Due to the difficulty in preparation, little work had previously been reported on imidoylguanidines. In the present study, however, it was found that they could beprepared by the reaction of imidates with guanidine. Thus, aromatic imidates readily reacted with free guanidine in ethanol at room temperature to give the corresponding imidoylguanidines in a good yield . On the other hand, aliphatic imidates were less reactive and unstable, and only a few aliphatic imidoylguanidines were obtained in a poor yield. Some chemical properties of those compounds were also examined.
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