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The relative configuration of acyclic alpha-alkyl-beta-hydroxy carbonyl compounds can be determined by using (1)H NMR spectroscopy. The assignment can be achieved by recording the (1)H NMR spectrum of the syn-anti mixture. The upfield carbinol hydrogen signal belongs to the anti whereas the downfield to the syn stereoisomer.
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Kalaitzakis et al. (2008) studied this question.
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