A fragmentation pattern characteristic of 3‐substituted furans, in which the 3‐substituent carries an oxygen function, is discussed. Examination of the spectra of some meliacins, as well as those of some synthetic model compounds, illustrates the diagnostic value of this particular fragmentation. In addition the spectrum of methyl limonilate (III, R = CH3) is discussed in some detail.
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W. H. Baarschers (1972) studied this question.
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