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Abstract
Amino acid isothiocyanate derivatives have been used in GC/MS analysis. The best method providing these derivatives is decomposition of carboalkoxydithiocarbamates. Analysis by gas chromatography and mass spectrometry has shown that carbon oxysulfide, methanol, ethanol, amino acid ester isothiocyanate and trace carbon disulfide are pyrolysis products of amino acid ester carboalkoxydithiocarbamates. However, isothermal pyrolysis at 200° and direct MS analysis, FI and EI ionization modes, give rise to a few more by-products with m/z 145 and 177. This suggests a stepwise mechanism of thermal decomposition of the compounds studied. The number of by-products was seen to decrease when the R and R moieties were identical.