Abstract
Abstract Although benzoyl isocyanates do not react with benzaldazines at room temperature, the criss-cross cycloadducts are formed if the reaction is carried out in refluxing xylene. On the other hand, thiobenzoyl isocyanate behaves quite differently toward the same azines. It reacts easily with azines at room temperature to afford to mono- or the bis(4+2) cycloadducts depending on the nature of the substituent in the azines. We found that the mono (4+2) cycloadduct can be thermally dissociated into its components. Neither benzoyl isocyanate nor thiobenzoyl isocyanate react with aromatic ketazines.
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