𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The carbon-13 nuclear magnetic resonance spectra of anthraquinone, eight polyhydroxyanthraquinones and eight polymethoxyanthraquinones

✍ Scribed by Y. Berger; A. Castonguay

Publisher
John Wiley and Sons
Year
1978
Tongue
English
Weight
271 KB
Volume
11
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The ^13^C NMR spectra of anthraquinone, eight hydroxyanthraquinones and eight methoxyanthraquinones are reported. Peak assignment for the carbon atoms of these compounds is achieved by using decoupling techniques and by intercomparison of the variously‐substituted derivatives. Carbonyl chemical shifts in the hydroxyanthraquinones can be rationalized in terms of cross conjugation and intramolecular hydrogen bonding and in terms of cross conjugation in the methoxyanthraquinones. Hydroxy and methoxy substituent chemical shifts are also reported.

📜 SIMILAR VOLUMES

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of isoflavones
✍ M. Sree Rama Murthy; E. Venkata Rao; R. S. Ward 📂 Article 📅 1986 🏛 John Wiley and Sons 🌐 English ⚖ 669 KB

The =C chemical shifts of a series of isoflavones having hydroxy, acetoxy, methoxy and methylenedioxy substituents are compared. Some general relationships between substitution patterns and chemical shifts, useful for the identitication of naturally occurring isoflavones, are outlined.

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of veratrine components
✍ Deanna de Marcano; Bernardo Méndez; Henry Parada; Aníbal Rojas 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 114 KB 👁 1 views

## Abstract The ^13^C NMR spectra were determined and signals assigned to the various carbons of veratridine and cevadine.

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of ceveratrum alkaloids
✍ Francis A. Carey; William C. Hutton; James C. Schmidt 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 402 KB

## Abstract The ^13^C NMR spectra were determined and signals assigned to the various carbons of the alkamines veracevine, germine and zygacine derived from steroidal alkaloids of the ceveratrum class. Assignment of signals was aided by analysis of the partially relaxed spectrum of cervagenine 9,12

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of D-homoandrostane derivatives
✍ Deanna Marcano; Anibal Rojas; Bernardo Méndez; Jeannette De Méndez 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 347 KB 👁 1 views

## Abstract The ^13^C chemical shift data of a series of ketone, alcohol and ester derivatives of D‐homoandrostane are reported. Homologation effects are discussed, as well as substituent effects on the homologated structures.

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of methyl 2-pyronecarboxylates
✍ Takeshi Imagawa; Akira Haneda; Mituyosi Kawanisi 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 393 KB

## Abstract The ^13^C NMR spectra of methyl 2‐pyrone‐3‐, 4‐, 5‐ and 6‐carboxylates were studied and the substituent effects on the 2‐pyrone ring were compared with those of some model compounds. ^1^H NMR spectra were also recorded and discussed. The long range ^13^C, ^1^H coupling constants were ob

Carbon-13 nuclear magnetic resonance spe
Carbon-13 nuclear magnetic resonance spectra of some aromatic diterpenoids
✍ Toshiaki Nishida; Inger Wahlberg; Curt R. Enzell 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 643 KB

## Abstract ^13^C n.m.r. studies of a series of tricarbocyclic ring C aromatic diterpenoids using proton‐noise and single‐frequency off‐resonance decoupling, partially relaxed Fourier transform techniques, shift reagents and specifically labelled derivatives have permitted unequivocal assignments o