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  • General Chemistry  (63)
  • Inorganic Chemistry  (54)
  • Organic Chemistry  (17)
  • 1
    Electronic Resource
    Electronic Resource
    Untersuchungen an Alkali-Aluminium-Silicaten. Über die Einwirkung von Alkalisulfid- und Alkalipolysulfidlösungen auf Permutite (1932)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 204 (1932), S. 232-246 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Alkali- und Erdalkalipermutite färben sich beim Zusammenbringen mit Alkalisulfid-bzw. Alkalipolysulfidlosungen blaugrün bis blau.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19322040304
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Über den Oxydgehalt des Aluminiums und Methoden zu seiner Bestimmung (1931)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 199 (1931), S. 48-56 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die sich bei der Bestimmung von Aluminiumoxyd im Aluminium nach den Methoden von G. Jander und F. L. Hahn ergebende Verschiedenheit wurde durch Prüfung der Chloriermethode von Hahn aufgeklärt. Es wurde gefunden, daß die hohen Aluminiumoxydwerte durch das kieselsäurehaltige Schiffchenmaterial verursacht werden, da Aluminium bei der Chloriertemperatur die Kieselsäure reduziert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19311990107
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  • 3
    Electronic Resource
    Electronic Resource
    Studien über fraktionierte Fällung. II. Topochemische Einflüsse, am Beispiel der Trennung von Mn und Zn mit Na2S (1925)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 150 (1925), S. 84-98 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Trennung von Zink und Mangan aus gemeinsamer Lösung durch fraktionierte Fällung mit Schwefelnatrium wird behindert durch die4 Neigung des Zinksulfids, Mangansulfid mechanisch einzuschließen. Es ist anzunehmen, daß sich die Zns-Moleküle entsprechend den Ausführungen in § 2 um gleichzeitig mit ihnen gebildete MnS-Molekülhäufchen in so dichter und wohl geordneter Schicht legen, daß sie den Zutritt von Zn aus der Lösung zu den MnS-Kernen hindern.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19251500110
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  • 4
    Electronic Resource
    Electronic Resource
    A Packing Model for Interpenetrated Diamondoid Structures - an Interpretation Based on the Constructive Interference of Supramolecular Networks (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 765-771 
    Details
    ISSN: 0947-6539
    Keywords: aromatic stacking ; crystal engineering ; diamondoid networks ; packing model ; supramolecular chemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ability to predict and subsequently control solid-state structure has been identified as a major challenge in the field of crystal engineering. Here we suggest the concept of constitutive models as a tool for understanding crystal packings and for designing new solid-state structures. Such models are intended to relate molecular interactions and their geometrical constraints with solid-state organization. These models will most likely be of greatest use for crystals consisting of supramolecular networks, that is, infinite assemblies of small molecules associating through strong, directional, and selective noncovalent interactions. The concept of the constitutive packing model is illustrated for interpenetrated diamondoid coordination networks based on crystalline adducts of 4,4′-biphenyldicarbonitrile with silver(I) salts. Observed structural deformations induced by counterions of varying size may be understood in terms of the interference of two supramolecular networks within this system: the diamondoid metal-ligand coordination network and face-to-face aromatic stacks of the organic ligand. The constitutive model developed here has been applied to other diamondoid coordination networks in the literature and is found to be general.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030517
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  • 5
    Electronic Resource
    Electronic Resource
    Dicyanopolyynes: A Homologuous Series of End-Capped Linear sp Carbon (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 1105-1112 
    Details
    ISSN: 0947-6539
    Keywords: ab initio calculations ; alkynes ; carbon allotropes ; electronic structure ; semiempirical calculations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis, isolation, spectroscopic characterization, and computational investigations of the rod-shaped dicyanopolyynes 1-6 (C2nN2, n = 4-9), which are model substances for the hypothetical one-dimensional carbon allotrope carbyne sp-C∞, are described. Based on the trends in the spectroscopic behavior of 1-6 with increasing chain length, the electronic as well as the NMR properties of carbyne are predicted. For the investigation of the synthetic potential of this compound class, a first selected series of regioselective derivatizations is presented with the synthesis of the [4+2] and [3+2] cycloadducts 7-12.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030718
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  • 6
    Electronic Resource
    Electronic Resource
    The C60 Core: A Versatile Tecton for Dendrimer Chemistry (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 561-567 
    Details
    ISSN: 0947-6539
    Keywords: conformation ; dendrimers ; fullerenes ; molecular dynamics ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis, complete characterization and molecular dynamics simulations of dendrimers 4-8 involving [60]fullerene as core tecton and first- to thirdgeneration benzyl-ether-based dendrons as branches is described. In dendrimer 7 a core branching multiplicity of 12, the highest known to date, is realized for the first time with a Th-symmetrical C60 core having an octahedral addition pattern. This unique structural type of core building block is only possible on the base of C60 and has no precedent in organic chemistry. NMR investigations as well as molecular modelling studies show that, owing to high core branching multiplicity, dendrimer 7 and to a minor extent the mixed adduct 8 already represent globular and densely packed macromolecules, although only first-generation dendrons are involved in their construction.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030411
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  • 7
    Electronic Resource
    Electronic Resource
    Addition Chemistry of Rod-Shaped 1,6-Dicyanohexatriyne: Regioselectivity Control by the Remote Cyano Function (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 2491-2500 
    Details
    ISSN: 1434-193X
    Keywords: Addition reactions ; Cycloadditions ; Dicyanohexatriyne ; Enediyne ; Regioselectivity ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The addition of different alcohols, amines, thioalcohols, ethers, cycloalkanes, tin hydride, alkenes or alkadienes to 1,6-dicyano-1,3,5-hexatriyne (1) leads, with a pronounced regioselectivity, to a series of substituted 1-ene-3,5-diynes. The addition of alcohols, amines and thiols proceeds preferentially in a syn mode leading to diastereomers with an E configuration. The reaction with free radicals, on the other hand, proceeds in an anti addition mode. The [4+2] and [2+2] cycloadditions performed with 1 yielded unsaturated six- and four-membered ring adducts, respectively. The cyclobutene derivatives resulting from [2+2] cycloadditions underwent spontanous electrocyclic ring-opening reactions with the formation of butadiene derivatives. Nucleophilic additions to form 1 lead exclusively to products where the donor atom is bound at C-1. All the reactions, except the formation of 19, showed an excellent regioselectivity with respect to the preferred addition to a terminal C≡C triple bond.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    The Addition Patterns of C60 Trisadducts Involving the Positional Relationships e and trans-n (n = 2-4): Isolation, Properties, and Determination of the Absolute Configuration of Tris(malonates) and Tris[bis(oxazolines)] (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 3027-3039 
    Details
    ISSN: 1434-193X
    Keywords: Chirality ; Circular dichroism ; Cycloadditions ; Fullerenes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of regioisomeric trisadducts of C60 (5-11, 14-18) having the positional relationships e and trans-n (n = 2-4) resulting from successive additions of malonates or bis(oxazolines) to [6,6]-double bonds of the fullerene framework has been isolated and characterized. The new adducts 8-11 and 15-17 represent examples of unprecedented addition patterns. The addition patterns of the new trisadducts with C2, Cs or C1 symmetry have been assigned on the basis of the known positional relationships of the addends in their precursor bisadducts, and those of the C2- or Cs-symmetric representatives have been verified by analysis of their NMR spectra. The absolute configurations of the adducts with inherently chiral addition patterns could be determined either by comparison of the calculated and experimental CD spectra of the bis(oxazoline) adducts or with knowledge of the absolute configurations of the chiral bisadduct precursors containing bis(oxazoline) addends. The CD spectra of the pairs of diastereomers with an enantiomeric addition pattern fA -15/fC -15, fA -16/fC -16, and fA -18/fC -18 show mirror image behavior and pronounced Cotton effects.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and Characterisation of New Arsonium Salts and Crystal Structures of Trimethylarsonium Undecafluorodiarsenate (CH3)3AsH+As2F11- and Trimethylarsonium Hexafluoroantimonate (CH3)3AsH+SbF6- (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 2249-2254 
    Details
    ISSN: 1434-1948
    Keywords: Arsonium salts ; Superacidic systems ; Structure elicidation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of trimethylarsane in the superacidic systems hydrogen/fluoride antimony pentafluoride and hydrogen fluoride/arsenic pentafluoride leads to trimethylarsonium fluorometallates. These salts are stable up to 60 °C and 5 °C, respectively. Structures were successfully elucidated in the cases of trimethylarsonium undecafluorodiarsenate and trimethylarsonium hexafluoroantimonate. (CH3)3AsH+As2F11- crystallizes in the monoclinic space group P21/n with four formula units per unit cell with the dimensions a = 7.362(1), b = 12.589(1), c = 13.598(1) Å and β = 95.37(1)°. (CH3)3AsH+SbF6- crystallizes in the monoclinic space group P21/m with four formula units per unit cell with the dimensions a = 8.313(1), b = 8.855(1), c = 13.285(1) Å and β = 94.358(1)°.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 10
    Electronic Resource
    Electronic Resource
    Dendritic Mixed Hexakisadducts of C60 with a Th Symmetrical Addition Pattern (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 171-180 
    Details
    ISSN: 1434-193X
    Keywords: Dendrimers ; Fullerenes ; Macromolecular chemistry ; Template synthesis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The synthesis and complete characterization of dendritic hexakisadducts 8-13 of C60 with a mixed (1:5, 2:4, 3:3 and 4:2) Th symmetrical addition pattern is described. Pentakis-, tetrakis-, tris- and bisadducts 4-7 of C60 with diethyl malonate addends arranged in an incomplete octahedral addition pattern served as core building blocks. Completion of the pseudo-octahedral architecture was achieved by exhaustive cyclopropanation with first- to third-generation bromomalonate dendra 1-3 consisting of the corresponding Fréchet-type 3,5-dihydroxybenzyl alcohol subunits. This concept allows for the convergent synthesis of globular dendrimers with a variable number of dendritic malonates (1-4) and a high dendron density in good yields. The 1H and 13C NMR spectra reflect the Th symmetrical addition pattern of the products and reveal spatial interactions of inner dendron branches.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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