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0742313860
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note
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4. Solvents were removed, and the crude product was purified by column chromatography on silica gel.
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28
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0037782644
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It has been reported that 9-BBNOTf could catalyze the aldol-type reaction between silyl enol ether and acetals. Ishihara, K.; Yamamoto, H.; Heathcock, C. H. Tetrahedron Lett. 1989, 30, 1825-1828.
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0742313858
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note
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4. The crude product was purified by chromatography on silica gel column.
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31
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0742296272
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note
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Enolization was carried out at -78°C for 2 h before the acetal or ketal was added.
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33
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