13C NMR spectra of some coumarins of Haplophyllum obtusifolium
✍ Scribed by A. D. Vdovin; É. Kh. Batirov; A. D. Matkarimov; M. R. Yagudaev; V. M. Malikov
- Book ID
- 104827497
- Publisher
- Springer
- Year
- 1987
- Tongue
- English
- Weight
- 208 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0009-3130
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📜 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) side‐chain at C‐3, are reported and compared with those of the C‐3 unsubstituted compounds. Unlike the linear isomers, no γ‐effect is observed in the corresponding angular derivatives; this is proposed as s