Elsevier

Tetrahedron

Volume 35, Issue 17, 1979, Pages 2035-2038
Tetrahedron

13 C NMR spectroscopy of substituted xanthones—II: 13C NMR spectral study of polyhydroxy xanthones

https://doi.org/10.1016/S0040-4020(01)88974-2Get rights and content

Abstract

The 13C NMR chemical shifts of eleven hydroxy-, two hydroxymethoxy xanthones, and xanthone-C-glucoside, mangiferin, are presented and analyzed. Hydroxy substituent effects depending on substituent position as well as on shielded ring carbon position have been evaluated. Hydroxy substituent increments for xanthones are proposed. Effects of hydroxylation on carbonyl carbon shift and the methylation of hydroxy group and the corresponding shift increments which are of diagnostic value have been observed and discussed.

References (20)

  • R.K. Chaudhuri et al.

    Tetrahedron

    (1978)
  • I. Carpenter et al.

    Phytochemistry

    (1969)
    K. Hostettmann et al.

    Phytochemistry

    (1977)
    S. Ghosal et al.

    Phytochemistry

    (1975)
  • M.Sum b. Hj. Idris et al.

    J. Chem. Soc., Perkin I

    (1977)
  • K. Hostettmann et al.

    Helv. Chim. Acta

    (1976)
  • E. Wenkert et al.

    J. Am. Chem. Soc.

    (1969)
  • K. Hostettmann et al.

    Helv. Chim. Acta

    (1976)
  • S. Ghosal et al.

    J. Pharm. Sci

    (1973)
  • B.G. Österdahl

    Acta Chem. Scand. B

    (1978)
  • P. Westerman et al.

    Organic Magnetic Resonance

    (1977)
  • E.G. Sundholm

    Acta Chim. Scan. B

    (1978)
There are more references available in the full text version of this article.

Cited by (0)

View full text