Reaction chromatography. I. Gas-liquid/thin-layer chromatographic derivatization technique for the identification of carbonyl compounds

A technique for identifying small quantities of carbonyl compounds present in essential oils is described. These compounds are derivatized on thin-layer plates as they are eluted from the exhaust port of a gas chromatograph. Subsequently, they may be examined by thin-layer chromatography, gas-liquid chromatography, paper chromatography, or several other methods for confirmation of identity. 2,4-Dinitrophenylhydrazones, p-nitrophenylhydrazones, and 2,4-dinitrophenylsemicarbazides were utilized in this study, and thin-layer chromatographic data are given for each. In addition, melting points are listed for some previously unreported 2,4-dinitrophenylsemicarbazides.