Dissolve the isolated product in an appropriate solvent (e.g., dichloromethane). Add a sulfating agent (e.g., sulfur trioxide or sulfuric acid) to the solution to sulfonate the product. This step will introduce a chiral sulfonyl group to one enantiomer, making it separable from the other.
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(R)-2-Acetoxy-3-phenylpropionsaeure-methylester
n-Butylsulfate
