Die Darstellung von N‐Acylcarbodiimiden wird beschrieben, ihr Reaktionsverhalten gegenüber Aminen sowie Hydrazinderivaten geprüft; die Strukturen der entstandenen Verbindungen werden durch unabhängige Synthesen gesichert.
The reaction of N-benzoyl-N-t-butylthiourea with either diethyl azodicarboxylate or azodibenzoyl resulted in the formation of benzoyl-t-butylcarbodiimide in 84% and 48% yields, respectively. Dehydrosulfurization of various thioureas was also effected with mercuribenzamide. Benzoyl- or ethoxycarbonylcarbodiimides were obtained in over 80% yields. The reaction of benzoyl-t-butylcarbodiimide with one equivalent each of N-benzoylglycine and glycine ethyl ester led to the formation of N1-benzoyl-N2-t-butyl-N3-(ethoxycarbonyl)methylguanidine in a good yield, no N-benzoylglycylglycine ethyl ester being isolated. When benzoyW-butylcarbodiimide was allowed to react with benzoic acid, dibenzimide and t-butyl isocyanate were formed. Similarly, N-ethoxycarbonylbenzamide and N-benzoylglycine(N′-ethoxycarbonyl)amide were prepared in good yields.