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Carbon-13 NMR spectra of rifamycins
Authors:E. Martinelli  R.J. White  G.G. Gallo  P.J. Beynon
Affiliation:Laboratori Ricerche Lepetit S.p.A., 20158 Milano, Italy;Jeol Ltd., London NW9, England
Abstract:The natural abundance 13C Fourier transform magnetic resonance spectra of rifamycin S and some of its derivatives have been studied. A combination of five different approaches has made unambiguous assignments for most of the resonances possible: (1) comparative study of the non- decoupled and noise-decoupled spectra; (2) 13C spectral characteristics; (3) spectral comparison between derivatives; (4) selective proton decoupling; (5) biogenetic evidence. Pulse and Fourier transform 13C NMR spectroscopy provides a more complete picture of these complex molecules than was previously obtained by 1H NMR spectroscopy.
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