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70349471875
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note
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For the proof of the stereochemsitry of 4a and 6a, see the Supporting Information.
-
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54
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70349455530
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-
note
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The halo aldols 2,4-syn-4,5-syn (4a or 6a) and 2,4-anti-4,5-syn (5a or 7a) were the only diastereomers observed in the reaction mixtures.
-
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55
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41449100799
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For the biradical character of some titanium(IV) enolates, see
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Unpublished results from Lorente, A. Máster Experimental, Universitat de Barcelona, 2009.
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Unpublished results from Lorente, A. Máster Experimental, Universitat de Barcelona, 2009.
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57
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64349108339
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The influence of Ti - Lewis acids on the aldol reactions of tert-butyl hydroxyacetate has been reported; see
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