期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 16, 期 26, 页码 7773-7780出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201000218
关键词
acylation; aluminum; ferrocene; mesoporous materials; silicon
资金
- Grant Agency of the Academy of Sciences of the Czech Republic [104/07/0383]
- Grant Agency of the Czech Republic [203/08/H032]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- World Premier International Research Center (WPI) Initiative on Materials Nanoarchitectonics (MEXT, Japan)
- Ministry of Education of the Czech Republic [MSM0021620857]
Ferrocene acylation with bulky acylating agents (1-adamantoyl, benzoyl, 2-chlorobenzoyl, and cinnamoyl chlorides; and benzoic anhydride) catalyzed by AlKIT-5 mesoporous catalysts was investigated. AlKIT-5 catalysts with varying ratios of Si/Al were synthesized using tetraethoxysilane and aluminum isopropoxide as the structural building blocks and Pluronic F127 as a template under acidic conditions and were characterized in detail by X-ray powder diffraction, magic-angle spinning (MAS) NMR spectroscopy, sorption of nitrogen, energy-dispersive Xray spectroscopy (EDS), SEM, TEM, and FTIR with pyridine as a probe molecule. The catalytic activity of the prepared AlKIT-5 catalysts in ferrocene acylation was shown to depend on the type of the acylating agent, thus likely reflecting the strength of interactions between the acyl source, the product, and the solid catalysts when the acylation reaction was carried out at 100 degrees C. In all reactions, the AlKIT-5 catalysts afforded exclusively the monoacylated products (100% selectivity) most likely due to deactivation of the second cyclopentadiene ring by attachment of the first acyl group, steric reasons, and some competitive interactions of the monoacylferrocenes with the catalysts. The prepared AlKIT-5 catalysts could be regenerated without any significant loss of the ferrocene conversion.
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