After the alkylation reaction, the chiral auxiliary can be removed. This is typically done under mild conditions, and the product of the reaction will retain the chirality introduced by the auxiliary.
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(S)-4-(2-Benzyloxy-ethyl)-2,2-dimethyl-[1,3]dioxan-5-one
Pentanoic acid, 4-[(1-phenylethyl)imino]-, methyl ester, (S)-
