Search Results - "Sitzmann, Helmut"

Tetra- and Pentaisopropylcyclopentadienyl Complexes of Group 15 Elements by Lauk, Sergej, Zimmer, Michael, Morgenstern, Bernd, Huch, Volker, Müller, Carsten, Sitzmann, Helmut, Schäfer, André

“…Pentaisopropylcyclopentadienyl dichloropnictogen complexes have been synthesized and studied in solution and in the solid state. The coordination mode of the…”
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Half-Sandwich Bis(tetramethylaluminate) Complexes of the Rare-Earth Metals: Synthesis, Structural Chemistry, and Performance in Isoprene Polymerization by Zimmermann, Melanie, Törnroos, Karl W., Sitzmann, Helmut, Anwander, Reiner

“…The protonolysis reaction of [Ln(AlMe4)3] with various substituted cyclopentadienyl derivatives HCpR gives access to a series of half‐sandwich complexes…”
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Exploration of iron ligand modes in dimeric iron (II) complexes by nuclear resonance scattering by Omlor, Andreas, Lauk, Sergej, Müller, Christina Sophia, Scherthan, Lena, Auerbach, Hendrik, Hochdörffer, Tim, Wolny, Juliusz A., Steinbrügge, Rene, Leupold, Olaf, Sergeev, Ilya, Wille, Hans Christian, Sitzmann, Helmut, Schünemann, Volker

“…The vibronic properties of two dimeric iron (II) high-spin complexes [ 5 CpFeX] 2 ( 5 Cp = Pentaisopropyl-cyclopentadienyl, X = OH-( 1 ), Br-( 2 )) have been…”
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Synthesis of chromium N-heterocyclic carbene complexes using chromium Fischer carbenes as a source of chromium carbonyls by Kim, Seongjin, Choi, Soo Young, Lee, Young Tak, Park, Kang Hyun, Sitzmann, Helmut, Chung, Young Keun

“…Chromium Fischer carbene complexes, [Cr{ OMe(R)}(CO) 5] have been utilized as a source of chromium carbonyls in the synthesis of chromium NHC complexes. Using…”
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Merging Cobalt-Catalyzed C–H Activation with the Mannich Reaction: A Modular Approach to α‑Substituted N‑Sulfonyl Amines by Olu-Igbiloba, Oluwaseun A., Sitzmann, Helmut, Manolikakes, Georg

“…A three-component synthesis of α-substituted N-sulfonyl amines from aryl aldehydes, primary sulfonamides, and (hetero)­arenes is described. This transformation…”
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High-Spin Cyclopentadienyl Complexes: A Single-Molecule Magnet Based on the Aryl-Iron(II) Cyclopentadienyl Type by Weismann, Daniel, Sun, Yu, Lan, Yanhua, Wolmershäuser, Gotthelf, Powell, Annie K., Sitzmann, Helmut

“…The mononuclear high‐spin iron(II) complex 1, coordinated by a pentaisopropylcyclopentadienide and an aryl group (see graphic), has been prepared and…”
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Synthesis of Symmetric Metallocenes from Metallic Calcium, Strontium, or Barium and Pentaisopropylcyclopentadienyl Radicals by Sitzmann, Helmut, Dezember, Thomas, Ruck, Michael

“…The largest interplanar distance known to date between adjacent parallel rings of any sandwich compound (5.497(3) Å) is displayed by decaisopropylbarocene, the…”
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The Bonding Situation in the Dinuclear Tetra-Hydrido Complex [{5CpFe}2(μ-H)4] Revisited by Hard X‑Ray Spectroscopy by Burkhardt, Lukas, Mueller, Carsten, Groß, Oliver A, Sun, Yu, Sitzmann, Helmut, Bauer, Matthias

“…High energy resolution fluorescence detected XANES (HERFD-XANES) and valence-to-core X-ray emission spectroscopy (VtC-XES) are introduced as powerful tools to…”
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Chromium(II) Alkylcyclopentadienyl Complexes with Carbon or Hydride Donor Ligands by Smytschkow, Igor, Gidt, Wjatscheslaw, Sun, Yu, Langer, Jens, Böttcher, Tobias, Kubíčková, Lenka, Kaman, Ondřej, Sitzmann, Helmut

“…Alkylcyclopentadienylchromium­(II) bromide dimers [Cp‴Cr­(μ-Br)]2 and [5CpCr­(μ-Br)]2 (Cp‴ = tri­(tert-butyl)­cyclopentadienide, 5Cp =…”
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Group IV Metal Dimethylamido Complexes of the Chiral Cyclopentadienyl‐type Ligand (CpC)–1 by Nährig, Florian, Lauk, Sergej, Sun, Yu, Sitzmann, Helmut, Thiel, Werner. R.

“… Trisdimethylamido complexes of the Group IV elements titanium, zirconium and hafnium bearing the chiral Cp‐type ligand (CpC)–1 were synthesized and…”
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Chromium(III) and Chromium(II) Phenolate Complexes with Bulky Alkylcyclopentadienyl Ligands by Smytschkow, Igor, Gidt, Wjatscheslaw, Kunz, Christoph, Sun, Yu, Langer, Jens, Oelkers, Benjamin, Böttcher, Tobias, Sitzmann, Helmut

“…The chromium(II) tricarbonyl methyl complex [Cp′′′Cr(CO)3CH3] (1, Cp′′′ = η5‐C5H2tBu3‐1,2,4) was obtained from chromium hexacarbonyl, NaCp′′′, and methyl…”
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Paramagnetic Chromium(II) Complexes and Chromium(IV) Nitrides with Bulky Alkylcyclopentadienyl Ligands by Gidt, Wjatscheslaw, Smytschkow, Igor, Sun, Yu, Langer, Jens, Böttcher, Tobias, Kratzert, Daniel, Klingele, Julia, Oelkers, Benjamin, Sitzmann, Helmut

“…Easily available chromium(II) acetate was used for an entry into chromium chemistry: sodium tetraisopropylcyclopentadienide (Na4Cp), sodium…”
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Iron(II) High‐Spin and Low‐Spin Complexes from Pentaisopropylcyclopentadienyliron(II) Bis(trimethylsilyl)amide by Groß, Oliver A., Lauk, Sergej, Müller, Carsten, Gidt, Wjatscheslaw, Sun, Yu, Demeshko, Serhiy, Meyer, Franc, Sitzmann, Helmut

“…Two new complexes, [(C5Me5)FeBr(tmeda)] (tmeda = tetramethylethylenediamine) and [{C5(CHMe2)5}FeN(SiMe3)2], have been synthesized and characterized as…”
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Iron(III) Half‐Sandwich Complexes of the Two‐Legged Piano‐Stool [CpFe(aryl)Cl] Type from the Corresponding Aryliron(II) Precursors by Bauer, Heiko, Wallasch, Mark W., Wolmershäuser, Gotthelf, Sun, Yu, Sitzmann, Helmut

“…Instead of reacting with the σ‐mesityliron(II) complex [Cp′′′Fe(σ‐C6H2Me3‐2,4,6)] (1; Cp′′′ = 1,2,4‐tri‐tert‐butylcyclopentadienyl) to form a…”
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Complexes of Platinum Group Elements Containing the Intrinsically Chiral Cyclopentadienide Ligand (CpC)−1 by Nährig, Florian, Gemmecker, Gerd, Chung, Jae-Yeon, Hütchen, Patrick, Lauk, Sergej, Klein, Matthias P, Sun, Yu, Niedner-Schatteburg, Gereon, Sitzmann, Helmut, Thiel, Werner R

“…Cyclopentadienide derivatives possessing intrinsic helical chirality have only rarely been published in the past. The ligand CpCH, which is well-accessible…”
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Bis(η-1-tert-butyl-inden-yl)nickel(II) by Bauer, Heiko, Sun, Yu, Sitzmann, Helmut

“…The title compound, [Ni(C(13)H(15))(2)], shows a slightly distorted sandwich structure with two independent mol-ecules in the asymmetric unit. Both Ni atoms…”
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Iron-Mediated Coupling of Two Ethyl Anions to Form a 2-Butyne Ligand by Bauer, Heiko, Weismann, Daniel, Wolmershäuser, Gotthelf, Sun, Yu, Sitzmann, Helmut

“…The σ‐aryliron complexes [5CpFe(C6H3iPr2‐2,6)] (2, 5Cp = η5‐C5iPr5) and [4CpFe(C6H3iPr2‐2,6)] (6, 4Cp = η5‐C5HiPr4) are available from the halides…”
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Cyclononatetraenyl-Indenyl Transformation and a Zirconium(III) Trimer from Bulky Alkylcyclopentadienylzirconium Chlorides by Schäfer, Sebastian, Bauer, Heiko, Becker, Julia, Sun, Yu, Sitzmann, Helmut

“…Structure determinations of the known titanium, zirconium, and hafnium trichloro‐di(tert‐butyl)cyclopentadienyl complexes [Cp″MCl3] {Cp″ = η5‐C5H3tBu2, M = Zr…”
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Benzylidyne Bridges from Diphenylacetylene and a Methylidyne Bridge from Methylmagnesium Chloride by Vollmer, Guy Y, Wallasch, Mark W, Saurenz, Dirk, Eger, Tobias R, Bauer, Heiko, Wolmershäuser, Gotthelf, Prosenc, Marc H, Sitzmann, Helmut

“…Preparation of the dimeric starting compound [(C5H2 tBu3-1,2,4)Fe(μ-Br)]2 (1) gave a small amount of its green sodium bromide adduct [(C5H2…”
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Cyclopentadienide Ligand CpC– Possessing Intrinsic Helical Chirality and Its Ferrocene Analogues by Chung, Jae-Yeon, Schulz, Christian, Bauer, Heiko, Sun, Yu, Sitzmann, Helmut, Auerbach, Hendrik, Pierik, Antonio J, Schünemann, Volker, Neuba, Adam, Thiel, Werner R

“…The novel chiral cyclopentadiene-type ligand CpCH is accessible from dibenzosuberenone in a five-step sequence with overall yields of 64%. NMR spectroscopy as…”
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