13C NMR studies of heterocyclic naphtho- and anthraquinones. Deshielding effect on the carbonyl carbon with methyl substitution

Magn Reson Chem. 2008 Feb;46(2):191-4. doi: 10.1002/mrc.2156.

Abstract

13C chemical shift assignment of several methyl substituted heterocyclic naphtho- and anthraquinones, including dihydronaphthofuranquinones, azaanthraquinones, benzopyrroloquinolinediones and benzothiophenoquinolinediones, are described. A deshielding effect due to a methyl group was observed over the neighbouring carbonyl carbon, in every case studied. 13C assignments were based on 2D experiments.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anthraquinones / chemical synthesis
  • Anthraquinones / chemistry*
  • Carbon / chemistry*
  • Carbon Isotopes
  • Magnetic Resonance Spectroscopy*
  • Naphthoquinones / chemical synthesis
  • Naphthoquinones / chemistry*

Substances

  • Anthraquinones
  • Carbon Isotopes
  • Naphthoquinones
  • Carbon