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  • 1
    Electronic Resource
    Electronic Resource
    Polymerization Reactions in an Al(OBus)3-(COOH)2 System (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 95-99 
    Details
    ISSN: 1573-4846
    Keywords: aluminum sec-butoxide ; oxalic acid ; 13C NMR spectroscopy ; 27Al NMR spectroscopy ; polymerization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reactions in an Al(OBus)3-(COOH)2 (OA)-tetrahydrofuran (THF)/(CD3)2SO (DMSO-d6) system (Al(OBus)3: THF : DMSO-d6: OA = 1 : 5 : 5 : x, x = 0.01 –3) were studied, without the addition of water and the process was monitored by NMR. When x ≤ 0.3, homogeneous solutions were obtained, whereas white precipitates formed with x ≥ 0.7. The formation of sec-butyl alcohol was evident with x ≥ 0.6, indicating that oxalate groups coordinate to aluminum to release sec-butyl alcohol. 13C NMR spectra of the solutions after 1 day suggest the presence of polymeric species if 0.03 ≤ x ≤ 0.6. The addition of a small amount of water resulted in the formation of a white precipitate (Al(OBus)3: THF : DMSO-d6 : OA : H2O = 1 : 5 : 5 : 0.3 : y,y = 0.03–0.3), indicating that water, possibly formed by esterification in the Al(OBus)3-OA-THF/DMSO-d6 system, does not take a major role in the present system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026415608082
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polymerization reactions in an Al(OBu s )3−(COOH)2 system (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 95-99 
    Details
    ISSN: 1573-4846
    Keywords: aluminum sec-butoxide ; oxalic acid ; 13C NMR spectroscopy ; 27Al NMR spectroscopy ; polymerization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reactions in an Al(OBu s )3−(COOH)2 (OA)-tetrahydrofuran (THF)/(CD3)2SO (DMSO-d6) system (Al(OBu s )3∶THF∶DMSO-d6∶OA=1∶5∶5∶x, x=0.01–3) were studied, without the addition of water and the process was monitored by NMR. Whenx≤0.3, homogeneous solutions were obtained, whereas white precipitates formed withx≥0.7. The formation of sec-butyl alcohol was evident withx≥0.6, indicating that oxalate groups coordinate to aluminum to release sec-butyl alcohol.13C NMR spectra of the solutions after 1 day suggest the presence of polymeric species if 0.03≤x≤0.6. The addition of a small amount of water resulted in the formation of a white precipitate (Al(OBu s )3∶THF∶DMSO-d6∶OA∶H2O=1∶5∶5∶0.3∶y, y=0.03–0.3), indicating that water, possibly formed by esterification in the Al(OBu s )3-OA-THF/DMSO-d6 system, does not take a major role in the present system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436824
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Esterification of the Silanol Groups in the Mesoporous Silica Derived from Kanemite (1998)
    Springer
    Journal of porous materials 5 (1998), S. 127-132 
    Details
    ISSN: 1573-4854
    Keywords: mesoporous silica ; esterification ; pore size ; hydrophobicity ; silanol group
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Silanol groups in the mesoporous silica derived from a layered silicate, kanemite (NaHSi12O5 ċ3H2O), were esterified with alcohols (CnH2n+1OH n=2 , 4, and 8). Most of the silanol groups in the mesopores were modified with ethanol though some silanol groups remained after the reactions with 1-butanol and 1-octanol. With the increase in the alkyl chain lengths of the alcohols, the pore sizes of the esterified products decreased and the hydrophobicity increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009641304742
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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