Zeolites as base catalysts: Condensation of benzaldehyde derivatives with activated methylenic compounds on Germanium-substituted faujasite

The condensation of benzaldehyde, 2-nitrobenzaldehyde, and 2-trifluoromethylbenzaldehyde with ethyl cyanoacetate and ethyl malonate to obtain intermediates for the production of dihydropyridine derivatives has been carried out on NaX-type zeolites. The substitution of Si by Ge during the zeolite syn...

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Bibliographic Details
Published in:Journal of catalysis 1990-11, Vol.126 (1), p.192-198
Main Authors: Corma, A., Martín-Aranda, R.M., Sánchez, F.
Format: Article
Language:English
Subjects:
Catalysis
Catalytic reactions
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The condensation of benzaldehyde, 2-nitrobenzaldehyde, and 2-trifluoromethylbenzaldehyde with ethyl cyanoacetate and ethyl malonate to obtain intermediates for the production of dihydropyridine derivatives has been carried out on NaX-type zeolites. The substitution of Si by Ge during the zeolite synthesis results in a strong increase in activity, which has been related to changes in basicity. High activities and selectivities are obtained with the NaGeX zeolite when operating in a batch reactor at moderate temperatures. This zeolite is more active than pyridine and less active than piperidine.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(90)90057-Q