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  • hydrophobicity  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Improvement in hydrophobicity of Ti-MCM-41 using a new silylation agent MSTFA (2000)
    Springer
    Catalysis letters 65 (2000), S. 141-145 
    Details
    ISSN: 1572-879X
    Keywords: silylation ; MSTFA ; hydrophobicity ; Ti-MCM-41 ; epoxidation ; cyclohexene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new silylation agent, N-methyl-N-(trimethylsilyl) trifluoroacetamide (MSTFA), has been employed for the trimethylsilylation of Ti-MCM-41. The FT-IR spectra revealed that the hydrophobic trimethylsilyl group, –Si(CH3)3, in MSTFA can replace the hydrogen in the silanol at room temperature. By virtue of their high volatility, MSTFA and its derivative, N-methyl trifluoroacetamide, can be readily removed after silylation. The MSTFA silylated Ti-MCM-41 is found to be more hydrophobic than that silylated by BSTFA and to bring about a significant enhancement in the yield of epoxide from cyclohexene epoxidation with aqueous H2O2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019096617082
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  • 2
    Electronic Resource
    Electronic Resource
    Silylation of Ti‐MCM‐41 by trimethylsilyl‐imidazole and its effect on the olefin epoxidation with aqueous H2O2 (2000)
    Springer
    Catalysis letters 66 (2000), S. 245-249 
    Details
    ISSN: 1572-879X
    Keywords: silylation ; trimethylsilyl‐imidazole ; hydrophobicity ; Ti‐MCM‐41 ; cyclohexene epoxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ti‐MCM‐41 catalyst was silylated with a new silylating agent, N‐trimethylsilyl‐imidazole (TMSI). TMSI was found to be more effective to improve the hydrophobicity and the catalytic performance of Ti‐MCM‐41 than other silylating agents. Different levels of silylation were obtained by varying the silylation time. A linear relationship was observed between the degree of silylation and each of the intensity ratios I1260/I1083,I845/I1083 and I760/I1083 of SiMe3 spectra bands detected by FT‐IR or the intensity ratio SiMe3/SiO2 of the 29Si‐MAS‐NMR signals. High level of silylation degree significantly enhances both the catalytic activity and the selectivity to epoxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019072228411
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    Paper (German National Licenses)
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