The rate constants for three competing processes at the chiral center in the acid‐catalyzed racemization of both (R)‐ and (S)‐1‐phenylethanol in 18O‐enriched water are determined: oxygen exchange without inversion (5.9 ±0.6), inversion without oxygen exchange (4.1 ±0.2), and oxygen exchange with inversion (7.6 ±0.7, all · 10‐4 M‐1 s‐1.
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