Catalyst free direct addition of cyclic secondary amines to variousN,N′-bisaryl substituted carbodiimides led to the formation of bulky guanidines. Furthermore, two equivalents ofN,N′-bisaryl substituted carbodiimides upon treatment with piperazine led to the formation of bis guanidines.
无需催化剂,环状二级胺直接加成到各种N,N′-二芳基取代的碳二亚胺上,从而形成大体积的胍。此外,当两当量的N,N′-二芳基取代的碳二亚胺与哌嗪反应时,会形成双胍。