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The synthesis of (1′‐ 13 C)‐, (3‐ 13 C)‐ and (2,4‐ 13 C 2 )citric acid from simple starting compounds is described. Using the same procedure, any mono‐ or multiply‐labelled citric acid can be prepared. The 13 C‐labelled citric acids have been characterized by 1 H NMR, 13 C NMR and mass spectroscopy.
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Winkel et al. (1989) studied this question.
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