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  • 1
    Electronic Resource
    Electronic Resource
    Mechanically Induced Second Harmonic Generation in SC Elastomers (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 1854-1858 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00110a020
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  • 2
    Electronic Resource
    Electronic Resource
    Tetracyclo[5.1.0.01,6.02,7]octane, a [1.1.1]propellane derivative, and a new route to the parent hydrocarbon (1985)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 107 (1985), S. 6410-6411 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00308a053
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesen substituierter [1.1.1]Propellane (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1509-1529 
    Details
    ISSN: 0009-2940
    Keywords: [1.1.1]Propellanes ; Cyclopropanation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of [1.1.1]PropellanesTwo routes to [1.1.1]propellanes are presented: the “classical” cyclopropanation of bicyclo[1.1.0]butane derivatives and the carbenoid cyclization of 1-lithio-1-halo-3-alkylidenecyclobutanes, whose four-membered ring is part of a bicyclo[3.1.1]heptane or of a bicyclo[2.1.1]hexane system. The X-ray structures of two [1.1.1]propellanes, 61 and 45, have been determined.
    Notes: In der „klassischen“ Cyclopropanierung von Bicyclo[1.1.0]butan-Derivaten und in der Carbenoid-Cyclisierung von 1-Lithio-1-halo-3-alkylidencyclobutanen, bei denen der Vierring Teil eines Bicyclo[3.1.1]heptan- oder Bicyclo[2.1.1]hexan-Systems ist, wurden zwei effiziente Wege zu [1.1.1]Propellanen gefunden. Von zwei Modellen, 61 und 45, wurden die Röntgenstrukturen ermittelt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220824
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  • 4
    Electronic Resource
    Electronic Resource
    Concerning the Synthesis of [1.1.1]Propellane (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 397-398 
    Details
    ISSN: 0009-2940
    Keywords: Cyclopropa annulation ; [1.1.1]Propellane ; Polycycles, strained ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of 1,1-dibromo-2,2-bis(chloromethyl)cyclopropane (2) with methyllithium in ether led to a solution of [1.1.1]-propellane (1) in a yield of 70%. 1 could also be prepared free of solvent by reaction of 2 with lithium powder in triglyme/n-decane at 73°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220233
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  • 5
    Electronic Resource
    Electronic Resource
    Second harmonic generation on mechanically oriented SC*-elastomers (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 15 (1994), S. 295-302 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1994.030150401
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanical field orientation of chiral smectic C polymer networks (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 196 (1995), S. 3197-3208 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Deformation experiments on chiral smectic C elastomers show a significant influence of the layer structure. In contrast to nematic systems a deformation of the smectic polydomain does not lead to a uniform director orientation. Obviously, the smectic layers lock in the polydomain structure in a transient network. Therefore, on experimental time scale, no equilibrium conditions can be achieved during the deformation process in the smectic state. Reducing the influence of the smectic layers by swelling the sample with toluene offers the possibility to prepare samples with uniform director orientation. In these samples the smectic layers are distributed on a cone around the director, preventing ferroelectric properties. Further deformation experiments on these aligned samples show a strong interaction of the layer orientation with the mechanical field in the smectic state. Layers which enclose large angles with the mechanical field realign to layer orientations with small angles to the deformation direction. This orientation behaviour leads to an anisotropic distribution of the layer on the cone causing a non-centrosymmetric phase structure. This anisotropic alignment can be locked in by chemical crosslinking, leading to a highly transparent non-centrosymmetric bulk material.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1995.021961010
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  • 7
    Electronic Resource
    Electronic Resource
    Orientation of a chiral smectic C elastomer by mechanical fields (1994)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 5 (1994), S. 231-235 
    Details
    ISSN: 1042-7147
    Keywords: Chiral smectic C elastomer ; Orientation ; Mechanical fields ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: It is well known that, with respect to the director, nematic elastomers can be macroscopically aligned by uniaxial mechanical fields. Extending this method to a chiral smectic C elastomer, depending on the experimental set-up either smectic layer orientation or director orientation parallel to the stress axis occurs. In order to align the director and the smectic layers a biaxial mechanical field (e.g. shear field) consistent with the phase symmetry has to be used to achieve a macroscopically uniform orientation of the untwisted smectic C* structure.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1994.220050405
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