Gc/ms characterization of monosubstituted hydrazones of glyoxylic acid ethyl ester
T12N4
K.I. Rotaru, I.G. Zenkevich, R.R. Kostikov
Electron ionization mass spectra and gas chromatographic retention indices of a series of newly synthesized N-monosubstituted (alkyl, aryl, allyl) hydrazones of glyoxylic acid ethyl ester RNHN=CHCO2C2H5 were considered. It was shown the hydrazones were partially converted into isomeric (ethoxycarbonyl)methyl diimides during their GC separation (mostly in the heated injector port of a gas chromatograph). The retention indices of these diimides are less than those of initial hydrazones for 268 ± 26 i.u. Most remarkable feature of these isomers appeared to be high identity of their mass spectra due to similar rearrangements in molecular ions.
