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

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Shelke K., Sapkal S., Niralwad K., Shingate B., Shingare M.
Open Chemistry
|
2010
|
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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