Quaternary organic tetraalkylammonium hydroxide grafted on MCM-41 is a strong Brønsted base catalyst, and represents a useful alternative to soluble bases in reactions such as Knoevenagel condensations, Michael additions and aldol condensations because of their high catalytic activity under mild conditions, and good stability.
I. Rodriguez, S. Iborra, A. Corma, F. Rey and J. L. Jordá, Chem. Commun., 1999, 593 DOI: 10.1039/A900384C
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