1-Butyl-2,3-bis(dicyclohexylamino)cyclopropenimine

Cyclopropenimines are a highly effective new class of Br?nsted base catalysts, the so-called “superbases” for organocatalysis. Due to the prevalence of chemical reactions involving proton transfer as a key mechanistic event, Br?nsted bases have become indispensable tools for the practice of organic synthetic chemistry. This is one of a suite of Br?nsted catalysts reported by Tristan Lambert and co-workers available through Sigma-Aldrich.