827342-30-3Relevant academic research and scientific papers
Terminal zirconium imides prepared by reductive C-N bond cleavage
Basuli, Falguni,Kilgore, Uriah J.,Brown, Douglas,Huffman, John C.,Mindiola, Daniel J.
, p. 6166 - 6175 (2008/10/09)
Toluene reflux of ZrCL4 with Li(Nacnac) (Nacnac- = [Ar]NC(tBu)CHC(tBu)N[Ar], Ar = 2,6-[CH(CH3)2] 2C6H3) provides the complex (Nacnac)ZrCl 3 in 75% yield. Cl- substitution for OTf- is readily achieved with 3 equiv of AgOTf to yield 77% of the complex (Nacnac)Zr(OTf)2(η2-OTf). The coordination mode of the three triflato groups was determined by a combination of single-crystal X-ray analysis and 19F COSY experiments. Addition of 2 equiv of LiCH 2XMe3 (X = C, Si) to (Nacnac)ZrCl4 in Et 2O affords the bis(alkyl) systems (Nacnac)Zr(CH2XMe 3)2Cl in good yield (X = C, 86%; X = Si, 91%). In contrast, reaction of (Nacnac)Zr(OTf)2(η2-OTf) with 2 equiv of LiCH2CMe3 leads instead to formation of the terminal zirconium-imido complex [(NactBu)Zr=NAr(μ2-OTf)] 2 (NactBu- = [2,6-(CHMe2)2C 6H3]NC(tBu)CHC(tBu)). Likewise, reduction of (Nacnac)ZrCl3 with 2 equiv of KC8 in THF also affords a terminal zirconium-imido species, (NactBu)Zr=NAr(Cl)(THF). The zirconium-imido compounds described herein result from reductive cleavage of the C-N bond of the imine functionality contained in the Nacnac- ligand. The complexes (Nacnac)ZrCl3, (Nacnac)Zr(OTf)2(η2-OTf), (Nacnac)Zr(CH2XMe3)2Cl, [(NactBu)Zr= NAr(μ2-OTf)]2, and (NactBu)Zr=NAr(Cl)(THF) have been fully characterized, and a single-crystal X-ray diffraction analysis is reported for each.
