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The trapping of delocalized ester enolates with silylating agents has been reported to be troublesome. See: (a) Corset, J.; Promet, F.; Lautié, M. F.; Ratovelomana, N.; Seyden-Penne, J.; Strzalko, T.; Roux-Schmitt, M. C. J. Am. Chem. Soc. 1993, 115, 1684. (b) Solladié-Cavallo, A.; Csáky, A. G. J. Org. Chem. 1994, 59, 2585 and references cited therein.
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note
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Full retroaldolization was observed in an independent essay upon treatment of 8a with 1 M TBAF solution in THF at room temperature in 1 h.
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