Picryl isothiocyanate (4), prepared in a two‐step sequence from picryl chloride (2), reacts smoothly with alkyl azides to yield 4‐alkyl‐5‐picrylimino‐1,2,3,4‐thiatriazolines 5 which are stable below 100°. These adducts combine with isocyanates in a bimolecular process with loss of nitrogen, similar to the formation of phenylimino derivatives but different from that of sulfonyliminothiatriazolines.
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L'Abbá et al. (1990) studied this question.
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