Bis(imino)pyridine Ligand Deprotonation Promoted by a Transient Iron Amide

• Published in: Inorganic chemistry Vol. 45; no. 1; pp. 2 - 4
• Main Authors: Bouwkamp, Marco W, Lobkovsky, Emil, Chirik, Paul J
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 09.01.2006
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/ic051839o

Addition of 2 equiv of LiNMe2 to the bis(imino)pyridine ferrous dichloride, ( i PrPDI)FeCl2 ( i PrPDI = (2,6- i Pr2−C6H3NCMe)2C5H3N), resulted in deprotonation of the chelate methyl groups, yielding the bis(enamide)pyridine iron dimethylamine adduct, ( i PrPDEA)Fe(NHMe2) ( i PrPDEA = (2,6- i Pr2−C6H3NCCH2)2C5H3N). Performing a similar procedure with KN(SiMe3)2 in THF solution afforded the corresponding bis(THF) adduct, ( i PrPDEA)Fe(THF)2. ( i PrPDEA)Fe(NHMe2) has also been prepared by addition of the free amine to the iron dialkyl complex, ( i PrPDI)Fe(CH2SiMe3)2, implicating formation of a transient iron amide that is sufficiently basic to deprotonate the bis(imino)pyridine methyl groups. Deprotonation of the amine ligand in ( i PrPDEA)Fe(NHMe2) has been accomplished by addition of amide bases to afford the ferrous amide-ate complexes, [( i PrPDEA)Fe(μ-NMe2)M] (M = Li, K).