Abstract
Silica-bonded N-propyltriethylenetetramine was prepared via the reaction between 3-silicapropyl chloride and triethylenetetramine. This heterogeneous solid base was used as a catalyst for the synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) by a one-pot condensation of aromatic aldehydes with 3-methyl-1-phenyl-5-pyrazolone in 72–93 % yields. The catalyst could be recycled several times without any additional treatment.
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Acknowledgments
We are thankful to the Persian Gulf University Research Council for the partial support of this work. Also, we are thankful to the School of Chemistry, Manchester University for running NMR, BET, CHN, TGA, and SEM.
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Niknam, K., Habibabad, M.S., Deris, A. et al. Preparation of silica-bonded N-propyltriethylenetetramine as a recyclable solid base catalyst for the synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) . Monatsh Chem 144, 987–992 (2013). https://doi.org/10.1007/s00706-012-0910-6
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DOI: https://doi.org/10.1007/s00706-012-0910-6