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Carbon-13 nuclear magnetic resonance studies of anthraquinones Part II—hydroxymethoxyanthraquinones, acetoxymethoxyanthraquinones and naturally occuring anthraquinone analogues

✍ Scribed by Y. Berger; A. Castonguay; P. Brassard

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
441 KB
Volume
14
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^13^C NMR spectra of hydroxymethoxyanthraquinones, acetoxymethoxyanthraquinones and naturally occuring anthraquinone derivatives are reported and all chemical shifts assigned. Hydroxy, methoxy and acetoxy substitution parameters are additive except in the case of 1,2‐disubstitution and for 1‐hydroxyanthraquinones substituted on C‐3 or on C‐4 by an hydroxy or a methoxy group. In anthraquinones substituted on C‐2, carbon shieldings are found to be sensitive to steric interference and to conjugative electron release by the 1‐OCH~3~.

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