| 摘要 |
PROBLEM TO BE SOLVED: To obtain 2-hydroxy-4-methylthiobutanoic acid from 2-hydroxy-4- methylthiobutanonitrile by a discoloration-suppressive method. SOLUTION: This 2-hydroxy-4-methylthiobutanoic acid is obtained by hydration reaction of 2-hydroxy-4-methylthiobutanenitrile to form 2-hydroxy-4- methylthiobutanamide which, in turn, is hydrolyzed, wherein the hydration reaction and/or hydrolysis is carried out in the presence of formaldehyde.
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