The gas chromatographic behaviours of dulcin were investigated. From the results it became clear that dulcin was decomposed in injection port at higher temperature than which was identified to be p-phenetidine. The higher temperature of injection port, the more sharply appeared both peaks, and the subsidiary peak was increased. By on-column reaction with trifluoroacetic anhydride, the subsidiary peak shifted and the new peak of trifluoroacetophenetidine was observed. In case of the reaction

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... bis-(trimethylsilyl)-acetamide, the new peak of trimethylsilyl-p-phenetidine and two peaks of trimethylsilylated-dulcin appeared.