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  • 1
    Electronic Resource
    Electronic Resource
    New technique in optical resolutions (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 6 (1994), S. 314-320 
    Details
    ISSN: 0899-0042
    Keywords: amphetamine ; distillation method ; clathrate ; optical activation of bases ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The present paper illustrates the development of an advanced technique in optical resolution. Both of the amphetamine enantiomers can be obtained by a two-step distillation in nearly quantitative yield without any loss of the resolving agent. It is proved that the second-order interactions (H-bond) are sufficient for separation of enantiomers by distillation. © 1994 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530060415
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Colour Polymorphism of a Bis(quinoxaline) Compound (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 2119-2125 
    Details
    ISSN: 1434-193X
    Keywords: Polymorphism ; Quinoxalines ; X-ray analysis ; Quantum chemical calculations ; Molecular mechanical calculations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of 2(1H)-quinoxalinone O-(2′-quinoxalinyl)oxime (3) results in two easily distinguishable crystal forms with different colours, providing a rare example of colour polymorphism. The crystal structures of the two forms have been determined and compared. Intermolecular interactions and light-absorption characteristics of the polymorphs have been analysed by a mixed quantum chemical/molecular mechanical method. In one of the polymorphic forms the crystal field stabilises relatively high energy conformations by enhanced electrostatic interactions. The difference in the light absorption is found to be caused partly by a conformational difference of the molecules. The crystal field increases the difference in the absorption wavelengths and shift them towards higher values.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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