Search Results - "Callens, Emmanuel"

Cationic Tungsten(VI) Penta-Methyl Complex: Synthesis, Characterization and its Application in Olefin Metathesis Reaction by Olivier-Bourbigou, H., Dey, Raju, Samantaray, Manoja K., Callens, Emmanuel, Hamieh, Ali, Emwas, Abdul-Hamid M., Abou-hamad, Edy, Kavitake, Santosh, Basset, Jean-Marie

“…Tungsten-hexa-methyl readily reacts with B(C6F5)3 in dichloromethane and generates the corresponding well-defined cationic tungsten-penta-methyl complex which…”
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First example of an Ugi type reaction on phenylsulfinimine-avermectin B1 derivatives by Callens, Emmanuel, Hüter, Ottmar, Lamy, Emmanuel, Lüthi, Patrick, Winkler, Tammo, Jung, Pierre M.J.

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WMe6 Tamed by Silica: Si–O–WMe5 as an Efficient, Well-Defined Species for Alkane Metathesis, Leading to the Observation of a Supported W–Methyl/Methylidyne Species by Samantaray, Manoja K, Callens, Emmanuel, Abou-Hamad, Edy, Rossini, Aaron J, Widdifield, Cory M, Dey, Raju, Emsley, Lyndon, Basset, Jean-Marie

“…The synthesis and full characterization of a well-defined silica-supported Si–O–W(Me)5 species is reported. Under an inert atmosphere, it is a stable material…”
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Nature and Structure of Aluminum Surface Sites Grafted on Silica from a Combination of High-Field Aluminum-27 Solid-State NMR Spectroscopy and First-Principles Calculations by Kerber, Rachel Nathaniel, Kermagoret, Anthony, Callens, Emmanuel, Florian, Pierre, Massiot, Dominique, Lesage, Anne, Copéret, Christophe, Delbecq, Françoise, Rozanska, Xavier, Sautet, Philippe

“…The determination of the nature and structure of surface sites after chemical modification of large surface area oxides such as silica is a key point for many…”
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Controlling the hydrogenolysis of silica-supported tungsten pentamethyl leads to a class of highly electron deficient partially alkylated metal hydrides by Maity, Niladri, Barman, Samir, Callens, Emmanuel, Samantaray, Manoja K, Abou-Hamad, Edy, Minenkov, Yury, D'Elia, Valerio, Hoffman, Adam S, Widdifield, Cory M, Cavallo, Luigi, Gates, Bruce C, Basset, Jean-Marie

“…The well-defined single-site silica-supported tungsten complex [([triple bond, length as m-dash]Si-O-)W(Me) ], , is an excellent precatalyst for alkane…”
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Cyclooctane Metathesis Catalyzed by Silica-Supported Tungsten Pentamethyl [(SiO)W(Me)5]: Distribution of Macrocyclic Alkanes by Riache, Nassima, Callens, Emmanuel, Samantaray, Manoja K., Kharbatia, Najeh M., Atiqullah, Muhammad, Basset, Jean-Marie

“…Metathesis of cyclic alkanes catalyzed by the new surface complex [(SiO)W(Me)5] affords a wide distribution of cyclic and macrocyclic alkanes. The major…”
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Synthesis of amides using the Ritter reaction with bismuth triflate catalysis by Callens, Emmanuel, Burton, Andrew J., Barrett, Anthony G.M.

“…N- tert-Alkyl and aryl amides were obtained by a Ritter reaction of various nitriles with tertiary alcohols in the presence of a catalytic amount of bismuth…”
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Unsaturated fatty acid esters metathesis catalyzed by silica supported WMe5 by Riache, Nassima, Callens, Emmanuel, Talbi, Karima, Basset, Jean-Marie

“…[Display omitted] •Metathesis of unsaturated fatty acid esters (FAEs) by W-based single catalytic system.•High selective olefin metathesis operating at high…”
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From single-site tantalum complexes to nanoparticles of TaxNy and TaOxNy supported on silica: elucidation of synthesis chemistry by dynamic nuclear polarization surface enhanced NMR spectroscopy and X-ray absorption spectroscopy by Mohandas, Janet C., Abou-Hamad, Edy, Callens, Emmanuel, Samantaray, Manoja K., Gajan, David, Gurinov, Andrei, Ma, Tao, Ould-Chikh, Samy, Hoffman, Adam S., Gates, Bruce C., Basset, Jean-Marie

“…Air-stable catalysts consisting of tantalum nitride nanoparticles represented as a mixture of TaxNy and TaOxNy with diameters in the range of 0.5 to 3 nm…”
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Fluxional Behavior of Molecular WMe 6 and of Silica Grafted WMe 6 by Credendino, Raffaele, Vignola, Emanuele, Poater, Albert, Callens, Emmanuel, Basset, Jean-Marie, Cavallo, Luigi

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[(SiO)TaVCl2Me2]: A Well-Defined Silica-Supported Tantalum(V) Surface Complex as Catalyst Precursor for the Selective Cocatalyst-Free Trimerization of Ethylene by Chen, Yin, Callens, Emmanuel, Abou-Hamad, Edy, Merle, Nicolas, White, Andrew J. P., Taoufik, Mostafa, Copéret, Christophe, Le Roux, Erwan, Basset, Jean-Marie

“…On the surface of it: In the absence of co‐catalyst, a well‐defined silica‐supported surface organometallic complex [(SiO)TaVCl2Me2] selectively catalyzes the…”
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Fluxional Behavior of Molecular WMe6 and of Silica Grafted WMe6 by Credendino, Raffaele, Vignola, Emanuele, Poater, Albert, Callens, Emmanuel, Basset, Jean-Marie, Cavallo, Luigi

“…Using DFT methods we describe the fluxional behavior of mono-, bi-, and tripodal W(CH3)6 species grafted on partially dehydroxylated silica. Our results show…”
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[(SiO)TaV(CH2)Cl2], the first tantalum methylidene species prepared and identified on the silica surface by Chen, Yin, Callens, Emmanuel, Abou-hamad, Edy, Basset, Jean-Marie

“…A novel surface tantalum methylidene [(SiO)TaV(CH2)Cl2] was obtained via thermal decomposition of the well-defined surface species [(SiO)TaVCl2Me2]. This first…”
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Bismuth-Catalyzed Benzylic Oxidations with tert-Butyl Hydroperoxide by Bonvin, Yannick, Callens, Emmanuel, Larrosa, Igor, Henderson, David A, Oldham, James, Burton, Andrew J, Barrett, Anthony G. M

“…Oxidation of alkyl and cycloalkyl arenes with tert-butyl hydroperoxide catalyzed by bismuth and picolinic acid in pyridine and acetic acid gave the…”
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From single-site tantalum complexes to nanoparticles of Ta x N y and TaO x N y supported on silica: elucidation of synthesis chemistry by dynamic nuclear polarization surface enhanced NMR spectroscopy and X-ray absorption spectroscopy by Mohandas, Janet C, Abou-Hamad, Edy, Callens, Emmanuel, Samantaray, Manoja K, Gajan, David, Gurinov, Andrei, Ma, Tao, Ould-Chikh, Samy, Hoffman, Adam S, Gates, Bruce C, Basset, Jean-Marie

“…Air-stable catalysts consisting of tantalum nitride nanoparticles represented as a mixture of Ta N and TaO N with diameters in the range of 0.5 to 3 nm…”
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From single-site tantalum complexes to nanoparticles of TaxNy and TaOxNy supported on silica: elucidation of synthesis chemistry by dynamic nuclear polarization surface enhanced NMR spectroscopy and X-ray absorption spectroscopyElectronic supplementary information (ESI) available: Complete experimental procedures, supporting characterization techniques, data and the details for the prepared compounds are provided. See DOI: 10.1039/c7sc01365e by Mohandas, Janet C, Abou-Hamad, Edy, Callens, Emmanuel, Samantaray, Manoja K, Gajan, David, Gurinov, Andrei, Ma, Tao, Ould-Chikh, Samy, Hoffman, Adam S, Gates, Bruce C, Basset, Jean-Marie

“…Air-stable catalysts consisting of tantalum nitride nanoparticles represented as a mixture of Ta x N y and TaO x N y with diameters in the range of 0.5 to 3 nm…”
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Corrigendum: Cyclooctane Metathesis Catalyzed by Silica-Supported Tungsten Pentamethyl [(SiO)W(Me)5]: Distribution of Macrocyclic Alkanes by Riache, Nassima, Callens, Emmanuel, Samantaray, Manoja K., Kharbatia, Najeh M., Atiqullah, Muhammad, Basset, Jean-Marie

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From single-site tantalum complexes to nanoparticles of Ta x N y and TaO x N y supported on silica: elucidation of synthesis chemistry by dynamic nuclear polarization surface enhanced NMR spectroscopy and X-ray absorption spectroscopy† †Electronic supplementary information (ESI) available: Complete experimental procedures, supporting characterization techniques, data and the details for the prepared compounds are provided. See DOI: 10.1039/c7sc01365e Click here for additional data file by Mohandas, Janet C., Abou-Hamad, Edy, Callens, Emmanuel, Samantaray, Manoja K., Gajan, David, Gurinov, Andrei, Ma, Tao, Ould-Chikh, Samy, Hoffman, Adam S., Gates, Bruce C., Basset, Jean-Marie

“…SOMC is exploited for synthesizing very fine nanoparticles of Ta x N y /TaO x N y on silica, elucidating the strategies with DNP SENS and EXAFS. Air-stable…”
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Understanding Tantalum-Catalyzed Ethylene Trimerization: When Things Go Wrong by Chen, Yin, Credendino, Raffaele, Callens, Emmanuel, Atiqullah, Muhammad, Al-Harthi, Mamdouh A, Cavallo, Luigi, Basset, Jean-Marie

“…Ethylene oligomerization to linear low-molecular-mass α-olefins is an open industrial challenge. Ta-based catalysts are promising systems, but the unclear…”
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Facile and Efficient Synthesis of the Surface Tantalum Hydride (≡SiO) 2 Ta III H and Tris-Siloxy Tantalum (≡SiO) 3 Ta III Starting from Novel Tantalum Surface Species (≡SiO)TaMe 4 and (≡SiO) 2 TaMe 3 by Chen, Yin, Ould-Chikh, Samy, Abou-Hamad, Edy, Callens, Emmanuel, Mohandas, Janet C., Khalid, Syed, Basset, Jean-Marie

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