✦ LIBER ✦

13C NMR of coumarins. IV—Furanocoumarins

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

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 304 KB
Volume: 28
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260280305

No coin nor oath required. For personal study only.

✦ Synopsis

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 alkylated, C‐8 oxygenated linear furanocoumarins and between C‐5 oxygenated linear or angular furanocoumarins is proposed.

📜 SIMILAR VOLUMES

13C NMR of coumarins. III—Simple coumari

13C NMR of coumarins. III—Simple coumarins

✍ F. A. Macias; G. M. Massanet; F. Rodríguez-Luis; J. Salvá 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 236 KB

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.

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

13C NMR spectral study of polyacetoxyxan

13C NMR spectral study of polyacetoxyxanthones. IV—13C NMR spectroscopy of substituted xanthones

✍ R. K. Chaudhuri; A. W. Frahm 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 197 KB

## Abstract The ^13^C NMR chemical shifts of nine acetoxyxanthones are reported and identified. The acetoxy substituent effects have been evaluated and the corresponding shift increments proposed.

13C NMR of coumarins I: 3-(1,1-Dimethyla

13C NMR of coumarins I: 3-(1,1-Dimethylallyl) derivatives

✍ F. A. Macís; G. M. Massanet; F. Rodriguez-Luis; J. Salvá 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 273 KB

13C NMR spectroscopy of natural substanc

13C NMR spectroscopy of natural substances: IV—13C NMR studies of trachylobane diterpenes: Complete carbon assignment

✍ A. Arnone; R. Mondelli; J. St Pyrek 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 322 KB

## Abstract The diterpene trachylobane and a series of derivatives have been completely analysed by FT ^13^C NMR spectroscopy. All ^13^C frequencies for trachylobanol have been unambiguously assigned by experimental techniques, i.e. by proton single‐frequency selective decoupling and shift reagent

NMR-Untersuchungen an Piperidinen—IV.13C

NMR-Untersuchungen an Piperidinen—IV.13C-NMR-Messungen an stereoisomeren Dimethylpiperidinen

✍ Detlef Wendisch; Herbert Feltkamp; Mitarbeit von Ueli Scheidegger 📂 Article 📅 1973 🏛 John Wiley and Sons 🌐 English ⚖ 262 KB 👁 1 views

## Abstract Es wird über die ^13^C‐Spektren der 12 isomeren Dimethylpiperidine berichtet. Die chemischen Verschiebungen der verschiedenen ^13^C‐Kerne werden diskutiert, speziell in Hinblick auf konfigurative und konformative Effekte.Auszugsweise vorgetragen auf dem ‘Colloquium Spectroscopicum Inter