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Chromatography of benzothiazoles

Authors
Journal
Journal of Chromatography A
0021-9673
Publisher
Elsevier
Publication Date
Volume
170
Issue
1
Identifiers
DOI: 10.1016/s0021-9673(00)84239-9

Abstract

Abstract Thin-layer chromatography (TLC) of some 2-alkyl-, 2-aryl- and 2,2′-bis-benzothiazoles has been examined to develop analytical procedures and to determine the influence of substituents. No simple relationship was found for the R M values of the 2-alkyl derivatives but the R M values of the 2,2′-bis compounds showed linear behaviour, indicative of mixed partition-absorption and pure partition separation, respectively. Δ R M values were calculated for the compounds and shown to be characteristic of structural features. Gas-liquid chromatographic (GLC) behaviour was studied on SE-30 and Carbowax 20M columns. In this case both 2-alkyl- and 2,2′-bis-benzothiazoles show exponential relationships between retention times and carbon chain length of substituents. The calculated TLC and GLC relationships can provide a basis for the identification of components of reaction mixtures of benzothiazoles.

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