Abstract
Abstract Mesoionic 5-iminothiazoles were prepared by the cyclization of N-thiobenzoyl-methylaminoacetonitriles with hydrogen chloride or acyl chlorides. The reaction between a 5-aminothiazolium chloride and acyl chlorides, isocyanate, sulfonyl chloride, and nitrous acid gave the corresponding N-substituted mesoionic 5-iminothiazole derivatives. The spectral data of these compounds as well as the ready bromination of the ring support the view that this ring system is aromatic.
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