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21 results on '"Chudakova, Valentina A."'

1. Ligand “Brackets” for Ga–Ga Bond

Author

Fedushkin, Igor L., primary, Skatova, Alexandra A., additional, Dodonov, Vladimir A., additional, Yang, Xiao-Juan, additional, Chudakova, Valentina A., additional, Piskunov, Alexander V., additional, Demeshko, Serhiy, additional, and Baranov, Evgeny V., additional

Published
2016
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2. Electron Release and Proton Acceptance Reactions of (dpp-BIAN)Mg(THF)3

Author

Fedushkin, Igor L., Chudakova, Valentina A., Hummert, Markus, and Schumann, Herbert

Subjects
ddc:540
Abstract

(dpp-BIAN)Mg(THF)3 (1) (dpp-BIAN = 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene) and (PhCOO)2 react with splitting of the peroxide bridge and formation of the dimeric magnesium benzoate [(dpp-BIAN)MgOCOPh(THF)]2 (2). The reaction of 1 with PhCOOH yields the dimeric magnesium benzoate [(dpp-BIAN)(H)MgOCOPh(THF)]2 (3), whereas 1 and furanyl-2-carboxylic acid react with liberation of hydrogen and formation of (dpp-BIAN)Mg[OCO(2-C4H3O)]2 Mg(dpp-BIAN)(THF) (4). Compounds 2, 3, and 4 have been characterized by elemental analysis, IR spectroscopy, and X-ray structure analysis, compound 3 also by 1H NMR spectroscopy. The eightmembered metallacycles of the centrosymmetric dimers 2 and 3 are almost completely planar. The two magnesium atoms in 4 show different coordination spheres; one is surrounded by its ligands in a trigonal bipyramidal manner, the other one in a tetrahedral fashion. The Mg···Mg separations in 2, 3 and 4 are 4.236, 4.296, and 4.030 Å, respectively.

Published
2008

3. Organometallic Compounds of the Lanthanides 182 [1]. Calcium and Neodymium Complexes Containing the dpp-BIAN Ligand System: Synthesis and Molecular Structure of [(dpp-BIAN)CaI(THF)2]2 and [(dpp-BIAN)NdCl(THF)2]2

Author

Schumann, Herbert, Hummert, Markus, Lukoyanov, Anton N., Chudakova, Valentina A., and Fedushkin, Igor L.

Subjects
ddc:540
Abstract

Oxydation of (dpp-BIAN)Ca(THF)4 with 0.5 equiv. of I2 in THF yields [(dpp-BIAN)CaI(THF)2]2 (1). A corresponding neodymium compound [(dpp-BIAN)NdCl(THF)2]2 (2) has been obtained by reaction of (dpp-BIAN)Na2 with NdCl3 in THF. The X-ray single crystal structure analyses show 1 and 2 to be isostructural dimers containing octahedrally coordinated metal atoms bridged by the respective halides. The chelating dpp-BIAN ligand acts as a radical anion in the Ca2+ complex 1 and as a dianion in the Nd3+ complex 2, respectively.

Published
2007

12. Monomeric Magnesium and Calcium Complexes containing the Rigid, Dianionic 1, 2-Bis[(2, 5-di-tert-butylphenyl)imino]acenaphthene (dtb-BIAN) and 1, 2-Bis[(2-biphenyl)imino]acenaphthene (bph-BIAN) Ligands

Author

Fedushkin, Igor L., primary, Chudakova, Valentina A., additional, Skatova, Alexandra A., additional, Khvoinova, Natalie M., additional, Kurskii, Yuri A., additional, Glukhova, Tatyana A., additional, Fukin, Georgy K., additional, Dechert, Sebastian, additional, Hummert, Markus, additional, and Schumann, Herbert, additional

Published
2004
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17. MagnesiumII Complexes of the dppBIAN RadicalAnion: Synthesis, Molecular Structure, and Catalytic Activity in Lactide Polymerization

Author

Fedushkin, Igor L., Morozov, Alexander G., Chudakova, Valentina A., Fukin, Georgy K., and Cherkasov, Vladimir K.

Abstract

Reaction of dppBIANMgTHF31 {dppBIAN = 1,2bis[2,6diisopropylphenylimino]acenaphthene} with one molar equivalent of 2,2,6,6tetramethylpiperidine1oxyl TEMPO proceeds with oxidation of the dppBIAN dianion in 1to the radicalanion and affords the dppBIANMgTEMPOthf 2 complex. The reaction of dppBIAN with an excess amount of magnesium and 0.5 molar equivalents of I2in Et2O gives dppBIANMgIEt2On, which then reacts in situ with Me3Si2NK to produce dppBIANMg[NSiMe32]Et2O 3. Solventfree magnesium amide dppBIANMg[NSiMe32] 4 was synthesized by treating equimolar amounts of MgI2, dppBIAN, and sodium in toluene at reflux followed by treatment with Me3Si2NK. Deprotonation of diphenylacetonitrile with [dppBIANMgμMe]25 produces keteniminate complex dppBIANMgN=C=CPh2Et2O 6. Complexes 2–4and 6were characterized by ESR and IR spectroscopy; their molecular structures were determined by singlecrystal Xray analysis. Compounds 1–3catalyze the ringopening polymerization of L and raclactides to give high molecular weight isotactic and stereoblock polylactides correspondingly.© WileyVCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009

Published
2009
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18. Organometallic Compounds of the Lanthanides 182 [1]. Calcium and Neodymium Complexes Containing the dpp-BIAN Ligand System: Synthesis and Molecular Structure of [(dpp-BIAN)CaI(THF)2]2and [(dpp-BIAN)NdCl(THF)2]2

Author

Schumann, Herbert, Hummert, Markus, Lukoyanov, Anton N., Chudakova, Valentina A., and Fedushkin, Igor L.

Abstract

Oxydation of (dpp-BIAN)Ca(THF)4with 0.5 equiv. of I2in THF yields [(dpp-BIAN)CaI(THF)2]2(1). A corresponding neodymium compound [(dpp-BIAN)NdCl(THF)2]2(2) has been obtained by reaction of (dpp-BIAN)Na2with NdCl3in THF. The X-ray single crystal structure analyses show 1 and 2 to be isostructural dimers containing octahedrally coordinated metal atoms bridged by the respective halides. The chelating dpp-BIAN ligand acts as a radical anion in the Ca2+complex 1 and as a dianion in the Nd3+complex 2, respectively.

Published
2007
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19. Reduction of Benzophenone and 9(10H)-Anthracenone with the Magnesium Complex [(2,6-iPr<INF>2</INF>C<INF>6</INF>H<INF>3</INF>-bian)Mg(thf)<INF>3</INF>]

Author

Fedushkin, Igor L., Skatova, Alexandra A., Cherkasov, Vladimir K., Chudakova, Valentina A., Dechert, Sebastian, Hummert, Markus, and Schumann, Herbert

Abstract

The reduction of benzophenone with the magnesium complex [(2,6-iPr2C6H3-bian)Mg(thf)3] (1), containing the 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene dianion, affords the pinacolato complex [(2,6-iPr2C6H3-bian)Mg(thf)]2[μ-O2C2Ph4]·(C6H6)4 (2). The reaction of 1 with 9(10H)-anthracenone yields the 9-anthracenolato complex [(2,6-iPr2C6H3-bian)Mg(OC14H9)(thf)2] (3). Complexes 2 and 3 were characterized by elemental analyses, UV/Vis, IR, and ESR spectroscopy, as well as by single crystal X-ray diffraction. Complex 2 dissociates in solution with splitting of the bridging pinacolato unit, forming the biradical diimino/ketyl complex [(2,6-iPr2C6H3-bian)Mg(thf)(OCPh2)].

Published
2003
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20. Reduction of benzophenone and 9(10H)-anthracenone with the magnesium complex [(2,6-iPr2C6H3-bian)Mg(thf)3].

Author

Fedushkin IL, Skatova AA, Cherkasov VK, Chudakova VA, Dechert S, Hummert M, and Schumann H

Abstract

The reduction of benzophenone with the magnesium complex [(2,6-iPr(2)C(6)H(3)-bian)Mg(thf)(3)] (1), containing the 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene dianion, affords the pinacolato complex [(2,6-iPr(2)C(6)H(3)-bian)Mg(thf)](2)[micro-O(2)C(2)Ph(4)].(C(6)H(6))(4) (2). The reaction of 1 with 9(10H)-anthracenone yields the 9-anthracenolato complex [(2,6-iPr(2)C(6)H(3)-bian)Mg(OC(14)H(9))(thf)(2)] (3). Complexes 2 and 3 were characterized by elemental analyses, UV/Vis, IR, and ESR spectroscopy, as well as by single crystal X-ray diffraction. Complex 2 dissociates in solution with splitting of the bridging pinacolato unit, forming the biradical diimino/ketyl complex [(2,6-iPr(2)C(6)H(3)-bian)Mg(thf)(OCPh(2))].

Published
2003
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