DL‐threo‐α‐Hydroxy‐β‐aminobutyric acid was synthesized stereospecifically by reaction of cis‐αβ‐epoxybutyric acid with benzylamine and catalytic hydrogenolysis of the N‐benzyl derivative. cis‐Crotonic acid was obtained in quantitative yield by reduction of tetrolic acid with a palladium on barium sulphate catalyst poisoned with quinoline.
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Liwschitz et al. (1963) studied this question.
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