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(R)-(+)-Paraconic acid 4, (S)-(-)-terebic acid 6 and their corresponding methyl and ethyl esters having ee's ranging from 60% to 92% were obtained by enzymatic resolution of their racemates. The enzymatic resolution of racemic ethyl γ-methylparaconates 14a and 14b allowed the isolation of the unreacted ester (2R,3R)-(+)-14a and that of the lactonic acid (2S,3R)-(-)-5b with 80% and 93% ee, respectively,...
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