Twenty four 2‐Aryl‐Δ‐2‐1,3,4‐oxadiazoline‐5‐thione derivatives 2 were synthesized and their uv and ir spectra were studied. Correlation between σ‐Hammett constants of aryl substituents and the differences in absorption maxima (Δv = v1‐v2 in kK) of the electronic spectra of the deprotonated species were also evaluated. A new method for the synthesis of the 2‐(amino)aryl derivatives 2v,w,x is also reported.
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Charistos et al. (1994) studied this question.
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