## A novel synthesis of coumarin derivatives EGDEEN, Ibrahim Mohey F d t y of E d w d o n , Suu Canal Uniuet&y, Port Said, EoVpt Ahtrrct ride, hydrogen chloride, ethyl magnaium bromide and it. .elf-coupling an reported. The chemial.behwiora of 3-ethynylcoumuin bwarda benryl bromide, diazonium &lo
Synthesis and study of 6-arylazo coumarin derivatives
β Scribed by R. Rajagopal; S. Seshadri
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 671 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0143-7208
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The direct synthesis of coumarin derivatives from m-substituted phenols and a&unsaturated carboxylic acids catalysed by solid-acid catalysts, such as zeolite H-Beta or Amberlyst-15, in toluene as solvent was studied. The conversion involves esterification followed by alkylation (ring closure). Ring
## Abstract magnified image A new series of 3βacylβ6,7,8βsubstituted coumarin derivatives has been synthesized in high yields (79β99%) and characterized by means of elemental analysis, mass spectrometry, IR, and ^1^H NMR spectroscopy. We examined with particular attention the presence of an acyl gr