abstract |
A process for preparing an optically active 4-halogeno-1,3-butanediolnand (R)-1,2,4-butanetriol or (S)-3-hydroxy-γ-butyrolactonenwhich comprises reacting a racemicn4-halogeno-1,3-butanediol with a specific microorganismnbelonging to the genus Pseudomonas. |