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Trifluoroacetaldehyde SAMP-hydrazone is much more stable than trifluoroacetaldehyde imines. Therefore in contrast the hydrazone can be purified by flash column chromatography.
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0042205953
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2O (10/1) gave 3a in 79% yield.
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Details of X-ray structure analysis will be described in a full paper.
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36
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2O (5/1) as the eluent, affording 5a in 87% yield.
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47
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2, see: Fernández, R.; Ferrete, A.; Lassaletta, J. M.; Llera, J. M.; Monge, A. Angew. Chem. 2000, 112, 3015; Angew. Chem., Int. Ed. 2000, 39, 2893.
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