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13C NMR of coumarins. III—Simple coumarins

✍ Scribed by F. A. Macias; G. M. Massanet; F. Rodríguez-Luis; J. Salvá

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
236 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

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.

📜 SIMILAR VOLUMES

13C NMR of coumarins. V—3-prenylated cou
13C NMR of coumarins. V—3-prenylated coumarins
✍ F. A. Macias; R. Hernández-Galán; G. M. Massanet; F. Rodriguezluis; M. Vasquez; 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 386 KB

## 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

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## Abstract ^13^C NMR data for several linear furanocoumarins are reported. The β, γ~syn~ and δ effects of a 5‐oxygenated function on the coumarinic skeleton were measured. A spectroscopic criterion for distinguishing between C‐5 and C‐8 oxygenated, between C‐5 oxygenated, C‐8 alkylated and C‐5 alk

A novel assignment method in the 13C NMR
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## Abstract The signal shifts caused by replacing the carbonyl oxygen by sulphur represent a valuable method of assignment of the ^13^C NMR signals in coumarins and furocoumarins substituted at the benzoic and furanoic rings.