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  • 1
    Electronic Resource
    Electronic Resource
    Synthesen 3-substituierter Cyclohexenon-Derivate (1956)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 89 (1956), S. 600-610 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden Cyclohoxenon-Derivate mit einer Essigsäure, β-Amino-äthyl- oder Vinyl-Seitenkette in 3-Stellung synthetisiert. Die Verfahren gehen aus entweder vom Resorcin oder vom m-Methoxy-benzaldehyd und liefern in beiden Fällen gute Ausbeuten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19560890304
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  • 2
    Electronic Resource
    Electronic Resource
    Eine einfache Synthese von dimetallischen Zirconium/Aluminium-Verbindungen mit planar-tetrakoordiniertem Kohlenstoff (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1953-1956 
    Details
    ISSN: 0009-2940
    Keywords: Zirconium-aluminium dimetallic complexes ; Carbon, planar-tetracoordinate ; μ-Alkyne complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Simple Synthesis of Dimetallic Zirconium/Aluminium Compounds Containing Planar-Tetracoordinate Carbon(η2-Alkyne)(trimethylphosphane)zirconium complexes [alkyne = cyclohexyne (3a) or diphenylacetylene (3b)] react with diisobutylaluminium hydride at room temperature by PMe3 cleavage and addition of H—Al(isobutyl)2 to the in situ-generated (η2-alkyne)ZrCp2 intermediate to give the dimetallic Zr,Al compounds 4. These thermodynamically stable complexes contain a planar-tetracoordinate carbon center whose uncommon coordination geometry is stabilized by a combination of the s̰-donor interaction with both electropositive metals and the π-conjugation of the Zr—C = C moiety.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250823
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of a [4Fe-4S]-Ferredoxin Model Based on a Concave Tetradentate Thiol Ligand System (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 23-34 
    Details
    ISSN: 0009-2940
    Keywords: Cavitand ; Electrochemistry ; Iron sulfur cluster ; Metalloprotein model ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: NMR and Mössbauer spectroscopy show that a novel tetrathiol ligand, based on the cavitand diphenylglycoluril, encapsulates a 4Fe-4S cluster and induces asymmetry in it. The cluster gives a weak electrochemical current response in DMF, with a half-wave potential for the 2-/3- reduction vs. Fc+/Fc of -1.7 V. Ba2+ ions are adsorbed, according to X-ray analysis of the SEM image of the electrode, and act as modulator and promoter of the electrochemical response. On the basis of cyclic voltammograms it is proposed that this adsorption creates electroactive sites, changing the type of diffusion controlling the mass transport to the electrode from radial to linear, and that it helps the negatively charged complex, which contains a dipole, to approach the negative electrode in an orientation favourable for electron exchange. This feature makes the complex an important model for ferredoxins, in spite of a difference in redox potential.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300105
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  • 4
    Electronic Resource
    Electronic Resource
    übergangsmetall-substituierte Acylphosphane und Phosphaalkene, XV. Zur Umsetzung des Phosphaallylkomplexes (η5-C5Me5)(CO)Fe-{η3-P[CH(SiMe3)2](CHC=O)} mit Chalcogenen und Fe2(CO)9 (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 989-996 
    Details
    ISSN: 0009-2940
    Keywords: Phosphaallyl complexes ; Chalcogenes ; Düron, enneacarbonyl ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition-Metal-Substituted Acylphosphanes and Phosphaalkenes, XV. - Reaction of the Phosphaallyl Complex (η5-C5Me5)(CO)Fe{η3-P[CH(SiMe33)2](CHC=O}} with Chalcogenes as well as with Fe2(CO)9The (η3-phoshaalyl)iron complex (η5-C5Me5)(CO)Fe{η3-P(CH(SiMe3)2](CHC=O)} (1) is oxidized by sulfur and selenium to afford the methylenethioxo- and methyleneselenoxophosphorane complexes 4 and 5 with an anti-configuration of the CH(SiMe3)2 substituent relative to iron. The chalcogene atoms are attached to the phosphorus atom of the ligand and do not participate in the bonding to the metal Equivalent amounts of 1 and Fe2(CO)9 lead to the phosphaalkenyl complex 6 with an Fe - C σ bond. On the other hand, a large excess of Fe2(CO)9 converts 1 as well as 6 into the cluster compound 7 featuring the bridging 1-oxa-4-phosphabutadiene ligand (η5-C2Me5)(CO)2Fe - C(O) - CH=P - CH(SiMe3)2. Constitution and configuration of all compounds have been elucidated by spectroscopic methods (IR, 1H, 13C, 31P NMR, and MS). In addition complexes 5 and 7 have been characterized by single crystal X-ray diffraction analyses.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240504
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  • 5
    Electronic Resource
    Electronic Resource
    Nitrile Addition to (η4-Butadiene)zirconocene: The Formation of Organometallic and Metal-Free Hexatrienediamine Derivatives (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1669-1673 
    Details
    ISSN: 0009-2940
    Keywords: Butadiene dianion equivalent, 1,4-addition ; Metallocene template, bent ; Enamine, primary, stable ; Metallacycles, nine-membered, chiral ; Zirconocene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (η4-Butadiene)zirconocene adds one equivalent of benzonitrile to form the five-membered azazirconacyclopentene derivative 7, which contains an NH group in the ring and a vinyl substituent at the α-carbon center. The reaction of 7 with an additional equivalent of benzonitrile furnishes the chiral nine-membered metallacycle () (12) which may be isomerized to the thermo-dynamically favored tautomer () (13). The Gibbs activation energy of the enantiomerization of the trans-cycloalkene-like 13 is ΔG#(323 K) = 15.5 ± 0.3 kcal mol-1. The analogous conformational equilibration of 12 has a lower activation barrier of ΔG# (236 K) = 12.1 ± 0.3 kcal mol-1; complex 13 is characterized by X-ray diffraction. Hydrolysis of 13 yields the conjugated 1,6-diamino-1,6-diphenylhexatriene 16 which is characterized by X-ray diffraction.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250724
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  • 6
    Electronic Resource
    Electronic Resource
    Monoazadien-Komplexe elektronenarmer Übergangsmetalle, I. Zirconocen(1-aza-1,3-dien)1-Komplexe: Synthese, Struktur und Reaktionen (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 803-809 
    Details
    ISSN: 0009-2940
    Keywords: Zirconocene complexes ; Heterodiene complexes ; 1-Azadiene ; Carbonyl insertion ; Enamine ; Homoenolate equivalent ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Monoazadiene Complexes of Electron-Deficient Transition Metals, I. - Zirconocene(1-aza-1,3-diene) Complexes: Synthesis, Structure and Reactions[1]The reduction of Cp2ZrCl2 in THF by Mg in the presence of 1-aza-1,3-dienes 2a-d generates the orange air-sensitive zirconocene(s-cis-1-aza-1,3-diene) complexes 3a-d. 1H-and 13C-NMR spectral data of 3a-d indicate that the bonding of the heterodiene ligand has σ2,π1-metallacyclopentene rather than η4-1-aza-1,3-diene character. No evidence for s-trans1-heterodiene coordination was found in any of the new zirconocene complexes. The molecular structure of 3d has been determined by single-crystal X-ray diffraction, confirming the envelope-shaped σ2,π1-type structure also in the solid state. 3b slowly reacts with one molar equivalent of acetophenone to give a seven-membered oxaazametallacycle (4) which has a cis1-C=C bond in the ring. The structure of 4 has been determined by NMR and X-ray diffraction.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260335
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  • 7
    Electronic Resource
    Electronic Resource
    Subsite-Specific Reactions of a Cyclotriveratrylene [4Fe-4S] Cluster Complex (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1151-1157 
    Details
    ISSN: 0009-2940
    Keywords: Iron-sulfur clusters ; S ligands ; Cyclotriveratrylene ; Subsite-specific reactions ; Electrochemistry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ligand exchange reactions are carried out exclusively at the unique iron site of a subsite-differentiated cyclotriveratrylene [4Fe-4S] cluster complex. The effect of a variety of thiolate, phenolate, bidentate, and bridging ligands on the redox potential of the subsite-differentiated [4Fe-4S] cluster complex is studied and compared with the effects of such ligands on an [Fe4S4C14]2- cluster. The redox potential can be modulated within the range of -1.60 to -1.80 V (vs. Fc0/+) by varying the ligand. The introduction of an electron releasing substituent shifts the redox potential to more negative values, whereas an electron withdrawing substituent has the opposite effect. A linear relationship exists between the number of substituted sites and the reduction potential of the cluster.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300819
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  • 8
    Electronic Resource
    Electronic Resource
    Kryometrische Untersuchungen an geschmolzenen Alkaliwolframaten. I. Bestimmung der Schmelzenthalpien (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 371 (1969), S. 149-155 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: By means of DTA the enthalpies of melting and, partly, of transformation of several alkali metal tungstates and ditungstates, K2Cr2O7 and Li2SO4 have been estimated.
    Notes: Mit einer Apparatur für Differentialthermoanalyse wurden die Schmelzenthalpien und z. T. auch Umwandlungsenthalpien einer Anzahl Alkaliwolframate und -diwolframate, sowie von Kaliumdichromat und von Lithiumsulfat bestimmt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693710306
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  • 9
    Electronic Resource
    Electronic Resource
    Kryometrische Untersuchungen an geschmolzenen Alkaliwolframaten. II. Über den Dissoziationszustand von Alkalimonowolframaten und -diwolframaten in Salzschmelzen (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 371 (1969), S. 156-171 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The cryoscopical behaviour of the following electrolytes has been investigated: KCl, Li2WO4, WO3-dissoved in molten K2WO4, BaWO4, Li2WO4, Na2WO4, WO3-dissolved in molten Na2W2O7; K2CrO4, Na2W2O7, Li2W2O7, M2WO4 (M = Li, Ma, K)-dissolved in molten K2Cr2O7. The results are interpreted on the basis of TEMKIN'S model of molten electrolytes. Pure molten Na2W2O7 dissoziates into Na+, WO2-4, and WO3. In diluted solutions of alkali ditungstates in molten K2Cr2O7 probably W2O7 probably W2O2-7 ions occur. Alkali monotungstates in K2Cr2O7, however, exhibit a complicated behaviour due to chemical reaction with the solvent.
    Notes: Das kryoskopische Verhalten folgender Elektrolyte wurde untersucht: 1gelöst in geschmolzenem K2WO4: KCl, Li2WO4, WO3.2gelöst in geschmolzenem Na2W2O7: BaWO4, Li2WO4, Na2WO4, WO3.3gelöst in geschmolzenem K2Cr2O7: K2CrO4, Na2W2O7, Li2W2O7, Li2WO4, Na2WO4, K2WO4.Die kryoskopischen Messungen wurden unter Zugrundlegung des TEMKIN-Modells für geschmolzene Elektrolyte gedeutet. Es konnte u. a. nachgewiesen werden, daß reines geschmolzenes Na2W2O7 in Na+, (WO4)2- und WO3 dissoziiert. In verdünnten Lösungen von Alkalidiwolframaten im relativ niedrig schmelzenden K2Cr2O7 liegen wahrscheinlich (W2O7)2--Ionen vor Alkalimonowolframate zeigen infolge Reaktion mit dem Lösungsmittel K2Cr2O7 kryoskopisch ein komplizierteres Verhalten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693710307
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  • 10
    Electronic Resource
    Electronic Resource
    A Convenient Synthesis of New Macrocyclic NaphthalenophanesDedicated to Professor E. V. Dehmlow on the occasion of his 60th birthday. (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1157-1162 
    Details
    ISSN: 0009-2940
    Keywords: Cyclophanes ; Naphthalenophanes ; McMurry reaction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The (1,4)naphthalenophanes 6a, 6b, 7a, and 7b were synthesized regiospecifically in two steps from the appropriate α,β-di-1-naphthylalkanes by a Friedel-Crafts acetylation of the two naphthalene groups followed by cyclization/dimerization of the resulting diketones by a McMurray reaction. The macrocyclic naphthalenophanes 6a and 6b exist in solution as a mixture of conformers while 7a and 7b were identified as the anti isomers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270629
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