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Carbon 13 nmr spectral differences between corresponding methyl esters phenyl esters and 2 substituted chromones



Carbon 13 nmr spectral differences between corresponding methyl esters phenyl esters and 2 substituted chromones



Helvetica Chimica Acta 64(8): 2654-2664



The 13C-NMR spectra of 2-substituted chromones (3) are compared with the data of the analogous methyl and phenyl esters (1 and 2) [antibiotic constituents]. The chemical shift differences found are most prominent for the C-atoms in .beta.-position to the ester carbonyl and chromone C(2), respectively. These shift differences are discussed in terms of conformational differences between the esters 1 and 2 and the analogous chromones 3.

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