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  • Inorganic Chemistry  (29)
  • 2020-2023
  • 1995-1999  (14)
  • 1970-1974  (9)
  • 1965-1969  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis, Characterization and Dynamic Behavior of (π-Allyl)palladium Complexes with Polydentate Nitrogen Ligands, Evidence of a Dissociative Mechanism (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 589-594 
    Details
    ISSN: 0009-2940
    Keywords: Fluxionality ; Heterocyclic ligands ; Palladium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New examples of the fluxional behavior of (η3-allyl)palla-dium complexes are described. Variable-temperature experiments and line-shape analysis of two (η3-allyl)palladium complexes containing 2-(1H-pyrazol-1-yl)azine ligands were performed in order to determine the activation free energies, enthalpies and entropies of the process. A dissociative mechanism pointing to a selective Pd-N cleavage is proposed on the basis of these results and NOE experiments above and below the coalescence temperature.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290519
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  • 2
    Electronic Resource
    Electronic Resource
    Dispiro[2.0.2.4] deca-7,9-dien und Vergleichsverbindungen: Darstellung, UV-, NMR- und Photoelektronen-spektroskopische Untersuchungen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 1684-1701 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dispiro[2.0.2.4]deca-7,9-diene and Related Model Compounds: Synthesis, U.V, N.M.R, and Photoelectron-Spectroscopic InvestigationsDispiro[2.0.2.4]deca-7,9-diene (4) and spiro[2.5]octa-4,6-diene (5 can be obtained from the corresponding monoolefins 6 and 10, respectively, by bromine addition and subsequent dehydrobromination. The u. v. spectra of 5 and 4 with λmax = 269 nm (log ε = 3.4) and 284 nm (3.7), respectively, show bathochromic shifts of their longest wavelength bands as compared to 1,3-cyclohexadiene. An analysis of the 1H n. m. r. chemical shifts and H, H-coupling constants for the olefinic protons in 4 indicates that there is no cyclic electron delocalization in this ring system. The six-membered ring in 4 is only slightly flatter than the one in 1,3- cyclohexadiene. The photoelectron spectroscopic data of 4, 5, spiro[2.5]octane (13), spiro[2.5]oct-4-ene (15), dispiro[2.0.2.4]decane (14), and dispiro[2.0.2.4]dec-7-ene (16) demonstrate the effect of the interaction between π-orbitals and cyclopropyl Walsh-orbitals; an assignment for the first bands in the p. e. spectra of these compounds is proposed.
    Notes: Dispiro[2.0.2.4] deca-7,9-dien (4) und Spiro[2.5]octa-4,6-dien (5) lassen sich aus den entsprechenden Monoolefinen 6 bzw. 10 durch Bromierung und anschließende Dehydrobromierung gewinnen. Die UV-Absorptionen von 5 und 4 mit λmax = 269 nm (log ε = 3.4) bzw. 284 nm (3.7) sind bathochrom verschoben gegenüber denjenigen des 1,3-Cyclohexadiens. Aus einer Analyse der Chemischen Verschiebungen und H,H-Kopplungskonstanten der olefinischen Protonen im 1H-NMR-Spektrum von 4 ist zu schließen, daß 4 kein cyclisch delokalisiertes Elektronensystem enthält. Der Sechsring in 4 ist nur wenig stärker eingeebnet als derjenige im 1,3-Cyclohexadien. Anhand der Photoelektronen-Spektren von 4, 5 sowie Spiro[2.5]octan (13), Spiro[2.5]oct-4-en (15), Dispiro[2.0.2.4]decan (14) und Dispiro[2.0.2.4]dec-7-en (16) wird der Effekt der Wechselwirkung zwischen π-Orbitalen und Cyclopropyl-Walsh-Orbitalen aufgezeigt; für die jeweils ersten Banden in den PE-Spektren dieser Verbindungen wird eine Zuordnung vorgeschlagen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070527
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesen mit heterocyclischen Aminen, VII. Über die Reaktion von Acrylsäureestern mit heterocyclischen Aminen. Struktur der Reaktionsprodukte (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3961-3964 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses with Heterocyclic Amines, VII. Reactions of Acrylates with Heterocyclic Amines. The Structure of the Reaction ProductsThe addition of acrylic esters to 3(5)-aminopyrazole, 3-amino-1.2.4-triazole (4), and 3-amino-s-triazolo[3.4-a]isoquinoline (9) takes place at the ring nitrogen just as in the case of propiolic ester. The condensed oxo-tetrahydro-pyrimidines 1, 5, 6, and 10 are formed. Their structure is proved by catalytic hydrogenation of the addition products 3, 7, 8, and 11, which have been obtained with propiolic ester.
    Notes: Die Addition von Acrylsäureestern an 3(5)-Amino-pyrazol, 3-Amino-1.2.4-triazol (4) und 3-Amino-s-triazolo[3.4-a]isochinolin (9) erfolgt wie im Falle des Propiolsäureesters am Ringstickstoff. Es entstehen die kondensierten Oxo-tetrahydro-pyrimidine 1, 5, 6 und 10. Ihre Struktur wird durch katalytische Hydrierung der mit Propiolsäureester erhaltenen Additionsprodukte 3, 7, 8 und 11 bewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711041226
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und schwingungsspektroskopische Untersuchung der Konformation des BicyclobutylsTeil d. Dissertat. v. A. de Meijere, Univ. Göttingen 1966. (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 2155-2161 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bicyclobutyl (4) entsteht sowohl bei der Umsetzung von Cyclobutylmagnesiumbromid mit Kupfer(II)-chlorid als auch bei der Behandlung von Tri-cyclobutyl-boran mit Silbernitrat in brauchbaren Ausbeuten. Aus dem Vergleich der IR-Spektren der flüssigen und der kristallinen Substanz ist zu schließen, daß in der Flüssigkeit mehrere Konformere des Moleküls im Gleichgewicht vorliegen, während im Kristall nur eine Form existiert. Eine Gegenüberstellung des IR-Kristallspektrums mit dem Raman-Spektrum der Flüssigkeit gibt Anhalt dafür, daß die im Kristall allein vorliegende Form des Moleküls zentrosymmetrisch ist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990713
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  • 5
    Electronic Resource
    Electronic Resource
    Kondensierte Isochinoline, III Untersuchungen über die Reaktivität der s-Triazolo[3.4-a]isochinoline (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3925-3939 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Condensed Isoquinolines, III. Studies on the Reactivity of s-Triazolo[3.4-a]isoquinolinesHMO-Calculations of s-triazolo[3.4-a]isoquinoline (1) reveal a high doublebond character of the C-5/C-6 bond. Halogenaddition, catalytic hydrogenation and oxidation reactions are in experimental agreement. It appears from oxidation reactions of derivatives of 1 that unsaturated side chains are also oxidatively degradated at the same time under the same conditions.
    Notes: Aus HMO-Berechnungen des s-Triazolo[3.4-a]isochinolins (1) geht u. a. ein hoher Doppelbindungscharakter der C-5/C-6-Bindung hervor, was auch experimentell bei Halogenaddition, katalytischer Hydrierung und Permanganat-Oxydation beobachtet wird. Oxydationsreaktionen der Derivate von 1 zeigen, daß ungesättigte Seitenketten unter gleichen Bedingungen gleichzeitig oxydativ abgebaut werden.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711041222
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  • 6
    Electronic Resource
    Electronic Resource
    Azolylborane adducts. Structural and conformational analysis by x-ray diffraction and NMR. Protic-hydric (C=Hδ+-δ-H=B) and Protic-Fluoride (C=Hδ+-δ-F=B) interactions (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 441-449 
    Details
    ISSN: 0009-2940
    Keywords: Azolylborane adducts ; Boron-imidazole adducts ; Boron-pyridine adducts ; Protic-hydric interactions ; Protic-fluoride interactions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation, NMR and X-ray diffraction studies of a series of azolylboron hydrides derived from pyrrole, indole, and carbazole coordinated with tetrahydrofuran, pyridine, and imidazole are reported. The azolyl substituents are very electroattractive leading to an acidic boron atom which strongly coordinates with the Lewis bases. The stabilization of the =BH2=groups against disproportionation could be explained in terms of the interactions found between the acidic hydrogen atoms of the heterocycles (C=Hδ+ acceptor) and the hydrides (B=Hδ- donors).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290413
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  • 7
    Electronic Resource
    Electronic Resource
    Polygold(1-adamantyl)ammonium Salts (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 221-223 
    Details
    ISSN: 0009-2940
    Keywords: Gold ; Polygoldammonium salts ; (1-Adamantyl)ammonium salts ; Trinuclear complex, X-ray structure of ; Tetranuclear complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of 1-adamantylamine with tris(triphenylphosphaneaurio)oxonium tetrafluoroborate results in the formation of the trinuclear adamantyltris(triphenylphosphaneaurio)ammonium tetrafluoroborate {C10H15[Au(PPh3)]3}+BF4-. The product can be further aurated by addition of equimolar amounts of triphenylphosphanegold(I) tetrafluoroborate to give the tetranuclear complex {C10H15N[Au(PPh3)]4}2+(BF4minus;)2. Both compounds have been fully characterized by analytical and spectroscopic data, and in the case of the trinuclear complex by a single crystal X-ray structure determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300213
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis and Photophysical Properties of New 2,2′-Bipyridine-Bridged Bis[ruthenium(II)tris-2,2′-bipyridine] Complexes (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 529-534 
    Details
    ISSN: 0009-2940
    Keywords: Ruthenium ; 2,2′-Bipyridines ; Redox chemistry ; Fluorescence spectroscopy ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have synthesized a new type of tris-2,2'-bipyridine ligand with 4,4'- and 6,6'-disubstituted 2,2'-bipyridine (bpy) units. The terminal 4,4'-and 6,6'-disubstituted 2,2'-bipyridine moieties are selectively coordinated by Ru(bpy)2 (bpy = 2,2′-bipyridine), whereas the central 2,2′-bipyridine ligand does not participate in any metal ion coordination. The two Ru(bpy)3 units of 7 and 8 do not interact appreciably, as is evident from their electrochemical and photophysical data. The lifetime of the excited state of compound 7 at 77 K is similar to that of Ru(bpy)2(4,4′-dimethyl-2,2′-bipyridine), whereas that of compound 8 under the same conditions is comparatively long.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300413
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  • 9
    Electronic Resource
    Electronic Resource
    Polynuclear Gold(I) Complexes of Functionalized Thiols and Dithiols (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 641-646 
    Details
    ISSN: 0009-2940
    Keywords: Gold ; S ligands ; Carboxylato complexes ; Thioether complexes ; Sulfonium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Treatment of 2-mercaptoaniline with {[(Ph3P)Au]3O}+ BF-4 leads to a regioselective auration to give the (2-aminophenyl)sulfonium complex {(2-H2NC6H4S[Au(PPh3)]2}+ BF-4 (1) as the sole product. With the same reagent, 4-hydroxyphenyl)sulfonium salt 2, and 2-mercaptopyridine is converted into the 2-pyridylsulfonium salt 3. Dinuclear auration of the thiol functions is thus clearly favoured over the reaction at any of the other functional groups (-NH2, -py, -OH). As shown in earlier work, this is also true for HS-functional carboxylic acids. With an excess of the oxonium reagent, however, 2-mercaptosuccinic acid was now found to be converted into a tetranuclear complex with a doubly aurated sulfonium group and monoaurated carboxylate functions (4). Bis(2-mercaptoethyl) ether and thioether react with the oxonium salt to give tetranuclear bis(sulfonium salts) 5, 6, with bifurcated {-S[Au(PPh3)]2}+ groups at both ends. Structural studies of compounds 1, 5 and 6 showed the cations to be aggregated into centrosymmetrical dimers through short Au-Au contacts. Compound 5 forms one-dimensional infinite chains through a similar aggregation via the two bifurcated sulfonium end groups of each individual dicationic unit. The dications of compound 6 are associated only into centrosymmetrical dimers leaving one of the two sulfonium groups of each unit without auriophilic contacts to neighbouring dications, probably owing to an internal Au-S contact with the thioether function.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300515
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  • 10
    Electronic Resource
    Electronic Resource
    Coordination Compounds of Coinage Metals with Vinylidenebis(diphenyl-phosphane) and Its Disulfide and Their Reactivity towards NucleophilesDedicated to Professor P. Royo on the occasion of his 60th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1513-1517 
    Details
    ISSN: 0009-2940
    Keywords: Gold ; Silver ; Diphosphane ; Diphosphane Disulfide ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vinylidenebis(diphenylphosphane) reacts with gold(I) or gold(III) compounds to give dinuclear {[{Au(C6F5)]2[(PPh2)2C=CH2{] or [Au{PPh2C(=CH2)Ph2P)]2(ClO4)2] or mononuclear complexes ([Au(C6F5)3(PPh2C(=CH2)Ph2P)]}, respectively. The latter reacts with gold(I) or silver(I) compounds to afford dinuclear [[Au(C6F5)3[PPh2C(=CH2)Ph2P}AuX], X=Cl or C6F5) or trinuclear species {[{Au(C6F5)3{PPh2C(=CH2)Ph2P{]2M]ClO4, M=Au or Ag}. No addition of nucleophiles to the C=C double bond is observed in these complexes, which contain the diphosphane acting as bridging or monodentate ligand. (SPPh2)2C=CH2 reacts with AgClO4 to give [Ag{SPPh2C(=CH2)Ph2PS}]2-(ClO4)2or[Ag[PPh2C(=CH2)Ph2P]2]ClO4. The crystal structure of [Au(C6F5)3{PPh2C(=CH2)Ph2P}Au(C6F5)] has been established by X-ray crystallography, and confirms the expected square planar and linear geometry for the Au111 and Au1 centres, respectively.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971301026
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