The Condensation of Salicylaldehydes and Malononitrile Revisited: Synthesis of New Dimeric Chromene Derivatives
✍ Scribed by Costa, Marta; Areias, Filipe; Abrunhosa, Luís; Venâncio, Armando; Proença, Fernanda
- Book ID
- 115535444
- Publisher
- American Chemical Society
- Year
- 2008
- Tongue
- English
- Weight
- 216 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0022-3263
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📜 SIMILAR VOLUMES
## Abstract A versatile and efficient single‐step route to 3‐cyanocoumarins __via__ Knoevenagel condensation of salicylaldehydes and malononitrile using ZrCl~4~ as the catalyst (15 mol %) in ionic liquid 1‐(__n__‐butyl)‐3‐methylimidazolium tetrafluoroborate as reaction medium and catalyst is descri
## Abstract On heating of the cyanoacetic acid cyclopentylidene hydrazide **1** with salicylaldehyde in the presence of bases the azaanthracene derivative **6** was formed. Also, reaction of **3** with malononitrile and ketones **10a,b** afforded the pyrano[3,4‐__c__]chromene **9** and chromeno[3,4