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  • Wiley-Blackwell  (36)
  • 1995-1999  (12)
  • 1990-1994  (24)
  • 1
    Electronic Resource
    Electronic Resource
    Se2NBr3, Se2NCl5, Se2NCl-6: New Nitride Halides of Selenium(III) and Selenium(IV) (1996)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 2 (1996), S. 1373-1378 
    Details
    ISSN: 0947-6539
    Keywords: ab initio calculations ; crystal structure ; halogen compounds ; nitrides ; selenium compounds ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Se2NBr3, a planar molecule shaped liked dividers, was formed by the reaction of SeBr4 with N(SiMe3)3, which reduced the selenium to the trivalent state. Under the same conditions, Se2NCl5 was obtained by the reaction of SeCl4 with N(SiMe3)3, retaining the tetravalent state of selenium. The molecule is formed by two edge-sharing pseudotrigonal bipyramids with selenium as their central atoms. Se2NCl5 reacts with PPh4Cl to form the Se2NCl-6 ion by the addition of a Cl- ion to only one of the two selenium atoms, resulting in pseudooctahedral coordination of this atom. Ab initio calculations for all the compounds reported confirm the experimentally determined structures.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19960021108
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  • 2
    Electronic Resource
    Electronic Resource
    Fluoroderivate von Diphenylacetylenkomplexen des Wolframs Die Kristallstruktur von [Na-15-Krone-5][WF5(PhC≡CPh)] (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 582 (1990), S. 7-14 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fluoroderivatives of Diphenylacetylene Complexes of Tungsten. Crystal Structure of [Na-15-crown-5] [WF5(PhC≡CPh)]The reactions of [WCl4(PhC≡CPh)]2 with lithium fluoride, sodium fluoride, and potassium fluoride in acetonitrile suspensions lead in presence of the corresponding crown ethers to the complexes [Li-12-crown-4][WFCl4(PhC≡CPh)] (1), [Na-15-crown-5][WF5(PhC≡CPh)] (2), and [K-18-crown-6][WF5(PhC≡CPh)] (3), respectively. The compounds form orange-yellow crystal powders, soluble in acetonitrile, and only sparingly moisture sensitive. 1-3 are characterized by IR spectroscopy, 2 also by its 13C-nmr spectrum. The crystal structure of 2 was solved by X-ray methods. Space group P212121, Z = 4, 4555 observed unique reflexions, R = 0.039. Lattice dimensions at 20°C: a = b = 1403.4(2); c = 1335.6(2) pm. [Na-15-crown-5][WF5(PhC≡CPh)] forms ion pairs via two Na—F contacts with bond lengths of 226.0 and 257.4 pm; thus the sodium ion being sevenfold coordinated by the five oxygen atoms of the crown ether molecule and by two fluorine ligands. The diphenylacetylene ligand is side on bonded to the tungsten atom of the [WF5(PhC≡CPh)]- unit with W—C bond lengths of 202.9 and 204.9 pm, respectively, corresponding to a metallacyclopropene structure.
    Notes: Die Reaktionen von [WCl4(PhC≡CPh)]2 mit Lithiumfluorid, Natriumfluorid bzw. Kaliumfluorid führen in Acetonitrilsuspensionen in Gegenwart der entsprechenden Kronenether zu den Komplexen [Li-12-Krone-4][WFCl4(PhC≡CPh)] (1), [Na-15-Krone-5][WF5(PhC≡CPh)] (2), bzw. [K-18-Krone-6][WF5(PhC≡CPh)] (3). Die Verbindungen bilden gelborange diamagnetische Kristallpulver, die in Acetonitril leicht löslich, im trockenen Zustand nur wenig feuchtigkeitsempfindlich sind. Von 1 bis 3 werden die IR-Spektren mitgeteilt, von 2 auch das 13C-Kernresonanzspektrum. Von 2 wurde auch eine röntgenographische Strukturanalyse ausgeführt. Raumgruppe P212121, Z = 4, 4555 unabhängige beobachtete Reflexe, R = 3,9%. Die Gitterabmessungen betragen bei 20°C: a = b = 1403,4(2); c = 1335,6(2) pm. [Na-15-Krone-5][WF5(PhC≡CPh)] bildet Ionenpaare, in denen die durch die Kronenethermoleküle komplexierten Na+-Ionen mit zwei F-Atomen des Anions [WF5(PhC≡CPh)]- Kontakte mit Na—F-Abständen von 226,0 bzw. 257,4 pm ausbilden. Der Diphenylacetylenligand ist entsprechend einer Metallacyclopropengruppe seitlich an das Wolframatom mit W—C-Abständen von 202,9 bzw. 204,9 pm gebunden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905820102
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  • 3
    Electronic Resource
    Electronic Resource
    Disproportionierung von Schwefeldioxid am Molybdän(0)-Komplex trans-[(dppe)2Mo(N2)2] Molekülstruktur von trans-[(dppe)2Mo(S)O]·SO2·H2SO4 (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 979-982 
    Details
    ISSN: 0009-2940
    Keywords: Chalkogenido complex, mixed, of molybdenum ; Disproportionation of SO2 ; Sulfur, dioxide, monoxide ; Oxidative addition of SO ; Molybdenum complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Disproportionation of Sulfur Dioxide by the Molybdenum(0) Complex trans-[(dppe)2Mo(N2)2]. Molecular Structure of trans-[(dppe)2Mo(S)O]·SO2·H2S04Sulfur dioxide disproportionates into sulfur monoxide and sulfuric acid, when it is passed through a solution of the molybdenum(0) complex trans-[(dppe)2Mo(N2)2] (1) in toluene. Whereas SO undergoes an oxidative addition reaction onto the intermediate 14 VE-complex fragment (dppe)2Mo to give the mixed dichalkogenidomolybdenum(IV) complex trans-[(dppe)2Mo(S)O] (3), both molecules H2SO4 and intact SO2 remain in the solvating sphere. According to an X-ray structural analysis 3 crystallizes in the monoclinic space group P21/n and shows an octahedral configuration at the central molybdenum atom with the oxo and sulfido ligands in trans positions; the two solvent molecules ethanol and toluene are also incorporated into the crystal lattice.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230508
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und Eigenschaften von und Reaktionen mit metallhaltigen Heterocyclen, LXXVII Synthese, Struktur und Reaktivität von Phosphametallacyclopropanen mit isolobalen ER- (E = N, P, As, Sb) und Fe(CO)4-Bausteinen (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2171-2179 
    Details
    ISSN: 0009-2940
    Keywords: Phosphametallacyclopropanes ; Isolobal building blocks ; Lewis basic behavior ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal-Containing Heterocycles: Preparation, Properties, Reactions, LXXVII. - Synthesis, Structure and Reactivity of Phosphametallacyclopropanes with Isolobal ER (E = N,P,As,Sb) and Fe(CO)4 Building BlocksThe phosphidometallates \documentclass{article}\usepackage{amsmath}\pagestyle{empty}\begin{document}$ Li_2 \left\{ {\left[ M \right]\dddot - PPh_2 } \right\} $\end{document} {[M] = (η5-C5H5)M-(CO)2}, resulting from the metal hydride complexes H[M]PPh2H [M = Cr (1), Mo (2), W (3)] by reduction with nBuLi, react with the geminal dihalides RECl2 to give the three-membered phosphametallacyclopropanes [ER = NC6F5 (M = Cr (1a), Mo (2a), W (3a)), PPh (M = Cr (1b), Mo (2b), W (3b)), PC6H11 (M = Cr (1c), Mo (2c), W (3c)), P-tBu (M = Cr (1d), Mo (2d), W (3d)), P(2,4,6-(tBu)3C6H2) (M = Cr (1e), Mo (2e), W (3e)), As(2,4,6-(tBu)3C6H2) (M = Cr (1f), Mo (2f), W (3f)), Sb-tBu (M = Cr (1g), Mo (2g))]. Reaction of Br2Fe(CO)4 with the corresponding dilithium compounds \documentclass{article}\usepackage{amsmath}\pagestyle{empty}\begin{document}$ Li_2 \left\{ {\left[ M \right]\dddot - PPh_2 } \right\} $\end{document} affords the phosphido-bridged heterodimetallic complexes . According to X-ray structural analyses in 2a and 2f the P - E bond distances are shortened while the Mo - E bonds are significantly elongated compared to a single bond. (OC)5CrTHF is added to the Lewis basic E atom in 2b, 2d, and 2g with loss of THF to give P-tBu (4d), Sb-tBu (4g)]. By this reaction the antimony-containing ring 2g is kinetically stabilized. Because of the low basicity of the N atom in 2a no addition was observed. The ring skeleton of 4b and 4g, undergoes no change by Cr(CO)5 coordination as shown by X-ray structural analyses.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241005
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  • 5
    Electronic Resource
    Electronic Resource
    Synthese und Struktur von Schwefel-, Schwefelmonoxid- und Schwefeldioxid- verbrückten dimetallischen Komplexen des Typs [M(CO)(dppm)]2(μ-S)(μ-L) und [(CO)3M'(dppm)2MX](μ-L') (M = Rh, Ir; M' = Mo, W, Mn; L = SO, SO2; L' = S, SO2; X = Cl, CO) (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2217-2222 
    Details
    ISSN: 0009-2940
    Keywords: A-Frame complexes ; SO2-bridged complexes ; S, SO, and SO2 ligands ; Insertion reactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Structure of Sulfur-, Sulfur Monoxide-, and Sulfur Dioxide-Bridged Dimetallic Complexes of the Type [M(CO)(dppm)]2(μ-S)(μ-L) and [(CO)3M'(dppm)2MX](μ-L') (M = Rh, Ir; M' = Mo, W, Mn; L = SO, SO2; L' = S, SO2; X = Cl, CO)The homo- and heterodimetallic complexes [M(CO)(dppm)]2-(μ-S)(μ-SO2) (M = Rh, Ir) (2a, b), [(CO)3M'(dppm)2MCl](μ-SO2) (M' = Mo, W; M = Rh, Ir) (4a - c), and [(CO)3Mn(dppm)2- Rh(CO)] (6) by passing sulfur dioxide through their solutions. The X-ray structure analysis of 5a shows the SO2 ligand in a bridging position, whereas one CO ligand is semibridging. Treatment of the same starting materials with thiirane S-oxide does not lead to the corresponding SO-bridged dimers, with the only exception of 1b, which yields the new SO complex [(Ir(CO)(dppm)]2(μ-S)(μ-SO) (3b). Passing H2S through a solution of 6, the sulfur-bridged complex [(CO)3Mn(dppm)2- Rh(CO)](μ-S) (8) is formed, accompanied by H2 elimination.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241012
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  • 6
    Electronic Resource
    Electronic Resource
    η1-P- und η2-OP-gebundene (Ether-phosphan)osmium(II)-Komplexe und ihre gegenseitige Umwandlung (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 541-550 
    Details
    ISSN: 0009-2940
    Keywords: Ether phosphanes ; Osmium(II) complexes ; Conversion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: η1-P- and η2-OP-Bonded (Ether-Phosphane)Osmium(II) Complexes and their Mutual ConversionReactions of cis-Br2Os(CO)4 with the (ether-phosphane) ligands 2a-f results in the formation of the cis,cis,trans-complexes Br2Os(CO)2(P ∼ O)2 (3a-f). 3b crystallizes in the mono-clinic space group P21/c with Z = 4. Irradiation of 3a-f leads to the cleavage of a further CO group and the formation of an Os—O bond to give the mono(chelate) complexes Br2Os(CO)-(PO) PO (5a-f), with one of the O,P ligands being bidentate. 5a-f exist as mixtures of different trans-P (A,B) and cis-P isomers (C-G). Dependent on the fact that a reversible cis/trans equilibrium or an irreversible trans → cis transformation is possible or that no trans-P isomers are present at any temperature, 5a-f may be classified in three categories. Inter-conversion of the isomers A-G results from dissociation of the η1-P coordinated ether-phosphane and concomitant occurrence of the 16e- species Br2Os(CO)(PO) (8). From temperature-dependent 31P{1H}-NMR spectroscopic investigations the temperature for the reversible opening of the metal-oxygen contact is determined. The reversible opening leads to the complexes Br2Os(CO)(PO)2 (9) with a vacant coordination site depending on the Os-O bonding strength. 5a-f react with CO to give all-trans-Br2Os(CO)2(PO)2 (4a-f). The action of the ether-phosphanes 2a-f on OsBr2(PPh3)4 (7) affords the bis(chelate) complexes Br2Os(PO)2 (6a-f) which add carbon monoxide to form all-trans-4a-f.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250303
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  • 7
    Electronic Resource
    Electronic Resource
    Stereoelectronic and Steric Effects in the Synthesis and Recognition of Diastereomeric Ethers by NMR and EPR SpectroscopyHerrn Professor Ernst Buyer zum 65. Geburtstag gewidmet. (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 857-865 
    Details
    ISSN: 0009-2940
    Keywords: Quinone methides ; Stereoelectronic effects ; Chiral recognition ; EPR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (2,6-Di-tert-butyl-4-hydroxyphenyl)-alkyl-carbinols I are easily dehydrated in the presence of catalytic amounts of a mineral acid to form the corresponding phenyl-alkyl-carbocations Ia. These cations can be reversibly deprotonated to the quinone methides Ib, therefore, an equilibrium between both reactive compounds is assumed. In the absence of nucleophiles a reaction of these intermediates with the starting carbinol is observed leading to symmetrical ethers Id. In alcoholic solution the solvent acts as a nucleophilic compound and the formation of an unsymmetrical ether Ie is observed predominantly. If the nucleophile contains a chiral carbon atom diastereomers are formed in this reaction which are observed in variable concentrations depending on the reaction time. The assignment of these isomers to the meso and racemic compound has been achieved by NMR investigations in solution in combination with their solid-state structures determined by X-ray crystallography. These results indicate a remarkable thermodynamic stabilization of the symmetrical ethers in the racemic form whereas the meso compounds are favored if the products are formed under kinetic control. In both cases the diastereomer ratio is determined by steric repulsion and the generalized anomeric effect. - A bonding interaction of lone pairs of the ether oxygen with the π system of the corresponding phenoxyl ring was also observed by EPR investigations. This electron delocalization contributes remarkably to the mechanism responsible for the distinction of the diastereomeric radicals by different β-proton coupling constants.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250417
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  • 8
    Electronic Resource
    Electronic Resource
    Neuartige basische Liganden für die homogenkatalytische Methanolcarbonylierung, XXXVIII. Synthese, Eigenschaften und fluktuierendes Verhalten von (Ether-Phosphan)palladium-Komplexen (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 2255-2260 
    Details
    ISSN: 0009-2940
    Keywords: Ether-phosphines ; Palladium complexes ; Fluxional behavior ; Hydrogenation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Novel Basic Ligands for the Homogeneous Catalytic Carbonylation of Methanol, XXVIII.  -  Synthesis, Properties and Fluxional Behavior of (Ether-Phosphine)palladium ComplexesCl2Pd(COD) (1) (COD = 1,5-cyclooctadiene) reacts with 1 equiv, of the (ether-phosphine) ligand Ph2P∼D (2a-c) (D = CH2C4H7O (a), CH2C4H7O2 (b), CH2CH2OCH3 (c)] to give the dimeric complexes [μ-ClPdCl(Ph2P∼D)]2 (3a-c) (P∼D = η1-P-coordinated). According to the field-desorption mass spectra which show only one peak for the monomeric moieties ClPd(Ph2P∼D), 3a-c have a very weak Pd2Cl2 bridge. trans-Cl2Pd(Ph2P∼D)2 (4a-c) is obtained either from 3a-c and 2a-c by cleaving the Pd2Cl2 bridge or from 1 and 2 equiv. of the ligands 2a-c. 4c crystallizes in the monoclinic space group P21/c with Z = 2. AgClO4 selectively abstracts one Cl⊖ ligand from 4a-c which results in the formation of the cationic complexes [trans-(Ph2P∩D)(Ph2P∼D)PdCl]⊕ (5a-c) (P∩D = η2-D,P-coordinated) containing one chelated and one η11-P-bonded (ether-phosphine) ligand. 5a-c show fluxional behavior which is demonstrated by temperature-dependent 31P{1H}-NMR investigations. The coalescence points have been determined and are at 253 (5a), 303 (5b), and 283 K (5c). The activation enthalpies ΔG
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901231205
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  • 9
    Electronic Resource
    Electronic Resource
    Die Kristallstrukturen von {Li3(12-Krone-4)2[HC(CN)2]3}, {Na(15-Krone-5)-[HC(CN)2]} und {Na[N(nBu)4][HC(CN)2]2 · THF} (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 87-92 
    Details
    ISSN: 0009-2940
    Keywords: Lithium dicyanomethanide ; Sodium dicyanomethanide ; Dicyanomethanides, lithium, sodium, tetrabutylammonium salts ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Crystal Structures of {Li3(12-crown-4)2[HC(CN)2]3}, {Na(15-crown-5)[HC(CN)2]}, and {NaN(nBu)4[HC(CN)2]2 · THF}The preparation and the crystal structures of the title compounds 1 - 3 are described. 1 forms a polymeric chain structure, in which one of the lithium ions is linked by Li…NCC(H)CN… bridges. The remaining lithium ions form (12-crown-4)Li[NCC(H)CN] units, which are coordinated by one of the nitrogen atoms of the dicyanomethanide ions with the lithium ions of the chain. 2 forms an ion pair, in which the sodium ion is coordinated by the five oxygen atoms of the crown ether molecule and by one nitrogen atom of the dicyanomethanide ion. 3 has a threedimensional network, in which the sodium ions are coordinated in a distorted tetrahedral manner by the nitrogen atoms of the dicyanomethanide ions. In the cavities of the network the tetrabutylammonium ions and the THF molecules are found.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250114
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  • 10
    Electronic Resource
    Electronic Resource
    Tris(trimethylsilyl)arsan als Edukt für Tri- und Tetraferrioarsonium-Salze; Kristallstruktur von [{Cp(CO)2Fe}3AsOH]B(C6H5)4 (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 251-256 
    Details
    ISSN: 0009-2940
    Keywords: Arsonium salts, tri- and tetraferrio- / Arsane, tris(trimethylsilyl)- / Permetalated tetrahedral main group elements ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tris(trimethylsily1)arsane as a Starting Compound for Tri- and Tetraferrioarsonium Salts; Crystal Structure of [{Cp(CO)2Fe}3AsOH]B(C6H5)4Tris(trimethylsilyl)arsane (1) reacts with an excess of CpFe(O)2Cl (2) to give tetraferrioarsonium chloride [{Cp(CO)2Fe}4As]Clk (4a), which may be converted into the corresponding tetraphenylborate 4b by Na[B(6H5)4]. In the Presence of water one organometallic ligand is hydrolysed to yield the triferriohydroxyarsonium tetraphenylborate 5 which crystallizes in the triclinic space group P&1bar; and shows a trigonal pyramidal configuration at the arsenic atom.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230205
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