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Cellulose sulphuric acid as a biodegradable and reusable catalyst for the Knoevenagel condensation

100%
Shelke K., Sapkal S., Niralwad K., Shingate B., Shingare M.
Open Chemistry
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2010
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vol. 8
|
issue 1
12-18
EN
A green, mild and efficient method for Knoevenagel condensation of 3-formylchromone/2-chlroquinoline-3-carbaldehyde with active methylene compounds such as Meldrum’s acid/ethyl cyanoacetate using biosupported cellulose sulphuric acid (CSA) in the solid-state by grinding under solvent-free condition has been developed. This method provides several advantages including environmental friendliness, shor t reaction times, high yields and a simple work-up procedure. Moreover, the CSA was successfully reused for four cycles without significant loss of activity. [...]
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LiOH.H2O as a catalyst for Knoevenagel and Gewald reactions

86%
Gouda M.
Polish Journal of Chemical Technology
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2010
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vol. 12
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issue 4
31-35
EN
Commercial available lithium hydroxide monohydrate LiOH.H2O was found to be a novel ‘dual activation’ catalyst for tandem cross Knoevenagel condensation between malononitrile or ethylcyanoacetate and aromatic aldehydes leading to an efficient and easy synthesis of the corresponding arylidenes at room temperature in a short reaction time. In the case of salicyaldehyde the reaction lead to the formation of 3-substituted coumarins. The high efficacy, cheapness and easy availability of LiOH.H2O prompted us to investigate its validity as a basic catalyst for Gewald reaction.
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