RadioactiveD-lysine supplied toTriglochin maritimaL. shoots can be utilized without configuration inversion. The pipecolic acid is the most radioactive compound. It would be synthetized via the alpha;-ceto-epsiv;-aminocaproiuml;c acid.In the plant,L-lysine can be partly converted intoD-lysine; however, the data obtained in the presence ofL-3H1-lysine suggest the possibility of a direct transformation of theL-isomer into pipecolic acid via the adipic semialdehyde.In all cases, the labelled pipecolic acid is theL-enantiomer that is more radioactive in presence of sodium chloride.
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