Sulfuric Acid → 3-Phenyllactic acid, (S)-

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L-Phenylalanine (10.00 g, 60.5 mmol) was added to a dilution of 8.88 g (90.5 mmol) of concentrated sulfuric acid in 110 g of water and then, at an inside temperature of 0° C., a mixture of 10.45 g (151.5 mmol) of sodium nitrite and 20 g of water was added over 5 hours. After addition, the mixture was further stirred at 0° C. for 20 hours and, thereafter, the same work-up procedure as in Example 1 was followed. The combined extract (113.7 g) obtained contained 7.0 g of (2S)-2-hydroxy-3-phenylpropionic acid (yield 70%, optical purity 96.6% ee). The proton concentration (normality) in the reaction of this example was 1.7 mol/kg, the amount of the protonic acid was 3.0 equivalents (relative to L-phenylalanine) and the reaction temperature was 0° C.

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