca4933d005489e035de49427781f
https://doi.org/10.1002/ejoc.200500371

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The Potential of Photochemical Transition Metal Reactions in Prebiotic Organic Synthesis. I. Observed Conversion of Methanol into Ethylene Glycol as Possible Prototype for Sugar Alcohol Formation

Autor: John J. Eisch, Peter R. Munson, John N. Gitua

Publikováno v: Origins of Life and Evolution of the Biosphere. 34:441-454

Photochemical processes involving redox reactions between metal ions and organic substrates possess the versatile potential for having harnessed solar energy for prebiotic organic synthesis. The present study in our Laboratory has shown that ultravio

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https://doi.org/10.1023/b:orig.0000043123.83845.13

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Highly active and stereoselective olefin polymerization catalysts generated by the transfer-epimetallation of olefins or acetylenes with dialkyltitanium(IV) complexes: three-membered metallocycles as active catalyst sites‡

Autor: Adetenu A. Adeosun, John N. Gitua, Peter O. Otieno, John J. Eisch

Publikováno v: Macromolecular Symposia. 213:187-198

Efficient transfer-epimetallations of simple olefins and acetylenes by R 2 TiL 2 reagents (R = Bu n , Bu 1 ; L = X) are readily achieved in THF at -78°C to generate titanacyclopropa(e)ne intermediates, readily capable of inserting various unsaturate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b6d5024c200f37852ea5b2785f6eee4b
https://doi.org/10.1002/masy.200450918

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Mechanism of the Kulinkovich Cyclopropanol Synthesis: Transfer-Epititanation of the Alkene in Generating the Key Titanacyclopropane Intermediate

Autor: Adetenu A. Adeosun, John N. Gitua, John J. Eisch

Publikováno v: European Journal of Organic Chemistry. 2003:4721-4727

An investigation of the Kulinkovich cyclopropanol synthesis, the interaction of esters with 2:1 or 3:1 mixtures of alkyl Grignard reagents and Ti(OiPr)4 at low temperatures, has been conducted, in order to ascertain which reactive intermediates are i

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https://doi.org/10.1002/ejoc.200300588

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