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13 C NMR spectra of natural products. 1—guaianolides
Author(s) -
Da Silva Antonio J. R.,
Garcia Marcos,
Baker Paul M.,
Rabi Jaime A.
Publication year - 1981
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270160313
Subject(s) - lactone , chemistry , carbon 13 nmr , nmr spectra database , nuclear magnetic resonance spectroscopy , stereochemistry , spectral line , organic chemistry , physics , astronomy
The 13 C NMR spectra of 18 guaianolides have been measured and the chemical shifts assigned. The compounds investigated include the naturally occurring eremanthin (1), dehydrocostus lactone, eregoyazin, eregoyazidin and other semisynthetic lactones derived from 1. Qualitative analysis of the data suggests that the predominant conformation in almost all compounds so far studied is a distorted chair‐like form.