title: Characterization of reaction products formed during thin-layer chromatographic detection of thiocarbamate herbicides.
abstract: The reaction between thiocarbamate herbicides and 2,6-dichlorobenzoquinone-N-chloroimine or 2,6-dibromobenzoquinone-N-chloroimine is suitable for the detection of these herbicides on thin-layer plates with high sensitivity. The reactions were followed by infrared, nuclear magnetic resonance and mass spectrometry. We have established the formation of 2,6-dichlorobenzoquinone-S-alkyl sulphenylimines. In the case of the bromo-derivative, halogen exchange and substitution on the quinone ring took place simultaneously leading to the formation of mixed halogenated 2,6-dihalo- and, in addition, 2,3,6-trihalobenzoquinone-S-alkyl sulphenylimines. The final product of the detection reaction, i.e. 2,6-dichlorobenzoquinone-S-alkyl sulphenylimine was reacted with 2,6-dibromobenzoquinone-N-chloroimine where 2,6-dichloro-3-bromobenzoquinone-S-alkyl sulphenylimine formed as a consequence of the looser bromine-carbon linkage on the 2 and 6 positions of the quinone ring.
authors.affiliation: Research Institute for Solid State Physics of the Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary.
authors.forename: K
authors.initials: K
authors.lastname: Fodor-Csorba
authors.forename: S
authors.initials: S
authors.lastname: Holly
authors.forename: A
authors.initials: A
authors.lastname: Neszmélyi
authors.forename: G
authors.initials: G
authors.lastname: Bujtás