NMR studies of the electronic structure of coumarins
โ Scribed by G. S. Kupriyanova
- Book ID
- 110672102
- Publisher
- SP MAIK Nauka/Interperiodica
- Year
- 1997
- Tongue
- English
- Weight
- 474 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0022-4766
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๐ SIMILAR VOLUMES
13C NMR data for several simple coumarins are reported. The ysvn effect of a 5-methoxy substituent on the C-4 chemical shift was observed and measured. The effects of an 8-iodo substituent on the chemical shifts of the carbons of the coumarinic skeleton are discussed.
## Abstract ^13^C NMR data of nineteen coumarins, twelve of which bear a prenyl (isoprenoid) sideโchain at Cโ3, are reported and compared with those of the Cโ3 unsubstituted compounds. Unlike the linear isomers, no ฮณโeffect is observed in the corresponding angular derivatives; this is proposed as s
The 1H and 13C NMR spectra of various methylcoumarins and methylfuroeoumarins are reported. All signals were assigned and the influence on chemical shifts of methylation at various positions was determined.