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3 is necessary to remove the trifluoromethanesulfonic acid that is formed during the reaction.
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The isolated α-formyl adducts are generally stable at room temperature without significant racemization. 2-Phenyloctanal was isolated with 90% ee through direct purification by flash chromatography (see Supporting Information). Rechecking the enantiopurity of the 2-phenyloctanal after 3 weeks confirmed the initial 90% ee (i.e., no erosion in optical purity).
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