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The oxazolidine products are unstable under electron-impact ionization conditions and show very low-intensity or no M+ ions. For those compounds that didn't show M+ ions, high-resolution mass spectrometry (electron impact) were obtained on [M, H, see: J. Xu, G. Zuo, Rapid Commun. Mass Spectrom. 2003, 17, 1651 ;
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25
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84986459962
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26
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36749096641
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1H NMR analysis of the crude product. The lower yields obtained in some cases, e.g. 75% for lb (entry 2), were due to losses during chromatographic purification of the crude product. The purification was automated and not optimized for each product.
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1H NMR analysis of the crude product. The lower yields obtained in some cases, e.g. 75% for lb (entry 2), were due to losses during chromatographic purification of the crude product. The purification was automated and not optimized for each product.
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We thank a referee for pointing out a related example of α-alkylation of a ketone with ylide 4a [M. Rudus, I. Fejes, M. Nyerges, A. Szöllõzy, L. Tokë, P. Groundwater, J. Chem. Soc, Perkin Trans. 1 1999, 1167
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