1416319-93-1Relevant articles and documents
Umpolung by N-heterocyclic carbenes: Generation and reactivity of the elusive 2,2-diamino enols (breslow intermediates)
Berkessel, Albrecht,Elfert, Silvia,Yatham, V. Reddy,Neud?rfl, J?rg-M.,Schl?rer, Nils E.,Teles, J. Henrique
supporting information, p. 12370 - 12374 (2013/02/23)
54 years later: Saturated imidazolidin-2-ylidenes react with aldehydes to smoothly produce the elusive 2,2-diamino enols A ( Breslow intermediates , first postulated in 1958) of carbene-catalyzed umpolung reactions. The 2,2-diamino enols A react with additional aldehyde in a cross-benzoin reaction. The methylated Breslow intermediates B are accessible by deprotonation of methoxymethyl azolium salts. Copyright