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  • 1990-1994  (2)
  • Analytical Chemistry and Spectroscopy  (2)
  • 1
    Electronic Resource
    Electronic Resource
    A versatile approach to the reproducible synthesis of functionalized polysiloxane stationary phases (1992)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 15 (1992), S. 444-448 
    Details
    ISSN: 0935-6304
    Keywords: Block polysiloxanes ; Block condensation ; Chiral polysiloxanes ; Functionalized polysiloxanes ; Polycondensation ; Polysiloxane stationary phase ; Reactive polysiloxanes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Exploitation of the full potential of selector-modified polysiloxanes as chromatographic stationary phases is limited because conventional methods of silicone synthesis involve strong acids or strong nucleophiles such as water or bases; under these conditions many potentially useful selectors decompose. The general approach to polysiloxane synthesis presented herein gives access to functionalized polysiloxanes under mild conditions. The functional groups incorporated can serve as chromatographic selectors or as electrophilic sites for secondary modification or cross-linking.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240150708
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A method for reproducible preparation of chiral polysiloxanes with regular repeat units as stationary phases for capillary gas chromatographyDedicated to Professor William H. Pirkle on the occasion of his 60th birthday. (1994)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 17 (1994), S. 9-14 
    Details
    ISSN: 0935-6304
    Keywords: Block polysiloxanes ; Functionalized polysiloxanes ; Chiral polysiloxanes ; Enantioselective stationary GC phase ; Polysiloxane synthesis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trifluoroethyl ester-functionalized polysiloxanes can be prepared by block condensation of 3-dichloromethylsilyl-2-methylpropionic acid 2′,2′,2′-trifluoroethyl ester with 1,5-bis(diethylamino)hexamethyltrisiloxane or with disodium tetramethyldisiloxane-1,3-diolate. The functionalized polysiloxanes may serve as supports for a variety of selector groups; for instance, nucleophilic displacements with L-valine-t-butylamide or L-α-naphthylethylamine lead to chiral polysiloxanes in high yields and with high reproducibility. Imidazole accelerates the rate of nucleophilic displacement. Capillary columns coated with such chiral polysiloxanes exhibit high enantioselectivity and thermostability.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240170103
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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