Libor Dostál

Publications (32)96.8 Total impact

• Article: Reactivity of C,N-chelated organoboron compounds with lithium anilides - formation of unexpected 1,2,3-trisubstituted 1H-2,1-benzazaboroles.

  Martin Hejda, Antonín Lyčka, Roman Jambor, Aleš Růžička, Libor Dostál
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  ABSTRACT: A set of C,N-intramolecularly coordinated boranes containing various C,N-chelating ligands L(1-3) (where L(1) = [o-(CH[double bond, length as m-dash]NtBu)C(6)H(4)], L(2) = [o-(CH[double bond, length as m-dash]N-2,6-iPr(2)C(6)H(3))C(6)H(4)], L(3) = [o-(CH(2)NMe(2))C(6)H(4)]); L(1-3)BCl(2) (for L = L(1), for L = L(2), for L = L(3)), L(1)BPhCl () and L(1)BCy(2) () (where Cy = cyclohexyl) were synthesized and fully characterized by multinuclear NMR spectroscopy and in cases of and by the single crystal X-ray diffraction analysis. The reaction of with the anilides ArNHLi (Ar = 2,6-Me(2)C(6)H(3) or 2,6-iPr(2)C(6)H(3)) proceeded via unexpected addition of anilide across the C[double bond, length as m-dash]N bond yielding 1,2,3-trisubstituted 1H-2,1-benzazaboroles , whose structures were unambiguously established by single crystal X-ray diffraction analysis (except for ) and multinuclear NMR spectroscopy. In contrast, compounds and were inert towards ArNHLi. The investigation dealing with the reaction mechanism between the parent boranes and ArNHLi revealed that amidolithiation of the C[double bond, length as m-dash]N double bond involved in the ligand backbones is the crucial step of the whole reaction. The C[double bond, length as m-dash]N double bond in is activated by its coordination to the ortho bonded Lewis acidic boron center, which was also proven by the fact that the non-substituted ligand L(1)H did not react with ArNHLi under the same reaction conditions in an analogous reaction.
  Dalton Transactions 01/2013; · 3.84 Impact Factor
• Article: Synthesis and Structural Characterization of Heteroboroxines with MB(2)O(3) Core (M = Sb, Bi, Sn).

  Barbora Mairychová, Tomáš Svoboda, Petr Stěpnička, Aleš Růžička, Remco W A Havenith, Mercedes Alonso, Frank De Proft, Roman Jambor, Libor Dostál
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  ABSTRACT: Reaction of organoantimony and organobismuth oxides (LSbO)(2) and (LBiO)(2) (where L is [2,6-bis(dimethylamino)methyl]phenyl) with four equivalents of the organoboronic acids gave new heteroboroxines LM[(OBR)(2)O] 1a-2c (for M = Sb: R = Ph (1a), 4-CF(3)C(6)H(4) (1b), ferrocenyl (1c); for M = Bi: R = Ph (2a), 4-CF(3)C(6)H(4) (2b), and ferrocenyl (2c)). Analogously, reaction between organotin carbonate L(Ph)Sn(CO(3)) and two equivalents of organoboronic acids yielded compounds L(Ph)Sn[(OBR)(2)O] (where R = Ph (3a), 4-CF(3)C(6)H(4) (3b), and ferrocenyl (3c)). All compounds were characterized by elemental analysis and NMR spectroscopy. Their structure was described both in solution (NMR studies) and in the solid state (X-ray diffraction analyses 1a, 1c, 2b, 3b, and 3c). All compounds contain a central MB(2)O(3) core (M = Sb, Bi, Sn), and the bonding situation within these rings and their potential aromaticity was investigated by the help of computational methods.
  Inorganic Chemistry 01/2013; · 4.60 Impact Factor
• Article: Mixed Organotin(IV) Chalcogenides: From Molecules to Sn-S-Se Semiconducting Thin Films Deposited by Spin-Coating.

  Marek Bouška, Lukáš Střižík, Libor Dostál, Aleš Růžička, Antonín Lyčka, Ludvík Beneš, Milan Vlček, Jan Přikryl, Petr Knotek, Tomáš Wágner, Roman Jambor
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  ABSTRACT: Put the right spin on it: Mixed monomeric organotin(IV) chalcogenides of the general formula L(2) Sn(2) EX(2) containing two terminal Sn-X (X=Se, Te) bonds were prepared and were tested as potential single-source precursors for the deposition of semiconducting thin films. Spin-coating deposition of [{2,6-(Me(2) NCH(2) )(2) C(6) H(3) }SnSe](2) (μ-S), as the useful single-source precursor, provided amorphous Sn-S-Se semiconducting thin films.
  Chemistry 01/2013; · 5.93 Impact Factor
• Article: Monomeric organoantimony(III) sulphide and selenide with terminal Sb-E bond (E = S, Se). Synthesis, structure and theoretical consideration.

  Petr Šimon, Roman Jambor, Aleš Růžička, Antonín Lyčka, Frank De Proft, Libor Dostál
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  ABSTRACT: NCN chelated monomeric chalcogenides, LSbE (E = S (1), Se (2), L = 2,6-bis[N-(2',6'-dimethylphenyl)ketimino]phenyl), were synthesized and characterized with the help of elemental analysis, NMR spectroscopy and single-crystal X-ray diffraction analyses. The terminal Sb-E (E = S, Se) bonds in 1 and 2 were subjected to theoretical investigation and the results are compared with the hypothetical molecules, PhSb=E (E = S, Se, Te), and earlier reported analogues.
  Dalton Transactions 03/2012; 41(17):5140-3. · 3.84 Impact Factor
• Article: Intramolecularly coordinated organotin tellurides: stable or unstable?

  Marek Bouška, Libor Dostál, Zdeňka Padělková, Antonín Lyčka, Sonja Herres-Pawlis, Klaus Jurkschat, Roman Jambor
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  ABSTRACT: The step-wise oxidation of an organotin(I) compound with elemental tellurium gave a variety of unprecedented organotin tellurides containing tin atoms in the oxidation states +II and +IV.
  Angewandte Chemie International Edition 02/2012; 51(14):3478-82. · 13.45 Impact Factor
• Article: Intramolecularly coordinated [{2,6-(Me2NCH2)2C6H3}Sn(II)]+: a strong σ donor for Pt(II).

  Jana Martincová, Libor Dostál, Sonja Herres-Pawlis, Aleš Růžička, Roman Jambor
  Chemistry 06/2011; 17(27):7423-7. · 5.93 Impact Factor
• Article: NCN-chelated organoantimony(III) and organobismuth(III) phosphates: synthesis and solid-state and solution structures.

  Tomáš Svoboda, Libor Dostál, Roman Jambor, Aleš Růžička, Robert Jirásko, Antonín Lyčka
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  ABSTRACT: .Organoantimony(III) and organobismuth(III) phosphates (LM)(3)(PO(4))(2) [M = Sb (3) and Bi (4)], containing the NCN-chelating ligand L [L = 2,6-(CH(2)NMe(2))(2)C(6)H(3)], were prepared by the simple treatment of parent oxides 1 and 2 with H(3)PO(4). Both compounds were characterized by elemental analysis, electrospray ionization mass spectrometry, and IR and NMR spectroscopy and in the case of 3 by X-ray diffraction techniques. Compound 3 has an interesting behavior in solution, i.e., the formation of two possible conformational isomers, which was studied by (1)H, (13)C, and (31)P NMR spectroscopy.
  Inorganic Chemistry 06/2011; 50(14):6411-3. · 4.60 Impact Factor
• Article: OCO and NCO chelated derivatives of heavier group 15 elements. Study on possibility of cyclization reaction via intramolecular ether bond cleavage.

  Libor Dostál, Roman Jambor, Aleš Růžička, Robert Jirásko, Jaroslav Holeček, Frank De Proft
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  ABSTRACT: A set of four pincer ligands, either the OCO type ligands L(1-3) [2,6-(ROCH(2))(2)C(6)H(3)](-), where R = Me (L(1)), mesityl (L(2)), t-Bu (L(3)) or novel NCO ligand [2-(Me(2)NCH(2))-6-(t-BuOCH(2))C(6)H(3)](-) was studied. The reaction of L(4)Li with PCl(3) resulted in isolation of [2-(OCH(2))-6-(Me(2)NCH(2))C(6)H(3)]PCl (1) as a result of intramolecular ether bond cleavage and elimination of t-BuCl. The conversion between the organolithium compounds L(1,2,4)Li and AsCl(3) led to the desired chlorides, i.e. (L(1))(2)AsCl (2), L(2)AsCl(2) (3), L(4)AsCl(2) (5), but an analogous reaction using the L(3)Li compound gave [2-(OCH(2))-6-(t-BuOCH(2))C(6)H(3)]AsCl (4) as a result of intramolecular cyclization. The organoantimony chloride L(3)SbCl(2) was shown to undergo very slow cyclization in CDCl(3) again via elimination of t-BuCl giving [2-(OCH(2))-6-(t-BuOCH(2))C(6)H(3)]SbCl (6) and it was demonstrated that this reaction may be accelerated by preparation of L(3)Sb(Cl)(OTf) (7) with more Lewis acidic central atom. On the contrary, both antimony derivatives of the NCO ligand L(4), not only the chloride L(4)SbCl(2) (8) but also the ionic pair containing highly Lewis acidic cation [L(4)SbCl](+)[CB(11)H(12)](-) (9), are stable without any indication for etheral bond cleavage. The situation is rather similar in the case of organobismuth derivatives of L(4), which allowed isolation of compounds L(4)BiCl(2) (10), L(4)Bi(Cl)(OTf) (11) and [L(4)BiCl](+)[CB(11)H(12)](-) (12). All studied compounds were characterized by the help of (1)H and (13)C NMR spectroscopy, ESI mass spectrometry, elemental analysis and (except 1) by single-crystal X-ray diffraction.
  Dalton Transactions 04/2011; 40(35):8922-34. · 3.84 Impact Factor
• Article: Oxidation of intramolecularly coordinated distannyne by S8: from tin(I) to tin(IV) polysulfide via tin(II) sulfide.

  Marek Bouška, Libor Dostál, Aleš Růžička, Ludvík Beneš, Roman Jambor
  Chemistry 01/2011; 17(2):450-4. · 5.93 Impact Factor
• Article: Intramolecularly coordinated tin(II) selenide and triseleneoxostannonic acid anhydride.

  Marek Bouška, Libor Dostál, Frank de Proft, Aleš Růžička, Antonín Lyčka, Roman Jambor
  Chemistry 01/2011; 17(2):455-9. · 5.93 Impact Factor
• Article: Intramolecularly Coordinated Stannanechalcogenones: X-ray Structure of [2,6-(Me2NCH2)2C6H3](Ph)Sn═Te

  Barbora Mairychová, Libor Dostál, Aleš Růžička, Michal Fulem, Květoslav Růžička, Antonín Lyčka, Roman Jambor
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  ABSTRACT: The treatment of an intramolecularly coordinated organotin(IV) dichloride, [2,6-(Me2NCH2)2C6H3](Ph)SnCl2 (1), with Li2E (E = S, Se, Te) afforded thermally stable dimeric diarylstannanethione [{2,6-(Me2NCH2)2C6H3}(Ph)Sn(?-S)]2 (2) and monomeric diarylstannaneselone and -tellurone [{2,6-(Me2NCH2)2C6H3}(Ph)Sn═E] (E = Se (3), Te (4)). Compounds 2?4 were characterized by means of elemental analyses and 1H, 13C, 77Se, 119Sn, and 125Te NMR spectroscopy. The molecular structures of 2 and 4 were determined by single-crystal X-ray diffraction analysis. Solution NMR studies revealed dependence of the structure of compounds 2 and 3 on the solvent (C6D6 or CDCl3). In addition, the synthesis of dimeric stannanetellurone [{2,6-(Me2NCH2)2C6H3}(Bu)Sn(?-Te)]2 (5) showed an influence of the organic group R (R = Bu or Ph) on the structure of diorganotin(IV) tellurides 4 and 5.
  Organometallics 01/2011; 30(21):5904-5910. · 3.96 Impact Factor
• Article: Palladium(II) complexes of Y,C,Y‐chelated phosphines: synthesis, structure, and catalytic activity in Suzuki–Miyaura reaction

  Tomáš Řezníček, Libor Dostál, Aleš Růžička, Jiří Kulhánek, Filip Bureš, Roman Jambor
  Applied Organometallic Chemistry 11/2010; 25(3):173 - 179. · 2.06 Impact Factor
• Article: NCN Chelated Organoantimony(III) and Organobismuth(III) Phosphinates and Phosphites: Synthesis, Structure and Reactivity

  Tomáš Svoboda, Roman Jambor, Aleš Růžička, Zdeňka Padělková, Milan Erben, Libor Dostál
  Berichte der deutschen chemischen Gesellschaft 10/2010; 2010(33):5222 - 5230. · 2.94 Impact Factor
• Article: Monomeric organoantimony(I) and organobismuth(I) compounds stabilized by an NCN chelating ligand: syntheses and structures.

  Petr Simon, Frank de Proft, Roman Jambor, Ales Růzicka, Libor Dostál
  Angewandte Chemie International Edition 07/2010; 49(32):5468-71. · 13.45 Impact Factor
• Article: NCN‐Chelated Organoantimony(III) and Organobismuth(III) Phosphonates: Syntheses and Structures

  Tomáš Svoboda, Roman Jambor, Aleš Růžička, Zdeňka Padělková, Milan Erben, Robert Jirásko, Libor Dostál
  Berichte der deutschen chemischen Gesellschaft 02/2010; 2010(11):1663 - 1669. · 2.94 Impact Factor
• Article: Nonconventional behavior of NCN-chelated organoantimony(III) sulfide and isolation of cyclic organoantimony(III) bis(pentasulfide).

  Libor Dostál, Roman Jambor, Ales Růzicka, Robert Jirásko, Václav Lochar, Ludvík Benes, Frank de Proft
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  ABSTRACT: Organoantimony(III) sulfide (1) containing the NCN chelating ligand L [L = 2,6-(CH(2)NMe(2))(2)C(6)H(3)] displays unusual dual behavior, being dimeric (LSbS)(2), with the central Sb(2)S(2) core, in the solid state but monomeric in solution. Sulfide 1 reacts with elemental S to give the unprecedented cyclic bis(pentasulfide) LSb(mu-S(5))(2)SbL (2) with the central 12-membered ring Sb(2)S(10).
  Inorganic Chemistry 11/2009; 48(22):10495-7. · 4.60 Impact Factor
• Article: Organotin(IV) Derivatives of Some O,C,O-Chelating Ligands. Part 2⊥

  Libor Dostál, Roman Jambor, Aleš Růžička, Ivana Císařová, Jaroslav Holeček, Monique Biesemans, Rudolph Willem, Frank De Proft, Paul Geerlings
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  ABSTRACT: A new O,C,O-chelating ligand [2,6-C6H3(CH2OEt)2]- and its organotin(IV) derivatives, LSnPh3, LSnPh2Cl, and LSnPhCl2 (4−6), were prepared and structurally characterized in solution as well as in the solid state by NMR and XRD techniques. The structure of these compounds was compared to those of analogous compounds containing ligands of the type [2,6-C6H3(CH2OR)2]-, where R = Me, i-Pr, and t-Bu, on the basis of various NMR spectral parameters, mainly on nJ(1H−119Sn) long-range couplings, solid-state structure determinations, and theoretical calculations at the B3LYP/LANL2DZ level. All of these methods showed that the structure is similar in all three phases (solid, solution, and in silico), but that it dramatically depends on the R substituent in the O,C,O-pincer ligand.
  11/2007;
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  Article: PalladiumII Complexes of the (N,C,N)SnCl Stannylene

  Jana Martincová, Libor Dostál, Aleš Růžička, Jan Taraba, Roman Jambor
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  ABSTRACT: The reactions of heteroleptic stannylene (N,C,N)SnCl (1), where N,C,N is an abbreviation for N,C,N-chelate 2,6-(Me2NCH2)2C6H3, with selected palladium complexes resulted in new SnII−PdII complexes in which 1 itself acts as a 2e-donor ligand, resulting in a Cl−PdII−SnII−Cl structural motif, instead of a PdII−SnII−Cl2, which would be expected in the case of insertion of 1 into a PdII−Cl bond.
  07/2007;
• Article: Dimeric Diorganotin Dications:  Structure and Catalytic Activity in Alcohol Acetylation

  Blanka Kašná, Libor Dostál, Ivana Císařová, Roman Jambor
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  ABSTRACT: We report the stabilization of the Sn2 diorganotin(IV) dication [Ph(L1)Sn(μ-OH)2Sn(L1)Ph]2+(1-CB11H12)-2 (2), where L1 is 1-{2,6-(MeOCH2)2C6H3}, which in contrast to the rare analogues prepared thus far does not contain a coordinated water molecule. Compound 2 exhibits high catalytic activity in the acetylation of alcohols.
  06/2007;
• Article: Aluminum(III) complexes containing O,O chelating ligand

  Libor Dostál, Roman Jambor, Ivana Císařová, Jan Merna, Jaroslav Holeček
  Applied Organometallic Chemistry 04/2007; 21(8):688 - 693. · 2.06 Impact Factor